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How to determine which device is sending bad packets to server?

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Last Modified: 2014-12-19
We have an older version of Microsoft Dynamics Navision on our network. Over the past few weeks it's been reporting an error - error 18 in module 244, multiple times/day, in the Windows 2003 server event log. Research on this error points to a network issue, possibly CRC, or some other related situation where bad packets are sent to the Navision server.

However, I haven't found a good way to determine which device (we have 100+ users) is sending the bad packets. I've replaced the NIC and cable on the server, and that didn't help. I've installed Wireshark, and I've tried looking for anything odd around the time the log entries are recorded, but I'm new to it and I don't know what to look for specifically, as nothing stood out.

Thanks.
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