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Test-CsFederatedPartner : A 504 (Server time-out) response was received from the network and the operation failed.

Issue:  Lync federation not working.

Error: Test-CsFederatedPartner : A 504 (Server time-out) response was received from the network and the operation failed. See the exception details for more information.
Problem Statement:
Recently many Lync user complain regarding Lync IM not working with federated partner. However nothing was change however Lync federation got stopped working. When tested federation using Lync power shell it was giving above error.

Resolution was very simple and straight forward. However you must check below steps to find solution.

1.    Try to telnet target Lync edge FQDN using 5061 port number.

2.    Test-CsFederatedPartner  –Target “Lync Server Pool FQDN” –Domain “Partner Domain name” and see the result. If you get  above error means something with your federation partner Lync domain issue.

3.    Try to nslookup on command prompt and type below.

Set q=srv

You will get the exact edge FQDN and verify with access edge FQDN which you configured in External access, under allowed domain.

4.    Go to Lync Control Panel and check the Lync Edge server FQDN and Domain name.

5.    If Access Edge FQDN is not correct then change to correct one and test the Test-CsFederatedPartner command and see the result.


6.    In my case Access edge FQDN was changed from federation partner. I have corrected the same and Lync federation started working. 

Thank you.


  1. when you putting commands as 'nslookup' 'edge FDQN' etc, the most important information is which interface are you refering to? which DNS are you qeuring? from which station? edge has names in 3 zones - internal, DMZ and external. so which FQDN, which interface, which DNS server....


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