When the “Access Denied: This computer is not authorized to connect to Velocity” error is produced, it is due to the Workstation or User being used not being correctly registered in the SQL/Velocity Database.
To fix this issue:
Under Databases, select Velocity, Tables, open the dbo.Workstations table
Verify the Workstation that is being used is listed under WorkstationName
Under Databases, select Velocity, Tables, open the dbo.Registry table
Verify the Server IP listed is correct under RemoteIP