ADO.NET 2.0 Failover bug
The connection may time out before the first try to connect to the failover partner server when you try to connect to a SQL Server 2005 mirrored database by using an ADO.NET 2.0-based application. It seems that there is a problem connecting to the failover partner server using ADO.NET 2.0
Although this feature is not full suported, there is already a hotfix available. (not downloadable, you have to contact Microsoft for this topic)
- Ken