Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

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
Solved Archived

Firefox doesn't recognize a certificate by Sectigo Ltd on certain Linux machines

info1972 replied
info1972

I try to open https://botcompany.de in Firefox 74.

On one Linux machine (Peppermint 10), it works fine.

On another Linux machine (Ubuntu 18.04), I get a certificate error (SEC_ERROR_UNKNOWN_ISSUER).

Where does this difference come from? I need my certificate to be recognized on all machines.

Thanks

I try to open https://botcompany.de in Firefox 74. On one Linux machine (Peppermint 10), it works fine. On another Linux machine (Ubuntu 18.04), I get a certificate error (SEC_ERROR_UNKNOWN_ISSUER). Where does this difference come from? I need my certificate to be recognized on all machines. Thanks

All Replies (1)

தீர்வு தேர்ந்தெடுக்கப்பட்டது

Hey guys, problem SOLVED.

I needed to put the full chain instead of just the certificate in my keystore (webserver is written in Java). Posting the crucial code here to help others:

cat privkey.pem fullchain.pem >priv-and-cert.pem openssl pkcs12 -export -out keystore.p12 -in priv-and-cert.pem -name mydomain.name