You may see “A trusted server….” error while publishing Lync Server 2013 topology.

In my case, I was adding Archiving and Monitoring role in existing Lync environment and had never faced this issue before.

After searching and looking into the error, I observed this error is occurring because of some existing entries in Active Directory.

To resolve this issue, I followed the below steps.

Note: Please take your AD backup before playing with ADSI Edit or ask your AD expert to perform the same activity.

1. Open ADSI Edit (adsiedit.msc)
2. Open Configuration partition and navigate to CN=Services>CN=RTC Service>CN=Trusted Services.

1. Go to the properties of each entry under “CN=Trusted Services”.
2. Type “msrtc” to search the Lync attributes in the property.

1. Cross verify “TrustedServiceType” and “TrustedServerFQDN” with the error.
2. Close the property and delete the entry.
3. Publish the topology.
4. If you get the same error again with different TrustedServiceType, follow the same procedure one more time.

Finally, publish the topology 🙂