Website hosted on Plesk is not working: Microsoft OLE DB Provider for SQL Server error '80004005'

Symptoms

• Unable to browse website hosted on Plesk. The following is shown instead of content: 

  PLESK_INFO: Microsoft OLE DB Provider for SQL Server error '80004005'
  Warning: Fatal error 9001 occurred at Dec 4 2017 2:41PM. Note the error and time, and contact your system administrator.
  /Default.asp, line 67

• Cannot suspend Plesk reseller:

  C:\> C:\Program Files (x86)\Parallels\Plesk\admin\bin>reseller --off resellername
  Disable database user failed: mssqlmng failed: The log for database 'example.com_data' is not available. Check the event log for related error messages. Resolve any errors and restart the database.

• Unable to add database user for the database dbname in Domains > example.com > Databases > User Management > Add Database User:

  PLESK_ERROR: Error: Connection to the database server has failed: The log for database 'dbname' is not available. Check the event log for related error messages. Resolve any errors and restart the database. (Error code 1)

• Unable to export database dump in Domains > example.com > Databases > dbname > Export Dump:

  PLESK_ERROR: Source: System.Data
  
  Message: ExecuteNonQuery requires an open and available Connection. The connection's current state is closed.
  
  dbbackup.DbBackupException: Unable to backup database 'ARC_PIS' ---> System.Data.SqlClient.SqlException: Warning: Fatal error 9001 occurred at Dec 4 2017 2:41PM. Note the error and time, and contact your system administrator.
  BACKUP DATABASE is terminating abnormally.

Cause

Corrupted log file %plesk_dir%Databases\MSSQL\MSSQLXX.MSSQLSERVERXXXX\MSSQL\DATA\dbname.ldf.

Note: XX and XXXX correspond to the SQL Server version.

Resolution

1. Connect to the server using RDP

2. Determine SQL Server service name:

   C:\> sc query | findstr MSSQL | findstr SERVICE_NAME
   SERVICE_NAME: MSSQL$MSSQLSERVER2017
   SERVICE_NAME: MSSQLFDLauncher$MSSQLSERVER2017
   SERVICE_NAME: SQLTELEMETRY$MSSQLSERVER2017

3. Stop SQL service:

   C:\> net stop MSSQL$MSSQLSERVER2017

4. Rename log file %plesk_dir%Databases\MSSQL\MSSQLXX.MSSQLSERVERXXXX\MSSQL\DATA\dbname.ldf:

   C:\> move %plesk_dir%Databases\MSSQL\MSSQLXX.MSSQLSERVERXXXX\MSSQL\DATA\dbname.ldf %plesk_dir%Databases\MSSQL\MSSQLXX.MSSQLSERVERXXXX\MSSQL\DATA\dbname.ldf.bkp

5. Start SQL Server:

   C:\> net start MSSQL$MSSQLSERVER2017

   Note: In order to find the root cause why the database log file got corrupted, contact Microsoft support.