SqlServer mirrored disk fault tolerance with EF6 error Principle for mirroring only

Question

Sql server 2014, Entity 6.1.2 infrastructure, .net framework 4.5, IIS 8, database mirror in enhanced security mode without a witness.

I have the following connection string

Data Source=A;Failover Partner=B;Initial Catalog=DB;Integrated Security=False;User Id=sa;Password=Password;MultipleActiveResultSets=true;Connect Timeout=10

Starting from: A = Principle, B = Mirror
And when I perform a manual transition from A to B (mirroring principle), it crashes with the inability to open the connection - Erro 40.

Starting from: A = Mirror, B = Principle
Manual fail-safe operation.
Now: A = Principle, B = Mirror
Then I do not restart the site, returning again, Error 40.
Restart IIS, stop working again.

Here is the code to test the connection:

while (!_exitFlag)
{
    using (var context = new EntityContext())
    {
        var result = context.Foos.Count();
    }
}

Any ideas?

Answer 1

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SELECT DB_NAME(database_id) AS 'DatabaseName', mirroring_partner_instance
FROM sys.database_mirroring WHERE mirroring_guid IS NOT NULL;  

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: http://blogs.msdn.com/b/spike/archive/2010/12/15/running-a-database-mirror-setup-with-the-sqlbrowser-service-off-may-produce-unexpected-results.aspx ( .)

. , , : https://dba.stackexchange.com/questions/87607/set-up-sql-server-db-mirror-specifying-ip-address-for-mirroring-partner-instance