I got quite a lot following timeout exceptions from my V12 SQL Azure database (P1):

Connection Timeout Expired.  The timeout period elapsed during the post-login phase.  The connection could have timed out while waiting for server to complete the login process and respond; Or it could have timed out while attempting to create multiple active connections.  The duration spent while attempting to connect to this server was - [Pre-Login] initialization=261; handshake=842; [Login] initialization=0; authentication=0; [Post-Login] complete=12994;

I am using Entity Framework 6 to connect DB.

What does post-login phase timeout mean?  What might be causes of this post login phase timeout?

Hi Youxu,

You may reference the below link in which the same error message when connecting Azure DB from the Entity Framework 6.
SQL Azure - The timeout period elapsed during the post-login phase

In other cases,timeout can be caused by "out of resources" issue on the SQL Server. It is too busy to be able to respond to the login request. You may need to check CPU/RAM and Disk IO performance counters during the failure time.

below Link for your reference.
Azure SQL Database introduces new near real-time performance metrics

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