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Wednesday, February 22, 2012

Duplicate name on network warning in SCOM

Came across this lovely gem recently. Troubleshooting steps didn't really help, at all.

A duplicate name has been detected on the TCP network. The IP address ofthe machine that sent the message is in the data. Use nbtstat -n in acommand window to see which name is in the Conflict state.

Servers in this case were in the DMZ, weren't in a domain and definitely did not have duplicate names. They did have multiple network adapters, but that shouldn't have caused the issue. Finally realized, the systems had been converted (PtoV) into our virtual enviornment from physical.

Dropped to a command prompt and ran "set devmgr_show_nonpresent_devices=1" to ensure device manager would show all hidden devices. From there, I ran devmgmt.msc to open device manager and then from the toolbar, I selected the "Show hidden devices" option. Going through, the old network adapters were still in there. After removing the adapters and rebooting, the warning did not come back. explains how to show hidden devices in windows.

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