如何在Google Chrome中修復' err_ssl_version_or_cipher_mismatch”？

首先確認問題是否由網站自身引起，使用SSL Labs等工具檢測其TLS支持情況，若網站僅支持已棄用的TLS 1.0或1.1，則無法在現代Chrome中正常訪問；2. 更新Google Chrome至最新版本以確保支持TLS 1.2和1.3；3. 校正系統日期和時間，啟用自動時間同步以避免因時間偏差導致SSL驗證失敗；4. 清除系統的SSL狀態及瀏覽器緩存，在Windows中通過inetcpl.cpl清除SSL狀態，在macOS中通過Keychain Access刪除相關證書並清除Chrome緩存；5. 暫時禁用殺毒軟件或防火牆中的HTTPS掃描功能，如Avast、Kaspersky等可能使用過時加密方式攔截連接；6. 確保Chrome中啟用TLS 1.2和1.3，訪問chrome://flags/#ssl-version-min設為TLS 1.2，#ssl-version-max設為TLS 1.3，並啟用TLS 1.3實驗性功能；7. 對於Windows專業版或企業版用戶，檢查組策略gpedit.msc中的SSL配置設置，非專業版用戶可檢查註冊表HKEY_LOCAL_MACHINE路徑下SCHANNEL協議中TLS 1.2和1.3是否啟用，避免DisabledByDefault被設為1；8. 嘗試在其他瀏覽器或Chrome無痕模式下訪問，排除瀏覽器擴展干擾。綜上，該錯誤通常由本地環境問題引起，修復系統時間、更新軟件、正確配置TLS協議後可恢復正常安全連接。

The "ERR_SSL_VERSION_OR_CIPHER_MISMATCH" error in Google Chrome means your browser can't establish a secure connection to a website due to issues with SSL/TLS protocols or encryption methods. This usually happens when the server and browser can't agree on a common encryption standard. Here's how to fix it:

✅ 1. Check the Website First

Before troubleshooting your device, confirm the issue isn't on the website's end:

• Try accessing the site from another device or network.
• Use an online tool like SSL Labs' SSL Test to check if the site supports outdated or insecure protocols.
• If the site only supports old TLS versions (like TLS 1.0), it may not work with modern Chrome.

Note: Chrome dropped support for TLS 1.0 and 1.1 in recent versions. Sites still using them will show this error.

✅ 2. Update Google Chrome

An outdated browser may lack support for newer security protocols.

• Click three dots → Help → About Google Chrome .
• Let it check for updates and install them.
• Restart Chrome after updating.

Keeping Chrome up to date ensures compatibility with modern TLS versions (TLS 1.2 and 1.3).

✅ 3. Check Your System Date and Time

Incorrect system time breaks SSL verification.

• Right-click the clock → Adjust date/time → Turn on "Set time automatically" .
• Make sure the time zone is correct.

Even a few minutes' difference can cause SSL errors.

✅ 4. Clear SSL State and Cached Data

Your system may be caching outdated or corrupted SSL information.

On Windows:

• Press Win R , type inetcpl.cpl , and hit Enter.
• Go to the Content tab → Click Clear SSL state .
• Also, clear Chrome's cache: Ctrl Shift Del → Clear Cached images and files .

On macOS:

• Open Keychain Access → Search for the problematic site → Delete related certificates.
• Clear Chrome cache via chrome://settings/clearBrowserData .

✅ 5. Disable Outdated Security Software

Some antivirus programs (like Avast, AVG, or Kaspersky) intercept HTTPS traffic with their own SSL scanning.

• Temporarily disable the antivirus or firewall.
• Look for settings like "HTTPS scanning" , "SSL scanning" , or "Web Shield" and turn them off.

If the site loads after disabling, the AV is the culprit. Consider updating it or switching to one that supports modern TLS.

✅ 6. Enable TLS 1.2 and TLS 1.3 in Chrome

Chrome should enable these by default, but misconfigurations can disable them.

• In Chrome, go to:
  chrome://flags/#tls13-variant
• Make sure TLS 1.3 is Enabled .
• Also check:
  chrome://flags/#ssl-version-max → Should be TLS 1.3
  chrome://flags/#ssl-version-min → Should be TLS 1.2

Restart Chrome after changes.

✅ 7. Check Group Policy or Registry Settings (Windows Pro/Enterprise)

If you're on a managed network or using Windows Pro:

• Misconfigured policies can disable modern TLS versions.
• Press Win R → Type gpedit.msc → Navigate to:
  Computer Configuration → Administrative Templates → Network → SSL Configuration Settings
• Ensure "SSL Cipher Suite Order" isn't forcing outdated protocols.

For non-Pro users, check the registry:

• Open regedit → Go to:
  HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols
• Ensure TLS 1.2 and 1.3 are enabled (no DisabledByDefault = 1).

⚠️ Caution: Editing the registry can break your system. Backup first.

✅ 8. Try Another Browser or Incognito Mode

• Test the site in Firefox or Edge.
• Open Chrome in Incognito Mode ( Ctrl Shift N ) to rule out extensions interfering.

If it works elsewhere, a Chrome extension (like a proxy or security tool) may be causing the issue.

Summary: Quick Checklist

• [ ] Update Chrome
• [ ] Fix system date/time
• [ ] Clear SSL cache
• [ ] Disable antivirus HTTPS scanning
• [ ] Ensure TLS 1.2/1.3 is enabled
• [ ] Test in incognito or another browser
• [ ] Check if the site supports modern TLS

Most cases are caused by outdated antivirus tools or system time errors . Rarely, the site itself is at fault. Fixing the local environment usually resolves it.

Basically, Chrome needs a secure handshake — if either side (you or the server) can't speak the same encryption "language", the connection fails.

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