How to fix ERR_SSL_PROTOCOL_ERROR: Causes, diagnostics, and step-by-step troubleshooting

When we (1Byte) see ERR_SSL_PROTOCOL_ERROR in a support ticket, we treat it less like a “browser problem” and more like a failed negotiation between three parties: the browser, the network in the middle, and the website’s TLS configuration. That framing matters because the fastest fix depends on where the negotiation broke—on the endpoint, on the path, or at the origin.

From an operator’s perspective, TLS errors aren’t cosmetic. They interrupt sign-ins, payments, embedded widgets, API calls, and even internal admin panels. In other words, they hit revenue and productivity, not just “security.” The uncomfortable truth is that modern businesses run on encrypted traffic, and the scale is enormous: Gartner forecasts public cloud services end-user spending at $675.4 billion in 2024, which is one reason more workloads now sit behind TLS-terminating load balancers, CDNs, WAFs, and identity proxies.

In our own day-to-day hosting work, we most often trace ERR_SSL_PROTOCOL_ERROR to one of a handful of patterns: a certificate chain that’s technically “valid” but incomplete, a strict security header that forces HTTPS where the backend can’t comply, a proxy doing TLS interception badly, or a browser feature (QUIC, extensions, experimental flags) that collides with an unusual network path. The good news is that you can diagnose most of these without guesswork—if you move in the right order.

So we’ll do this like we do it internally: start with the quick client-side checks that cost minutes, then isolate browser/security conflicts, then prove or disprove a network/ISP issue, and only then go deep with handshake inspection and server-side remediation.

What ERR_SSL_PROTOCOL_ERROR means in plain terms

1. SSL and TLS handshake failure between browser and website server

At a high level, ERR_SSL_PROTOCOL_ERROR means the browser attempted to create an encrypted session and couldn’t complete the TLS handshake. That handshake is not a single “thing,” but a sequence: the client proposes parameters, the server chooses compatible parameters, certificates are presented and validated, and keys are derived so both sides can encrypt application data.

Under the hood, modern TLS is designed so that the client advertises supported versions and cryptographic options, the server replies with negotiated choices, and the handshake finishes only after both sides can authenticate and derive keys; the IETF’s TLS specification describes how the ClientHello and ServerHello determine the negotiated connection parameters in the current generation of TLS. In practice, that negotiation fails when something is malformed, blocked, rewritten, or incompatible.

Why this error feels “random” to users

From the user’s chair, it can seem unpredictable because many “invisible” layers sit between a browser tab and the origin server: corporate proxies, antivirus HTTPS scanning, Wi-Fi captive portals, DNS filtering, ISP “security” products, CDN edge nodes, and load balancers. Any one of those can alter, terminate, or block the handshake. When that happens, the browser doesn’t always get a neat explanation; it only knows the secure session didn’t form.

How we think about it at 1Byte

Operationally, we treat TLS as a contract. The browser expects a sane certificate chain, modern protocol support, correct hostname routing (SNI), and a coherent response on the HTTPS endpoint. If the server sends plaintext where TLS is expected, if an intermediary injects a substitute certificate without trust, or if the client’s clock makes every certificate look “expired,” the contract breaks and the browser refuses to proceed.

2. Common browser messages and related errors in Chrome, Firefox, and Edge

Although the root cause is “handshake failed,” browsers surface different symptoms:

• Chrome and Edge often show “This site can’t provide a secure connection” with ERR_SSL_PROTOCOL_ERROR, especially when the handshake fails early or the server speaks something other than TLS on the HTTPS endpoint.
• Firefox frequently frames the same class of problem as “Secure Connection Failed,” and you may see codes like SSL_ERROR_RX_RECORD_TOO_LONG, PR_END_OF_FILE_ERROR, or issuer/chain errors depending on what broke.
• In cipher/protocol negotiation failures, Chromium-family browsers may show ERR_SSL_VERSION_OR_CIPHER_MISMATCH, which is the browser’s way of saying it found no mutually acceptable set of protocol/cipher choices.

Our practical takeaway

We don’t chase the exact string first; we chase the category. If multiple browsers fail in roughly the same way, we lean server-side or network-side. If only one browser fails, we suspect local cache/state, extensions, experimental features, or security software interacting with that browser’s network stack.

