No federation with specific domains

A customer of mine had this strange problem; they could not federate with two of their partners. All others were working just fine, whereas these two only gave the infamous “presence unknown” status. They even got confirmed that others could federate with these domains too, just not them.

I remembered from a previous event that Windows Server 2008 R2 root certs in some cases may be corrupted, so this was my primary suspect.

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No federation for additional SIP domains

The other day I had a call from a customer for which I quite recently set up Lync Server 2010. They were experiencing problems for some of their employees not being able to federate with external domains.