Error seen while logging in after installing OCS and imported certificate

Hi all,
I have installed OCS and imported certificate on my machine. When logging on, I receive a message – "There was a problem verifying the certificate from the server. Please contact your system administrator".
This is worrying me a lot! I had manually configured the correct server using TLS authentication. Other users in domain can log on with no problems at all.
Am really digging my head.
Can anyone out there assist me please?
Thanks in advance.
