This computer's local hostname is already in use on this network.

Recently, Xfinity texted me and asked me if I wanted to accept the free upgrade of my Internet gateway to the newer and faster version. I accepted and they send it to me. The automatic set up process seem to go smoothly, but now I am starting to get these messages:

This computer's local hostname

"Timothys-Mac-mini-3.local" is already in use on this network.

The name has been changed to

"Timothys-Mac-mini-4.local".

I accepted the message thinking it was a one-time thing, but today, when waking the Mac up from sleep, I got the message again. Is this normal, is it going to be a regular occurrence, and is there a simple way to stop this message from popping up repeatedly?

iMac 27″, macOS 10.13

Posted on May 5, 2024 10:23 AM

Top-ranking reply

MartinR

Level 7

24,330 points

Posted on May 5, 2024 3:53 PM

Try shutting down your Mac, then reboot your router (any any other network equipment in the mix, like an ethernet switch). After the router is back online, then restart your Mac.

This can also happen if you have both wired ethernet & WiFi connections simultaneously enabled on your computer.

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This computer's local hostname is already in use on this network.

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