SQL 2005 High Protection Failover Error

Hi

I am experiencing a problem while performing failover testing on 2005 Standard.
I have an application which uses an ODBC connection SQL Native Client with a failover partner.

The following is the series of events that cause the problem. I am using a domain admin account whilst testing which has a server login on both servers with the same privileges.

Server A (Principle)
Server B (Mirror)
**Application can connect**

Manual failover

Server A (Mirror)
Server B (Principle)
**Application can connect following a restart**

Server A is switched off

Server B (Principle, disconnected)
**Application continues working**

***restarting the application the following error occurs***

€œConnection Failed
SQLState 08001
SQL Server Error 53
[Microsoft][SQL Native Client]Named Pipes Provider: Could not open a connectionto SQL Server [53].
Connection failed:
SQLState: '08001'
SQL Server Error: 53
[Microsoft][SQL Native Client]An error has occured while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections.
Connection failed:
SQLState: 'S1T00'
SQL Server Error: 0
[Microsoft][SQL Native Client]Login timeout expired€œ

Any help with this would be most appreciated

Peter