we recently created a new domain with a domain controller and Exchange 2003 on separate machines, within a forest. Users within this domain are unable to send/receive email and below is the error message that appears in Event Viewer:
LDAP returned the error  Unwilling to perform when importing the transaction
dn: <SID = 0102000000000005200000002A020000>
DC= PRQ01 ,DC=SAKJ,DC=COM
Within System Manager when I try to connect to other Exchange Servers within the forest i.e. When I try to connect to the Master, I get the following: The Semaphore timeout period has expired.
When I try to connect to other Exchange Servers which are not the master I just receive: The remote server did not respond to a connection attempt. All other domains are connected via Leased Lines and this domain is connected via a VPN Tunnell. All DNS looks ok and I can ping everything