Alter database failed error message when setting up database mirroring

TITLE: Microsoft SQL Server Management Studio

——————————

Alter failed for Database ‘Mirror’. (Microsoft.SqlServer.Smo)

The ALTER DATABASE command could not be sent to the remote server instance ‘TCP://XXXXXX:2022’. The database mirroring configuration was not changed. Verify that the server is connected, and try again. (Microsoft SQL Server, Error: 1456)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=10.50.1600&EvtSrc=MSSQLServer&EvtID=1456&LinkId=20476