Firefox and SSL: sec_error_unknown_issuer

firefoxssl

My client gets a sec_error_unknown_issuer error message when visiting https://mediant.ipmail.nl with Firefox.
I can't reproduce the error myself. I installed FF on a Vista and a XP machine and had no problems. FF on Ubuntu also works fine.

Does anyone get the same error and does anyone have some clues for me so I can tell my ISP to change some settings?
The certificate is a so called wild-card SSL certificate that works for all subdomains (*.ipmail.nl). Was I wrong to pick the cheapest one?

Best Solution

Just had the same problem with a Comodo Wildcard SSL cert. After reading the docs the solution is to ensure you include the certificate chain file they send you in your config i.e.

SSLCertificateChainFile /etc/ssl/crt/yourSERVERNAME.ca-bundle

Full details on Comodo site

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