No more connections can be made to this remote computer/too many connection windows 2003 server

Currently I see 10 connections to the server.  If the 11th users tries to access the remote share on this server they receive the following message:

"No more connections can be made to this remote computer at this because there are already as many connection as the computer can accept."

how do you increase this from 10?  I thought Window server 2003 has suppose to support up to 65000 connections?

I have tried increasing the Max limit as suggested here:

2. Locate and then click to select the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\

CurrentControlSet\Services\Lanmanserver\Parameters
3. On the Edit menu, point to New, and then click DWORD Value.
4. Type MaxMpxCt, and then press ENTER.
5. Right-click MaxMpxCt, and then click Modify.
6. In the Value data box, type the desired value, and then click OK.

with no change.