We are getting the following event (Lync server application log) every 10 minutes on our Lync 2010 edge server:
Event 14603, LS Protocol Stack
"The following discovered partners are sending frequent invalid SIP requests to the Access Edge Server.
Traffic from these partners is restricted to 1 message per second as a security measure.
Certificate Subject: "External company name here"; Issuer: "NL, TERENA, TERENA SSL CA"; Serial Number: Serial number here
Cause: Federated partners that were discovered through DNS SRV are sending frequent SIP requests that cause an error response from the local Lync Server deployment.
It is recommended that connections from these partners be blocked at the firewall."
The other company also have similar events from our system.
We are allowing federation to all partners, and federation works both with this company and others, including MSN
Anyone having similar issues?