Hi Peter,
Have you inserted the CAS information to the DP?
Can you restore the database to an Exchange DR Database without any problem and 
export the mailbox from that database?

Also if you look for information how to show that Exchange find your Activity 
Directory in PowerShell correct should be good.

One last point. If this is a DAG Cluster, upgrade your client to 6.4. Then do 
you have full DAG functionality that makes your backup and restore easier.

Thanks
Christian

-----Ursprungligt meddelande-----
Från: Connolly, Peter [mailto:pjconn AT BUFFALO DOT EDU] 
Skickat: den 5 februari 2013 20:43
Till: ADSM-L AT VM.MARIST DOT EDU
Ämne: Exchange 2010 ACN0151E Errors and LDAP server unavailable

All,

Prior to deploying Exchange 2010 we are trying to get TDP for Exchange to work 
in our test environment.  Exchange 2010  RU3 SP2 and TDP version 6.3.
We can successfully snap to tape but when we try to restore a mailbox (original 
location, alternate location, or pst) the operation fails with these errors:

An Active Directory error 0x51 occurred when trying to check the suitability of 
server 'domain-controller'. Error: 'Active directory response: The LDAP server 
is unavailable.'
ACN0151E Errors occurred while processing the request.

During the operation I can see an established LDAP connection to the domain 
controller in question.  Google hasn't solved it for us yet - thanks in advance 
for any advice.

Peter