[Miscrosoft][ODBC SQL Server Driver]Unspecified error occurred on SQL Server

The following ODBC error occurred:

Error: [Miscrosoft][ODBC SQL Server Driver]Unspecified error occurred on SQL Server.
Connection may have been terminated by the server.
State ID: HY000

Scenario:
NAV on SQL Server

Problem:
Security permissions lost or not loaded

Solution
> verify free space on Data\Log Disks
> compact SQL LOG FILE
> restart SQL SERVER (resolve log errors)