Mirror and Witness Connection in a Disconnected state immediately after adding Witness Server to Mirror session.

After adding the Witness Server to the Mirror session, the Witness Connection state between the Mirror and Witness Connection is Disconnected and the state between Principal and Witness Connection is Connected.
The procedures defined in Books Online was used to setup Database Mirroring...when the Witness server was added to the Mirror session, only the alter database T-SQL statement was executed on the Principal server.
ALTER DATABASE <db_name> SET WITNESS = 'TCP://<servername>:<port>'
After executing the above statement, a few seconds later the state between Principal and Witness Connection changed to Connected and the state between Mirror and Witness Connection remains Disconnected.
The Mirror session is not using Certificates, every server is on the same domain, using the same domain login account, and all servers have SP2 installed running Enterprise Edition.
Any idea's why the state between Mirror and Witness Connection remains Disconnected?
Thanks,

I have the same problem. All 3 servers are on a workgroup and I'm using certificates. All three servers are connected via switch. This is a test environment, with the principal server being a 64 bit OS with Windows Server 2003 R2 with SQL Server standard x64, the witness server is a Windows server 2003 SP2 x32 with SQL Server Express, and the mirror is Windows XP x32 with Sql Server Standard. Using hard coded static IP addresses (FQDN makes no difference, and they get resolved to IP addresses anyway!). The mirror server log shows
'The server instance Witness rejected configure request, read its error log file for more information
but of course there are no errors logged on the witness server - not by SQL, nor in the event log. When the witness is set on the princial server, the Database mirroring monitor shows almost immediately that the witness and prinicapl servers are connected, but it takes quite a few seconds before the witness/mirror state is shown as disconnected. Until then the entry is blank. The monitor also shows High Saftey with automatic failover, which isn;t true - since the mirror and witness are not connected, no failover occurs when the principal is taken offline.
Since I'm running terminal services on the XP machine to interact with the witness and principal server, I find it hard to image that there are network issues.
If the witness can connect with the principal and the principal can conect with the mirror, under what circumstances will the witness NOT connect with the mirror? When I check the witness server for entries in the database_mirroring_witness view the following is shown:
RTJobs TCP://primary-sql:5022 TCP://192.168.100.14:5022 2 FULL 1 1 2263BD97-1004-4D73-9966-7AFB89E5626E A6EE18DF-19C4-48EC-8C06-77074EF5A275 0 1
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