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"Did Not Connect: Potential Security Issue" on every sites

  • 4 回覆
  • 1 有這個問題
  • 830 次檢視
  • 最近回覆由 FredMcD

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Since yesterday I am getting this "Did Not Connect: Potential Security Issue" error on every sites that I have tried to visit. Even on well known secured sites like https://drive.google.com is inaccessible while my Chrome and Edge is working fine. Any solution?

Since yesterday I am getting this "Did Not Connect: Potential Security Issue" error on every sites that I have tried to visit. Even on well known secured sites like https://drive.google.com is inaccessible while my Chrome and Edge is working fine. Any solution?
附加的畫面擷圖

被選擇的解決方法

Hi FredMcD, Thanks for your response. Unfortunately none of these solution is working out for me. I don not use any third party antivirus or internet security software except for windows defender. However, finally turns out that turning on "Automatic proxy configuration URL" under Setting>Network setting solves the issue. I am not sure whether this will cause any security threat or other malfunction or not.

從原來的回覆中察看解決方案 👍 0

所有回覆 (4)

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  • MOZILLA_PKIX_ERROR_MITM_DETECTED
  • uses an invalid security certificate SSL_ERROR_BAD_CERT_DOMAIN
  • configured their website improperly

How to troubleshoot the error code "SEC_ERROR_UNKNOWN_ISSUER" on secure websites https://support.mozilla.org/en-US/kb/troubleshoot-SEC_ERROR_UNKNOWN_ISSUER


There is security software like Avast, Kaspersky, BitDefender and ESET that intercept secure connection certificates and send their own.

https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can

https://support.mozilla.org/en-US/kb/firefox-and-other-browsers-cant-load-websites

https://support.mozilla.org/en-US/kb/secure-connection-failed-firefox-did-not-connect

https://support.mozilla.org/en-US/kb/websites-dont-load-troubleshoot-and-fix-errors

What do the security warning codes mean

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選擇的解決方法

Hi FredMcD, Thanks for your response. Unfortunately none of these solution is working out for me. I don not use any third party antivirus or internet security software except for windows defender. However, finally turns out that turning on "Automatic proxy configuration URL" under Setting>Network setting solves the issue. I am not sure whether this will cause any security threat or other malfunction or not.

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You can check the connection settings.

  • Settings -> General -> Network: Connection -> Settings

If you do not need to use a proxy to connect to internet then try to select "No Proxy" if "Use the system proxy settings" or one of the others do not work properly.

See "Firefox connection settings":

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That was very good work. Well Done.