Event ID - 2106

Event Id2106
SourceMSExchangeDSAccess
DescriptionProcess <process> (PID=<PID>). DSAccess failed to obtain DNS records for domain <domain>. DNS Priority and Weight for the Domain Controllers in this domain will be set to the default values <value> (priority) and <value> (weight).
Event InformationFollowing information from a newsgroup post may help:
"This event occurred in our case due to DNS configuration problem. In DNS servers network properties DNS tab, it should point to itself. In our DNS server it was pointing to external DNS server. Corrected this configuration and thus stopped this event."

See following Microsoft article to know about DSAccess.
Reference LinksXGEN: The Role of DSAccess in Exchange 2000 Server

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