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SQL Mirroring problem

umentech asked
Last Modified: 2012-06-21
Someone removed the witness from our SQL Mirroring configuration.
He wanted to do a test. (Bad idea on a production server)
Now, when i try to add the witness, i get the following error message :

ALTER DATABASE xyz SET WITNESS='TCP://abc.domain.com:7022';
Msg 1427, Level 16, State 31, Line 1
The server instance 'TCP://abc.domain.com:7022' could not act as the witness. The ALTER DATABASE SET WITNESS command failed.

All servers use SQL 2008 (10.0.4000)
Endpoints are started. Authentication by certificate.
I can telnet the port.

Everything worked fine before the witness was removed. Why can not I add it?
Any idea ?

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