Old Custom server access URLs being used when loading plex in browser

Server Version#: Version 1.41.5.9522
Player Version#: Plex Web Version 4.145.1

Running in docker. A while back I changed the value in Settings → Network → Custom server access URLs

Today I noticed in dns logs (pihole) that there are queries coming in for my older value. This comes whenever I load Plex in my browser.

I am not able to find out where is the old name is coming from and what setting I need to change to fix this. I have confirmed my local plex settings and settings in https://app.plex.tv/desktop/#!/ and none of them refer this url.

From the media server logs

1983:Mar 17, 2025 16:59:58.133 [140278601812792] ERROR - [EventSourceClient/mediaserver/plex.my-old-name.duckdns.org:11443] Retrying in 600 seconds.
2047:Mar 17, 2025 17:10:03.139 [140278601812792] ERROR - [EventSourceClient/mediaserver/plex.my-old-name.duckdns.org:11443] Retrying in 600 seconds.
2065:Mar 17, 2025 17:20:08.147 [140278601812792] ERROR - [EventSourceClient/mediaserver/plex.my-old-name.duckdns.org:11443] Retrying in 600 seconds.
2090:Mar 17, 2025 17:30:13.152 [140278601812792] ERROR - [EventSourceClient/mediaserver/plex.my-old-name.duckdns.org:11443] Retrying in 600 seconds.
2108:Mar 17, 2025 17:40:18.159 [140278601812792] ERR/desktop/#!/settings/server/b8cb062715a95268f8d8115bf3fb1b60ec0a5a95/settings/networkOR - [EventSourceClient/mediaserver/plex.my-old-name.duckdns.org:11443] Retrying in 600 seconds.

Any pointers on where this is coming from?

edit:

I have also confirmed Library/Application Support/Plex Media Server/Preferences.xml only has the new entry.

Anytime I load the plex app on my phone/ipad etc I see dns queries for the old fqdn and new one.

Also any way to reset this value? So it only looks at the new name?

Edit: Conversation for this is now happening over a similar post.

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