Question : Connection Limit to XP 64 bit

Hello,
 Where I work we have a server with Windows XP 64 running MySQL serving a database that stores jpeg filename/location and various other features, as well as geographical reference of each photograph. We use an in house devloped software that connects to the Database using Microsofts ODBC System DSN with MySQL 3.51 drivers. Each client computer is configured this way, all running XP Pro. The software displays the jpeg images and all the other various data asscoiated with each picture.

 Everything works great when we have about 6 or 7 people accessing the database though the software. Once the amount of users jumps up to about 10-13, every so often they receive a giant red X where the jpegs are to be displayed on screen, which is something our programmer wrote to signify the program could not retreive database information. The user then moves onto another jpeg and usually it loads. The error isn't occuring in any particular pattern, all i've been able to identify is it happens more frequently when there are more users.

 The server (running xp 64 bit) has had the tcpip.sys file replaced with the correct version file to increase the number of half-open connections from 10 to 1000, and also a driver the directly edits the half open limit in the windows kernel, which have been verified to be working. I've run some diagnostics on the server and it reports as much at 20 Established connections. We still have the issue however. Is anyone aware of any other bottle necks In the Xp 64 bit OS? We run our network at 1 Gbps through a Dell Power Connect 6248 with about 25 comptuers accessing network resources from 6 different servers.

Anyone have any ideas?

Answer : Connection Limit to XP 64 bit

Sorry, that's not possible unless you're switching to a Linux server or distribute the access to more "servers". The half-open TCP connections limit has nothing at all to do with the connection limit imposed by Windows. The former is OSI Layer 4, the latter 5. The connection limit of the client OS has been in place since NT4, the TCP connection limit was only introduced with XP SP2.
Even if it were possible, nobody here would be allowed to help you, because it would be against the EULA.
Switch to a server OS, which has the addiitonal benefit that you can create a domain with centralized user and computer management.

Inbound connections limit in Windows XP
http://support.microsoft.com/kb/314882

Troubleshooting Server Message Block inbound connection limit in Windows peer-to-peer workgroup
http://support.microsoft.com/kb/328459