[Help] Private Server

I think there may be a cap on how many people are allowed to log into my server at once. When there are 5 people logged in it wont let anyone else log in. Does anyone know how to make it so more people can log in?

I saw in another post it said you are using Original LOTF, if so then you shouldn't have that problem.

Idk for sure if that's the problem, but it seems like it. Once 5 people are logged in other people get "Error: Connection with the server was interrupted. Please re-log into the game." And I am using the original LOTF source =P

//edit: I also noticed when there are 5 people online and another person is trying to log in, this appears in the game console every time they try
-->System.NullReferenceException: Object reference not set to an instance of an object.
at COServer_Project.DataBase.Authenticate(String UserName, String Password) in D:\Documents and Settings\JayJay\Desktop\LOFT Source\Source\COServerProject\DataBase.cs:line 1354
(idk what that means srry =p)

This is what's on Line 1354
-->if (DSet != null && DSet.Tables["Account"].Rows.Count > 0)