dear, it there any guide about install ssl certificate on cluster exchange server, do i need two ssl cert if there is two nodes on one cluster?

Usually you would include all names required in one certificate. Then export and install same cert on each Exchange node.Tim Harrington | MVP: Exchange | MCITP: EMA 2007/2010, MCITP: Lync 2010, MCITP: Server 2008, MCTS: OCS | Blog: http://HowDoUC.blogspot.com | Twitter: @twharrington

Hi, You can try to issue a SAN certificate which include both two node FQDN. By the way, what is the version of your Exchange Server? CCR?Xiu Zhang TechNet Community Support