OS X Clients won't bind to 10.7.3 Server. Error 2100

I have a Server running 10.7.3, my clients also 10.7.3 will not bind to the OD. It returns the error 2100. I did some reasearch and apparently this issue is to do with having an SSL on the OD, but I don't have an SSL running on it. Does anyone know the fix for this or is any one else having this issue? Any help appreciated.