This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Natao arisiva ity resaka mitohy ity. Mametraha fanontaniana azafady raha mila fanampiana.

Avast Forum connection failed - works in Chrome etc.

  • 7 valiny
  • 18 manana an'ity olana ity
  • 13 views
  • Valiny farany nomen'i listeruk

more options

I'm trying to log in to the avast forum and get this error every time (not the first site for this to happen on either)...

Secure Connection Failed An error occurred during a connection to forum.avast.com. You have received an invalid certificate. Please contact the server administrator or email correspondent and give them the following information: Your certificate contains the same serial number as another certificate issued by the certificate authority. Please get a new certificate containing a unique serial number. (Error code: sec_error_reused_issuer_and_serial)

I can access it with Chrome, IE etc. so logically it must be a certificate stored in Firefox? I went to Options - Advanced - Certificates - View Certificates, but I'm lost from there.

I'm trying to log in to the avast forum and get this error every time (not the first site for this to happen on either)... Secure Connection Failed An error occurred during a connection to forum.avast.com. You have received an invalid certificate. Please contact the server administrator or email correspondent and give them the following information: Your certificate contains the same serial number as another certificate issued by the certificate authority. Please get a new certificate containing a unique serial number. (Error code: sec_error_reused_issuer_and_serial) I can access it with Chrome, IE etc. so logically it must be a certificate stored in Firefox? I went to Options - Advanced - Certificates - View Certificates, but I'm lost from there.

Vahaolana nofidina

Thanks Philipp, https scanning was the culprit!

Hamaky an'ity valiny ity @ sehatra 👍 2

All Replies (7)

more options

hello, please try to change the settings in the firefox menu ≡ > options > advanced > network > connection - settings... so that it is set up to directly connect to the internet ('no proxy').

more options

It was/is set to 'No Proxy'. The error still occurs. Thanks

update: after restarting and cleaning out history, cookies etc. suddenly it works. It did work once previously then the error came back again, so I will have to report back and see if it happens again.

update 2: Now I have the same message appearing on my homepage - https://www.google.co.uk/

Novain'i listeruk t@

more options

can you inspect the certificate on forum.avast.com and see who is the issuer?

Secure Website Certificate

more options

There is no certificate.

more options

ok, i suppose you are using avast as security product? if you have recently updated to avast 2015, disable the https scanning option within its settings...

more options

I tried disabling the avast web shield and it loads now.

more options

Vahaolana Nofidina

Thanks Philipp, https scanning was the culprit!