Common causes of ERR_SSL_PROTOCOL_ERROR on user side and server side

1. User side causes like incorrect date and time, outdated browser or OS, and corrupted browser data

Client-side causes are deceptively powerful because certificate validation is time-sensitive and stateful. A wrong system clock can make a perfectly valid certificate appear “not yet valid” or “expired.” Meanwhile, old OS builds can lag in trusted root stores, and old browsers can lack compatibility with modern TLS deployments.

Where browser state bites

Corrupted cached assets usually don’t cause handshake failure, but cached security decisions can. For example, a saved HSTS policy forces HTTPS even when you try HTTP, and a stored certificate exception or stale session state can produce confusing “works in private window, fails in normal mode” behavior. In our incident notes, that pattern is one of the strongest signals to clear site data and security state before touching anything else.

Real-world example we’ve seen

A customer once reported that their admin portal “only fails on one laptop.” The server was fine; the laptop had a timezone drift after sleep/hibernation, and the certificate validity check failed until time sync corrected. That kind of issue is mundane, but it can look like a breach if you’re on-call at midnight.

2. Interference from antivirus, firewall, Chrome flags, extensions, QUIC, VPN, or proxy

Interference is the category we respect most, because it produces the most misleading evidence. Antivirus HTTPS scanning and corporate security appliances often perform TLS interception: they terminate TLS, inspect traffic, then re-encrypt it to the user with a substitute certificate. If that substitute certificate isn’t trusted by the browser (or if the interceptor is buggy), the handshake fails.

Extensions and experimental settings

Extensions can break TLS indirectly by altering requests, injecting scripts, enforcing custom DNS/DoH behaviors, or handling proxy settings. Chrome flags can do similar damage because flags aren’t “normal settings”—they can materially change transport and handshake behavior in ways many networks don’t tolerate.

VPNs and proxies as both cure and cause

A VPN can fix the problem by bypassing a hostile network path, but it can also introduce one: split tunneling, corporate VPN security inspection, or a proxy PAC file can all place a “new middle” between browser and origin. When we troubleshoot, we use VPN toggling as a diagnostic instrument, not as a permanent bandage unless policy requires it.

3. Server side causes like expired or misconfigured certificates, incomplete certificate chain, and deprecated protocols

Server-side causes dominate when many clients fail across devices and networks. The big ones are straightforward:

• Certificate mismatch (wrong hostname, missing SANs, wrong SNI routing).
• Expired certificate (often after a failed renewal job or DNS change that broke ACME validation).
• Incomplete certificate chain (the leaf is installed, but intermediates aren’t served correctly).
• TLS configuration that’s too old, too strict, or oddly constrained (no compatible overlap with modern browsers).

Chain issues are especially common on custom Nginx/Apache stacks and on load balancers where the operator uploads only the leaf cert. Sectigo’s guidance is blunt for a reason: it is essential to include all intermediate certificates along with the leaf (end-entity) certificate, otherwise many clients cannot build trust even if the certificate itself is “from a real CA.”

How to fix ERR_SSL_PROTOCOL_ERROR with quick user checks first

1. Confirm system date, time, and timezone are correct

Time correctness is the cheapest high-impact fix. Certificates are validated against “not before / not after” windows, and a drift can cause immediate failure.

What we do (fast path)

• Verify automatic time sync is enabled at the OS level, then force a sync.
• Confirm timezone is correct, especially after travel or dual-boot scenarios.
• Close the browser entirely and reopen it so fresh handshakes occur.

What to watch for

If time fixes the issue instantly, we usually stop there—because anything deeper is likely overengineering. On managed fleets, though, repeated drift can signal battery/firmware issues or MDM policies preventing proper sync.

2. Clear browser cache and cookies and retry the site

We’re not clearing cache because cache “contains TLS.” We’re clearing it to remove stale site state that can force redirects, pin a bad session, or replay a broken path. This is also how we test whether the issue is tied to a logged-in session cookie, an A/B test variant, or an extension that behaves differently per-profile.

A disciplined way to do it

• Try a private/incognito window first to avoid destroying your normal session.
• Repeat the visit in a fresh profile if private mode changes nothing.
• Remove site-specific data (cookies/storage) if you can identify the single domain at fault.

3. Clear SSL state on Windows and restart the browser

Windows keeps a TLS/SSL cache at the OS layer that Chromium-based browsers can rely on. Clearing it is a classic move when the browser seems to “remember” a broken secure session.

