# An unknown device appears in the Devices list?

**URL:** <https://forum.alta.inc/t/an-unknown-device-appears-in-the-devices-list/2495>\
**Category:** Switches\
**Tags:** controller\
**Created:** [June 8, 2024, 8:33pm UTC](https://forum.alta.inc/t/an-unknown-device-appears-in-the-devices-list/2495 "2024-06-08T20:33:54Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![TomLeo](https://forum.alta.inc/user_avatar/forum.alta.inc/tomleo/32/791_2.png) [@TomLeo](https://forum.alta.inc/u/TomLeo)\
**Post date:** [June 8, 2024, 8:33pm UTC](https://forum.alta.inc/t/an-unknown-device-appears-in-the-devices-list/2495/1 "2024-06-08T20:33:54Z")

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A new device is displayed in my device list, I have connected a TPlink switch to port 21, also another TPLink switch to Port 22, the device at port 22 now suddenly appears in the device list?

Port 21 – TP Link Switch 1-- Printer

Port22 – TP Link Switch 2-- Ps5 and Desktop PC

Unfortunately I don’t know why the TP Link switch is now displayed? or why it doesn’t appear on port 21.

Please for tips. Thanks

In addition, the traffic display shows 0/0 on the PS5 and on the “unknown device” even though, according to the router, the line is about 90% busy. A game download is running on the PS5

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**Author:** ![TomLeo](https://forum.alta.inc/user_avatar/forum.alta.inc/tomleo/32/791_2.png) [@TomLeo](https://forum.alta.inc/u/TomLeo)\
**Post date:** [June 9, 2024, 5:24am UTC](https://forum.alta.inc/t/an-unknown-device-appears-in-the-devices-list/2495/2 "2024-06-09T05:24:58Z")

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I found the cause, the tpLink Switch has a switch for ‘loop protection’, I set it to off and now the tp link switch is no longer listed in the devices

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**Author:** ![system](https://forum.alta.inc/uploads/default/original/1X/087669c3d7c0a6495087b41d6f385a6771f2231c.png) [@system](https://forum.alta.inc/u/system)\
**Post date:** [January 12, 2026, 4:27pm UTC](https://forum.alta.inc/t/an-unknown-device-appears-in-the-devices-list/2495/3 "2026-01-12T16:27:08Z")

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