Purpose:
This article describes how to troubleshoot a situation where history logs /server logs are showing "unable to read data"
Troubleshooting
If you come across “Unable to read data” messages (as seen in the screenshot below) in the History logs or the WMS Pro server logs, check in the CTPlus to see if there are more than one comms path pointing towards WMS Pro.
To check this, please log into CTPlus, Go to Panel Programming >Communications>Comm Paths
Check in the list of comm paths that if you have two comm paths enabled and have the same server IP address with same send/receive port.