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When attempting to connect to a SQL Server geodatabase, the following error message is received:
“Error: Failed to connect to database: Unable to complete login process due to delay in opening server connection. No extended error.”
The firewall on the server may be blocking the connection.
Add the SQL Server default ports 1433 and 1434 as exceptions in Windows Firewall.
Refer to the following Microsoft TechNet Library topic:
Configure the Windows Firewall to Allow SQL Server Access