I noticed that this morning there was a spike in DNS requests. Apparently about once a day my plex server makes thousands of DNS requests for both the A and AAAA records of tmsapi.plex.tv.
Jan 27 03:14:16 - 03:26:30: 5711
Jan 28 04:58:41 - 05:08:20: 2154
Does anyone have any idea of why Plex would be making so many requests?
Also on my network meta.plex.tv , musicbrainz.plex.tv and lastfm-z.plex.tv all seem to get hammered by the server as well. Is there something which is causing Plex servers to do lots of unnecessary lookups?
A problem has just been identified in use of cache on the server and a fix is expected in the next beta - hopefully in PMS 1.12.3. Requests are being repeated instead of using the cached data
Plex Media Server version 1.12.3.4947 has just been released as beta
It has a fix for caching bug where the cache was not correctly checked before making EPG requests to tmsapi.plex.tv. With this fix, the volume of requests should reduce significantly - 75% reduction has been observed.
Also you could check to see if there are a lot of cache files for the EPG
See directory Cache\Http v.plex.providers.epg.onconnect within the Plex Media Server data area