I need to change the FQDN of my computer in order to match it with certificate required for Communicator web Access. how do i can achieve this renaming of FQDN without un-istallation of CA. regards,

Hi, In the current situation, I suggest you apply a new certificate after changing the FQDN. At the same time, it seems the current issue is a Communicator Web Access issue. Please understand that we mainly discuss Exchange issues in this forum. You had better get help from Live Communications Server Community. Live Communications Server Community http://www.microsoft.com/technet/community/en-us/livecomm/default.mspx Hope your issue will be fixed soon. Thanks, Elvis