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I recently upgraded all of our hardware and software for our bookstore retail database and registers and now a strange issue has surfaced.  Most of the time, but not ALL the time, when a cash transaction is tendered, the POS register freezes.  Sometimes it freezes for a couple of minutes and sometimes for much longer.  I cant find any answers in the forum.  Here is some further info:

All machines (database machine and registers) are running Win7 pro sp1.

All machines have static IP addresses

We are using Dynamics RMS 2.0 and SQL Server 2008 R2

On database machine, the protocols are set to the following order: 1. shared memory, 2. named pipes, 3. TCP/IP

On registers, Client Network Utility is configured such that named pipes and TCP/IP are both enabled and in that specific order.

On registers, Client Network Utility is configured such that an alias is created with an alias name, TCP/IP as the network library, and the ip address of the database machine using port 1433.  Port 1433 is the port that the database machine is listening on.

There are no Antivirus or firewall obstacles causing this issue.

If anyone could offer some help, I would GREATLY appreciate it :)