Open Bug 1550147 Opened 9 months ago Updated 5 months ago isn't sending any intermediate certificates


(Web Compatibility :: Desktop, defect, P5)

Firefox 66


(Not tracked)



(Reporter: github, Unassigned)





(1 file)

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:66.0) Gecko/20100101 Firefox/66.0

Steps to reproduce:

browse to

Actual results:


looks like COMODO RSA cert chain is not recognized. (see screenshot)

Expected results:

page loads.

worth noting that i tried in chrome and it works as expected, so i'm assuming it's not that the CA chain isn't being sent. (like other bug reports mention)

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:66.0) Gecko/20100101 Firefox/66.0

Attachment 9063602 [details] shows If I try to load that, seemingly no content loads. Browser Console shows the server responds with 404 Not Found but the address bar icon doesn't show any certificate issues. fails to load with no error code and no Advanced button to reveal it. In Nightly, the error code is PR_CONNECT_RESET_ERROR. Same thing in Vivaldi: error code ERR_CONNECTION_RESET, so this appears to be a site problem.

Component: Untriaged → Security: PSM
Product: Firefox → Core

It's not sending any intermediate certificates:
Firefox will handle this situation better once bug 1548365 ships, but in the meantime this can be an evangelism bug (they need to fix their server).

Component: Security: PSM → Desktop
Product: Core → Web Compatibility
Summary: ssl cert error SEC_ERROR_UNKNOWN_ISSUER on for cert issued by comodo rsa → isn't sending any intermediate certificates
Version: 66 Branch → Firefox 66
Priority: -- → P5
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