r/techsupport Aug 08 '22

Slow internet connection, one-click diagnosis says "Port1: The loop test result is abnormal." Open | Networking

What do I do to fix this problem? My connection's been perfectly fine since yesterday, and pretty much stopped working when I woke up today.

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u/spike2me Aug 09 '22

If this is just one computer with the issue. You have a Loopback adapter enabled, used for troubleshooting your NIC card.

Press the Windows Key+X and choose Device Manager. Expand Network Adapters and look for Microsoft Loopback or some such. Right click and Uninstall. restart the computer. https://docs.oracle.com/en/database/oracle/oracle-database/21/ntdbi/removing-loopback-adapter.html