I have a few ASP.NET web applications that are connecting to Microsoft SQL Server. Two of them tend to sometimes get hit with the following errors. Once it a while this issue happens and sometimes not happening for a couple of days.
Connection Timeout Expired. The timeout period elapsed while attempting to consume the pre-login handshake acknowledgement. This could be because the pre-login handshake failed or the server was unable to respond back in time. The duration spent while attempting to connect to this server was - [Pre-Login] initialization=10; handshake=14992;
The value for initialization and handshake tend to change when it happens. But i'm unsure what does it mean.
I have verified the following:
- The ASP.NET web applications closed the database connection after done using it.
- It is not IPv6 issue.
- Incoming and outgoing for port 1433 is enabled.
The SQL Server and the web applications are in different servers. The applications connect to the database using the hostname defined in the hosts file.
I would like to request for assistance regarding this issue.