SQL Server Service can not start because of antivirus program

ERROR MESAGGES:

“Could not start the network library because of an internal error in the network library. To determine the cause, review the errors immediately preceding this one in the error log.”

“SQL Server could not spawn FRunCM thread. Check the SQL Server error log and the Windows event logs for information about possible related problems.”

“TDSSNIClient initialization failed with error 0x2726, status code 0x1.”

“TDSSNIClient initialization failed with error 0x2726, status code 0xa.”

EXPLANATION:

You may see these error messages when you try to open a newly installed SQL Server Instance.

SOLUTION:

When I encountered these errors, the antivirus program was installed on the computer. The SQL Server service could be started when the antivirus program was stopped.

The problem was that the antivirus program blocked the port and SQL Server service used by SQL Server Instance.

The problem is solved after defining the necessary exceptions for SQL Server in the antivirus program.