SQL 2012 SP1: Errors on starting database server named instance

I recently got some weird SQL Server error messages in the Application event log after rebooting my SQL 2012 SP1 server, running on Windows Server 2012:

Event ID 26014: Unable to load user-specified certificate [Cert Hash(sha1) “D3D88810B87C9533AA30CE9B2C3BDCEE3C674B97”]. The server will not accept a connection. You should verify that the certificate is correctly installed. See “Configuring Certificate for Use by SSL” in Books Online.

Event ID 17182: TDSSNIClient initialization failed with error 0x80092004, status code 0x80. Reason: Unable to initialize SSL support. Cannot find object or property.

Event ID 17182: TDSSNIClient initialization failed with error 0x80092004, status code 0x1. Reason: Initialization failed with an infrastructure error. Check for previous errors. Cannot find object or property.

Event ID 17826: 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.

Event ID 17120: SQL Server could not spawn FRunCM thread. Check the SQL Server error log and the Windows event logs for information about possible related problems.

These errors confused me, because as far as I know, I’m not using SSL for my SQL Server instance. To solve the issue, I opened the SQL Server Configuration Manager –> SQL Server Network Configuration –> right-click “Protocols for CM12” –> Properties –> Certificate tab. Click the “Clear” button and restart the service. Hopefully this clears up the error.