We are a group of five schools who run a single forest, multiple domain active directory. Each site has a forest root DC and two sub-domain DCs. We're testing a new Exchange 2010 deployment and I've installed three Exchange 2010 servers at each site (one for each role) similar to the setup described here http://www.msexchange.org/articles_tutorials/exchange-server-2010/high-availability-recovery/designing-site-resilient-exchange-2010-solution-part3.html. Currently we have two problems which I believe may be related. Managing the Exchange servers in other sites works fine except when viewing a server in EMC from another site you are initially presented with an error which reads:- Cannot connect to the remote procedure call on the server named SERVERNAME. Verify that a valid computer name was used and the Microsoft Exchange Service Host is started. It was running the command Get-ExchangeCertificate -Server 'SERVERNAME'. Running the above command from Powershell also fails. Running the command on a server in the same site is fine though. Also, when testing calendaring in OWA cross-site attendees are not being updated when they reply to a meeting invitation. Again, this works fine with same-site attendees which is why I'm thinking these are both symptoms of the same problem. Sites, subnets etc. are all configured and there's no problem with AD replication. We sit on a County-level WAN which so there are no firewalls between schools. Any help would be appreciated.

Could you try: Get-ExchangeCertificate -Server FQDN, for instance mbx.subdomain.domain.com? If this works, take a look at Append these DNS suffixes (in order) IPv4 and IPv6 Advanced DNS Tab http://technet.microsoft.com/en-us/library/cc754143.aspxMCTS: Messaging | MCSE: S+M