OCS 2007 certificate error

Not sure since you did not specify which certificate error you are getting, but my guess is that you may have generated a self-signed certificate that needs to be deployed to your clients as a root certificates via GPO:
http://technet.microsoft.com/en-us/library/cc738131%28WS.10%29.aspx

Otherwise, make sure that you are entering the name the same way it is in the certificate (server1 and server1.domain.com are not the same thing).

Please mention the error for further assistance

"There was problem verifing the certificate from the server ,Please contact to system administrator"

Is there a 'view details' or something to that effect?  See if you can get a little bit more details to make this more efficient, otherwise most certificate validation issues can be resolved from the steps in my article:

https://www.experts-exchange.com/articles/Networking/Protocols/Application_Protocols/SSL/Troubleshooting-Certificate-Error-Messages-on-Clients.html

If you're still having issues after going through that, please post an update, if possible include a screenshot.