The server network address "xxxxx" can not be reached or does not exist. Check the network address name and reissue the command.    Pls check endpoints on all servers using  SELECT * FROM sys.endpoints   If 1418 error: check it these, duplicate end points exists, tcp/ip enabled or not, check editions principal and mirror, windows firewall off, check login not created in mirror instance.   How to delete duplicate end points if exists ?   IF EXISTS (SELECT * FROM sys.endpoints e WHERE e.name = N'EndPoint_name')  DROP ENDPOINT [EndPoint_name]  GO  
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