On Windows systems, use the system’s Internet Options to clear SSL state and then fully restart the browser (we mean quit, not just close a tab). This step is low-risk and often resolves stubborn failures after certificate renewals or network changes.

When it matters most

We reach for SSL state clearing when the site works on another device, the server configuration checks out, and the same Windows machine fails across multiple Chromium-based browsers. That constellation suggests the problem is below the browser UI layer.

4. Update the browser and operating system to current versions

Modern TLS is not optional anymore, and both browsers and OS components ship compatibility and trust-store updates that directly affect TLS outcomes. If you’re behind, you can lose cipher overlap, fail on certificate transparency requirements, or simply miss root/intermediate updates.

How we advise customers to do this safely

• Update the browser first, then retest, because it’s faster and reversible.
• Patch the OS next, since OS crypto libraries and trust stores often underpin multiple apps.
• Reboot afterward, because crypto providers and security agents may not fully reload until restart.

How to fix ERR_SSL_PROTOCOL_ERROR by removing browser and security conflicts

1. Turn off QUIC protocol in Chrome flags and restart Chrome

QUIC can be a performance win, but it also introduces a second transport path that some networks, proxies, and security products mishandle. When QUIC is blocked or partially supported, Chromium can behave as if “TLS is broken,” even though what’s actually broken is the transport path selection.

For a clean test in Chrome, follow Cisco’s guidance to set the Experimental QUIC protocol flag to Disabled, relaunch the browser, and retry the site. We recommend treating this as a diagnostic toggle: if it fixes the problem, you’ve proven a network-path conflict, not a bad certificate.

How we interpret the result

• If disabling QUIC fixes only a handful of sites, we suspect middleboxes or ISP filtering on that path.
• If disabling QUIC fixes “most of the web,” we start looking for firewall rules, VPN settings, or endpoint security rewriting UDP-based flows.
• If nothing changes, we revert the flag and move on; permanent workarounds should have a clear justification.

2. Disable extensions and Chrome flags to identify a conflicting add-on or setting

Extensions are powerful enough to alter requests, headers, DNS choices, and proxy behaviors. Flags are powerful enough to alter underlying protocol behavior. Either can create a situation where only one browser fails.

Our isolation workflow

• Disable all extensions, then test the site once to establish a baseline.
• Re-enable extensions in small batches, retesting after each batch.
• Reset flags to default if you have ever experimented with them (even “one time” changes can linger).

What we’re looking for

The signature of an extension/flag problem is repeatability: the failure happens in normal mode, disappears in a clean profile, and returns when a specific add-on is enabled. Once identified, removing the add-on is often better than “keeping it but hoping.” In production operations, hope is not a strategy we recommend.

3. Temporarily disable antivirus or firewall SSL scanning to test secure connection behavior

HTTPS scanning features effectively insert a TLS middlebox on your own machine. That can work—until it doesn’t. If the security product can’t keep up with modern TLS features, or if its root certificate isn’t trusted properly, handshakes fail.

How to test without being reckless

• Disconnect from risky browsing and test only the failing site while scanning is disabled.
• Re-enable protection immediately after the test so you’re not quietly changing your threat model for the rest of the day.
• Document the outcome, because the result determines whether you should adjust security settings or escalate to the vendor.

A strong signal from Firefox’s ecosystem

Mozilla’s support community has long documented cases where security tools “meddle with encrypted connections,” and one thread notes that antivirus HTTPS scanning can trigger failures until scanning is disabled, pointing users to workarounds for secure connection failures caused by HTTPS scanning in common security products.

How to fix ERR_SSL_PROTOCOL_ERROR when it happens on multiple devices and browsers

1. Use a VPN test to help confirm whether the issue is on the local network or ISP path

When several devices fail on the same network—phones, laptops, tablets—and multiple browsers all show TLS errors, we stop blaming the browser. At that point, the fastest diagnostic is a path change.

How we run the VPN test

• Enable a reputable VPN on one device and retest the same domain.
• Switch the device to cellular data (if possible) and retest without the VPN.
• Compare outcomes, because differences reveal where the break likely sits.

Interpreting what you learn

If VPN fixes the error, the origin is probably fine and your local path is suspect: ISP filtering, DNS rewriting, or a network security appliance. If VPN changes nothing, we lean back toward server-side or endpoint-side configuration issues.

