Connection is untrusted puzzle

[Jim Byrnes]

I just tried to access a financial site on 12.04 using Firefox 17.0.1 - 
Canonical - 1.0 and was told the connection was untrusted because:

not-its-real-name.com uses an invalid security certificate.

The certificate is not trusted because no issuer chain was provided.

(Error code: sec_error_unknown_issuer)


On the same desktop machine running 10.04 using Firefox 17.0.1 - 
manually installed I get no warning and can connect as usual.

On my laptop running 12.04 - Firefox 17.0.1 - Canonical - 1.0 I get no 
warning and can connect as usual.

I have compared the Security and Encryption settings between the 3 
machines and see no differences.  The certificate is from GeoTrust if 
that makes a difference.

Anyone have any ideas where to look to fix this?

Thanks,  Jim