Here's my problem. I have the certificates from GeoTrust.
I have the .csr file that i sent to them to get the .crt file. I have also the .cer file.

The problem is that i cannot install this certificate into my Zimbra server.
I have the files:
- commercial.crt
- commercial.csr
- commercial_ca.crt which contains
- commercial.key and commercial.key.dec that i got from my previous installation of Zimbra (4.5.5) on which the certificate worked well.

I tried to follow many how-to to get it running, but i still get errors.

** Verifying /opt/zimbra/ssl/zimbra/commercial/commercial.crt against /opt/zimbra/ssl/zimbra/commercial/commercial.key
Certificate (/opt/zimbra/ssl/zimbra/commercial/commercial.crt) and private key (/opt/zimbra/ssl/zimbra/commercial/commercial.key) match.
XXXXX ERROR: Invalid Certificate: /opt/zimbra/ssl/zimbra/commercial/commercial.crt: /C=CN/ (c)07/OU=Domain Control Validated - QuickSSL(R)/
error 20 at 0 depth lookup:unable to get local issuer certificate