2. Restart modem and router and consider factory reset when multiple devices are affected

We don’t love “turn it off and on again” as a punchline; we love it as a state reset. Consumer routers can accumulate broken DNS states, partial firewall rules, or flaky DPI behavior after firmware updates.

A measured approach

• Power-cycle modem and router (in that order), then wait for full link stabilization.
• Confirm DNS settings haven’t been hijacked or replaced by “security” resolvers you didn’t choose.
• Reserve factory reset for cases where other networks work fine and your router is the common factor.

3. Check for ISP security filtering policies that can break TLS connections and request disabling if applicable

Some ISPs bundle “advanced security” features that do DNS filtering or traffic inspection. Those can block domains, alter resolution, or present captive portal-like behaviors that collide with strict TLS expectations.

What we recommend asking your ISP

• Request confirmation of any enabled security filtering on your line or gateway.
• Ask whether the feature can be disabled (temporarily or permanently) for troubleshooting.
• Verify whether the ISP is doing content filtering at DNS, HTTP, or TLS layers.

4. Look for signs of TLS interception or hijacking when certificates do not appear normally

TLS interception isn’t always malicious; it’s often corporate policy. The problem is that it must be implemented correctly. If you inspect a certificate and the issuer is a local security product, a corporate gateway, or something you don’t recognize, the browser may refuse it.

To understand the mechanics, it helps to remember what many “security” tools do: they intercept encrypted connections and use their own certificates to protect the last mile to the client. That design only works when the substitute root is trusted and the interceptor behaves like a compliant TLS endpoint.

Red flags we treat seriously

• Unexpected certificate issuer names that don’t match the site’s normal CA.
• Errors that occur only on managed networks (office Wi-Fi) but not on home or cellular.
• Failures that disappear when VPN is enabled, because VPN can bypass interception points.

Advanced troubleshooting for persistent ERR_SSL_PROTOCOL_ERROR

1. Inspect the SSL and TLS handshake using browser developer tools Security or Network panels

Once quick fixes fail, we stop guessing and start observing. Chromium-based browsers provide a Security view that can show certificate details, origin security state, and mixed content warnings. That’s often enough to reveal “wrong certificate for this hostname” or “certificate chain missing intermediates” without touching the server.

Chrome’s DevTools documentation explains how to view certificate and origin details in the Security section, which is where we begin when a customer says “it’s my site” but the evidence is still unclear.

What to capture for escalation

• Screenshot the certificate subject/SANs and issuer chain as shown by the browser UI.
• Record whether the failure is on the main document request or only on a subresource origin.
• Export a HAR file if the page partially loads and you need to prove where it fails.

2. Check cipher suite compatibility when the browser and server have no overlap

Cipher overlap problems are rarer than they used to be, but they still happen in two places: legacy enterprise systems that never modernized, and “over-hardened” configurations that accidentally remove broadly compatible ciphers.

How we approach it without weakening security by accident

• Use an external TLS scanner (such as SSL Labs) to see what the server actually offers.
• Compare results against modern client expectations, especially on older mobile devices and embedded clients.
• Prefer server-side modernization over client-side downgrades whenever possible.

3. Clear HSTS settings for a domain in Chrome and treat HSTS bypass as a last resort

HSTS can turn a “minor” TLS misconfiguration into a hard outage for returning users, because it forces HTTPS and can block user click-through on certificate errors. In plain terms, once the browser learns “this host must be HTTPS,” it becomes stubborn by design.

Chromium’s own documentation notes that Chrome maintains an HSTS Preload List and also stores dynamic HSTS rules learned from headers, and it describes how you can examine these rules using internal tooling. We use HSTS clearing only as a diagnostic step, because the real fix should happen on the server (or the domain should never have advertised HSTS in the first place).

When we consider HSTS clearing appropriate

• A development hostname accidentally received HSTS and now forces HTTPS to a non-TLS dev server.
• A subdomain was migrated, but HSTS was set too broadly and now breaks legacy endpoints.
• A temporary certificate issue is already fixed server-side, but the browser persists in enforcing old rules.

4. Adjust Windows Internet Options security level or temporarily enable additional SSL and TLS versions for testing

We’re cautious here because “enabling legacy protocols” can be a security regression. Still, in tightly controlled environments, temporarily toggling protocol support can prove whether you’re dealing with an incompatibility versus a certificate/chain problem.

