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.

Avatar for Username

সহায়তা খুঁজুন

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.

আরও জানুন

এই থ্রেডটি সংরক্ষিত ছিল। যদি আপনি সাহায্য চান তাহলে অনুগ্রহ করে একটি নতুন প্রশ্ন জিজ্ঞাসা করুন

sec_error_unknown_issuer on my TB, but not on my workmates'

  • 1 উত্তর
  • 1 এই সমস্যাটি আছে
  • 13 দেখুন
  • শেষ জবাব দ্বারা Matt

kofkof
kofkof
more options

Hello,

My Thunderbird doesn't display images in html emails coming from my https website. Error console says:

www.mysite.com:443 uses an invalid security certificate. The certificate is not trusted because the issuer certificate is unknown (Error code : sec_error_unknown_issuer)

This si *my* Thunderbird, on Ubuntu. My workmates also use Thunderbird (but on Windows) and images display correctly...

Can anyone tell me what the problem is (or could be)? I'm not interested in fixing this only in my Thunderbird by installing something which is absent from a default installation. I'm curious as to why this happens, I'd like to know if there's something wrong with the certificate on my website (a Comodo PositiveSSL wildcard certificate from https://www.ssls.com/ssl-certificates/comodo-positivessl-wildcard)

Thanks in advance

Hello, My Thunderbird doesn't display images in html emails coming from my https website. Error console says: www.mysite.com:443 uses an invalid security certificate. The certificate is not trusted because the issuer certificate is unknown (Error code : sec_error_unknown_issuer) This si *my* Thunderbird, on Ubuntu. My workmates also use Thunderbird (but on Windows) and images display correctly... Can anyone tell me what the problem is (or could be)? I'm not interested in fixing this only in my Thunderbird by installing something which is absent from a default installation. I'm curious as to why this happens, I'd like to know if there's something wrong with the certificate on my website (a Comodo PositiveSSL wildcard certificate from https://www.ssls.com/ssl-certificates/comodo-positivessl-wildcard) Thanks in advance

All Replies (1)

Matt
Matt
  • Moderator
  • Top 10 Contributor
more options

when you get the error you should also get an option to view the SSL certificate. My guess is that somewhere in the chain of trust there is a missing link. Have you deleted any certifying authorities? in the certificate manager? Is the certificate presented the one you think it is?

One of the things we are seeing is anti virus products issuing their own top level certificate authority certificates so they can man in the middle hack SSL connections. Avast springs to mind.

These certificate just "appears in the connection when the anti virus tried to do the man in the middle. While your using a Linux distribution, a corporate environment says you probably have some sort of mail scanner as a requirement.