I have configured an OCS (Office Communication Server)2007 Server in our organization and its working fine in the local environment. While I am trying to login through the OCS client I can login to OCS server and can access all the features of OCS Server. But while I am trying to login externally from another network it provide me an error for the Certificate. The error is like “There was a problem verifying the certificate from the server. Please contact your system administrator”. So please suggest for the same so that I can login to the OCS server externally.