Microsoft documents how administrators can enable or disable TLS protocols in Internet Options for troubleshooting and compatibility management. Our position is simple: use this for diagnosis, not as the “fix,” unless you’re remediating a legacy app on a segmented network with explicit risk acceptance.

Safer alternatives we prefer

• Modernize the server’s TLS configuration so current clients work without downgrades.
• Put a modern TLS-terminating proxy in front of the legacy service to bridge compatibility.
• Replace or retire endpoints that require insecure legacy protocols.

5. Mobile specific checks like clearing app cache and reviewing Wi Fi or cellular network settings

On mobile, the browser is only part of the equation. The OS certificate store, private DNS settings, content filters, and VPN profiles can all affect TLS. A site that fails on Wi‑Fi but works on cellular is a strong hint that the local network is injecting something into the path.

Our mobile checklist

• Clear the browser/app cache (or the in-app webview cache if the issue is inside another app).
• Toggle Wi‑Fi off and test via cellular to isolate the network path.
• Disable iCloud Private Relay / Private DNS / VPN profiles temporarily to test baseline behavior.

Website owner checklist to eliminate ERR_SSL_PROTOCOL_ERROR at the source

1. Verify SSL certificate is valid, not expired, and correctly installed

If you own the website, start by verifying what you are actually serving at the edge. Many teams renew a certificate “somewhere,” but the load balancer or CDN continues serving an older artifact, or the wrong certificate is attached to the listener that your users hit.

What we validate first

• Hostname match (CN/SAN coverage for apex and www as applicable).
• Correct certificate attached at the true TLS termination point (CDN/WAF/LB, not only the origin).
• Consistent behavior across regions/POPs if a CDN is involved.

2. Install the full certificate chain including intermediate certificates

Chain completeness is not optional. Some clients will fetch missing intermediates; others will not, and the failures can look “random” by device or network.

How we harden against chain mistakes

• Install the CA-provided bundle (leaf plus intermediates) exactly as instructed for your server type.
• Retest after every renewal, because renewals can change intermediate requirements.
• Scan externally from multiple vantage points, not just from inside your own network.

3. Enable modern TLS versions and configure secure cipher suites on the web server

Protocol support needs to meet modern browser expectations, and cipher configuration needs to avoid both extremes: outdated suites that are rejected, and ultra-strict suites that accidentally exclude real clients. We prefer configurations based on widely reviewed baselines.

NIST summarizes the purpose cleanly: TLS protocols were created to provide authentication, confidentiality, and data integrity protection between a client and server, and that mission only holds when implementations and configurations are current.

Operator advice we stand behind

• Use a reputable baseline (Mozilla guidelines, NIST guidance, or your CDN’s recommended profile).
• Upgrade TLS libraries and web servers before you tweak ciphers by hand.
• Prefer configuration generators and tested presets over custom cipher lists unless you have a clear compliance need.

4. Fix HSTS misconfiguration and use cautious max age values during testing

HSTS is powerful precisely because it removes user choice in unsafe situations. That’s wonderful for security and terrible for sloppy rollouts. A misconfigured HSTS policy can lock users into HTTPS on hosts that can’t actually serve HTTPS correctly.

Both the standards and the documentation emphasize that user agents should prevent click-through behavior; RFC guidance explicitly calls for user agents to prevent users from clicking through security warnings under strict transport rules, which is why “just bypass it” often isn’t available when HSTS is in play.

How we roll HSTS out safely

• Start with a short max-age in early testing, then increase gradually once you’re confident.
• Avoid includeSubDomains until every subdomain is confirmed HTTPS-capable.
• Delay preload submissions until your HTTPS posture is genuinely permanent.

5. Verify DNS records and confirm domain resolution matches the certificate domain

DNS mistakes create some of the most confusing TLS failures because the “wrong” server can present a perfectly valid certificate—just not for your domain. After migrations, it’s common to see stale A/AAAA records pointing to old infrastructure that still answers on the HTTPS port.

What we check in hosting migrations

• Confirm the apex and www records resolve to the intended front door (CDN/LB).
• Validate that redirects are consistent (HTTP to HTTPS, apex to www or vice versa).
• Ensure the certificate covers the final hostname after redirects, not only the starting URL.

6. Keep server software and SSL libraries updated

Even a correct certificate can fail if your TLS stack is outdated, buggy, or missing security updates. In our experience, “it worked last month” often maps to a browser update that removed compatibility with something legacy on the server side.

