Pre login Handshake or Connection Timeout Period

Service was unable to open new database connection when requested.
SqlException: 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=16225; handshake=14840;
Connection string - Data Source=sqlserverintancenamehere;Initial Catalog=CatalogNamehere;Integrated Security=True;Persist Security Info=False;Max Pool Size=1000;Connect Timeout=20;Load Balance Timeout=120;Packet Size=4096;Application Name=Applicationname hereBusinessLayerHost.exe;Workstation ID=HostnameHere




setspn -a MSSQLSvc/hostname.doaminname.net:1433 ServiceAccountNameHere

need to run the above command in a command prompt, most of the time you would NOT have permissions to run this, please check with Active Directory Team or Windows Admin team.

in the place of doamin we can use  .net or .com based on the environment
after 1433 we need to give SQL Server Database Engine service account,  this is a logon account in the Configuration manager.

If this does not work please check port numbers 



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