Internal DNS host name cache overflow condition. In the past %1 minutes, the internal DNS host name cache has reached capacity ...

Lync Server 2013

Internal DNS host name cache overflow condition.

In the past %1 minutes, the internal DNS host name cache has reached capacity %2 times. The cache can retain a maximum of %3 results.
Cause: The SIP protocol stack in Lync Server retains an in-memory cache of DNS query results in order to reduce the amount of network traffic generated by DNS host name (A) queries. It is unusual for this cache to overflow, however, it is possible if a server interacts with many peers, such as the Access Edge Server with many federated partners.
Resolution:
Consider increasing the size of the DNS cache using the "DnsCacheRecordCount" setting in the configuration.

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