A maintenance stance that reduces surprises

• Patch OpenSSL (or your platform TLS library) on a predictable schedule.
• Upgrade Nginx/Apache/HAProxy with security releases, not only feature releases.
• Retest TLS posture after major dependency upgrades, CDNs changes, or WAF policy updates.

How 1Byte supports secure sites and helps prevent ERR_SSL_PROTOCOL_ERROR

1. Domain registration and DNS setup to keep certificates aligned with the correct hostnames

In our hosting practice, we treat DNS as part of security, not just “plumbing.” Misaligned DNS is how customers accidentally serve the wrong certificate, break ACME renewals, or route traffic to legacy endpoints that still respond but shouldn’t.

What we standardize

• Clear hostname inventory (apex, www, app subdomains, API subdomains) so certificates cover reality.
• Controlled DNS changes with rollback, especially during migrations.
• Validation of where TLS terminates so certificates are installed at the correct layer.

2. SSL certificates to enable HTTPS and maintain a trusted secure connection

Certificates are not “set and forget,” even with automation. Renewals fail. Chains change. Intermediate bundles get updated. Meanwhile, security headers and redirects can turn small mistakes into hard lockouts.

How we reduce certificate-driven outages

• Automated renewal where possible, plus monitoring for expiry and chain health.
• Post-renewal verification from outside the origin network to catch edge/CDN mismatches.
• Support workflows that focus on root cause (chain, SNI routing, termination point), not just “reinstall it.”

3. WordPress hosting, shared hosting, cloud hosting, and cloud servers backed by an AWS Partner

We’ve learned the hard way that TLS reliability is as much about platform design as it is about certificates. WordPress stacks often fail because of plugin-driven redirects and mixed configuration drift. Shared hosting can fail when customers inherit defaults they don’t understand. Cloud servers can fail when a reverse proxy, WAF, or load balancer is configured without full-chain awareness.

On the cloud side, we align our architecture with the same operational expectations you see in mature partner ecosystems; AWS describes partner programs as programs to build, market, sell, and grow your business with AWS, and we borrow that mindset: standardized patterns, repeatable automation, and observability around certificate health and TLS posture.

Where this shows up in real operations

• We prefer TLS termination points that are observable and auditable, not mysterious black boxes.
• We push customers toward automation and monitoring, because manual renewals fail at the worst times.
• We treat security headers (HSTS especially) as staged rollouts, not instant “turn it to maximum” toggles.

Conclusion and prevention checklist to reduce ERR_SSL_PROTOCOL_ERROR recurrences

1. Maintain updated browsers and operating systems and periodically clear saved browser data

Reliability starts with compatibility. Keeping browsers and OS components current reduces the odds of protocol overlap failures and trust-store weirdness. Periodic cleanup of site data can also prevent sticky states from masquerading as “TLS outages,” especially after site migrations and certificate rotations.

Our prevention habit

• Schedule update windows instead of letting updates happen only when something breaks.
• Use private windows as a quick A/B test before deleting primary profile data.
• Clear OS SSL state when Chromium browsers behave inconsistently across sites.

2. Use security tools that do not overblock SSL and TLS connections and audit extensions and flags

Security tools should improve security without becoming the cause of outages. If HTTPS scanning or TLS interception is required, it must be implemented with correct trust roots and modern TLS support. Extensions and flags deserve similar scrutiny: they are code running in the most privileged part of your browsing workflow.

A practical operating rule

• Prefer fewer extensions, installed deliberately, with periodic permission reviews.
• Reset experimental flags unless you can explain why each one is enabled.
• Test QUIC toggles only as diagnosis, then standardize the setting via policy if required in managed environments.

3. Automate certificate renewals, test SSL configuration regularly, and escalate to hosting provider or ISP when needed

On the website-owner side, the best fix is the one your users never notice: automated renewals with monitoring, full-chain correctness, modern TLS posture, and staged deployment of HSTS. On the user side, the best escalation is evidence-based: once you’ve proven it’s network-path dependent, bring that proof to your ISP; once you’ve proven it’s server-dependent, bring it to your host.

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Next step we recommend

If you’re seeing ERR_SSL_PROTOCOL_ERROR today, can you reproduce it in a private window, then on a different network path (VPN or cellular), and finally capture the certificate details from the browser’s Security panel—so we can decide, together, whether to fix your device, your network, or your server?