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Event ID: 8031 Source: MSExchangeAL

Unable to open LDAP session on directory '<directory name>' using port number <value>. Directory returned the LDAP error:[0x<error code>] <error message>. <connection agreement name>.
Double-check your DNS reverse lookup zones. I had an OEM box we changed over to 192.168.200.x address space for the LAN and missed that the reverse was still set to 10.0.0.x with no 192.168.200.x reverse zone in there. I deleted the incorrect zone and created a new zone to resolve.
As per Microsoft: "This event indicates that the Recipient Update Service (RUS) was unable to contact a domain controller. The directory may not be available, or the name of the domain controller specified in the properties of the Recipient Update Service may be incorrect". See MSEX2K3DB and the link to "EventID 8031 from source MSADC" for details on this event.

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