when accessing https site I get error:

Error code: sec_error_revoked_certificate.

Broswer: Firefox version: 3.0.1
Operating system: Windows Server 2003

how can i fix this error on my website?

you can see examle here:
sec_error_revoked_certificate

it says:
Secure Connection Failed

An error occured during a connection to www.example.com

Peer's Certificate has been revoked.

(Error Code: sec_error_revoked_certificate)

The page you are trying to view can not be shown because the authenticity of the received data could not be verified

Please contact the web site owners to inform them of this problem