Symptoms

• The following error appears in the SQL Server log:

  Login failed for user '<BITBUCKET_USER>'. Reason: Login-based server access validation failed with an infrastructure error. Check for previous errors. [Client: 127.0.0.1]
  Error: 18456, Severity: 14, State: 12

• The following appears in the atlassian-bitbucket.log:
  

  2015-04-09 13:53:16,046 WARN  [http-nio-80-exec-7] user @1BFSM6Dx833x1035x0 35ndgf 192.168.30.100 "POST /admin/db/edit HTTP/1.1" c.a.s.i.db.DefaultDatabaseManager A connection could not be opened with the DataSource
  org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is com.microsoft.sqlserver.jdbc.SQLServerException: Login failed for user '<BITBUCKET_USER>'. ClientConnectionId:

Cause

Error: 18456, Severity: 14, State: 12 means that the authentication is successful, but the server access fails due to permission.

Resolution