I have Exchange 2007 SP1 installation in my test lab. I have backup of the installation in "clear", just configured state. There are CAS and EDGE servers, edge subscriptions were tuned and checked before backup.The problem is that edge synchronization doesn't work after I played enough with installation and restored it to "clear" state.Event Type: ErrorEvent Source: MSExchange EdgeSyncEvent Category: Topology Event ID: 1024Date: 3/7/2008Time: 10:07:35 AMUser: N/AComputer: CAS01Description:The connection to the ADAM instance of the Edge Transport server failed with exception "The supplied credential is invalid.". This could be caused by a failure to resolve the Edge Transport server name edge02.domain.local in DNS, a failure when trying to connect to port 50636 on Edge Transport server edge02.domain.local, network connectivity issues, an invalid certificate, or an expired subscription. Verify the configurations of your network and server.Sure, I can re-create edge subscriptions and it will work again (actually, I did it ). But I'm interesting with a reasons of such behavior and with possibility to prevent the problem.Can I tune my installation such way that edge subscription is still working after restore (e.g. performed in a week after backup) ?Thanks in advance.