DNS query spam coming from my NAS

Plex Media Server
1

Server Version#: 4.102.1
Player Version#: NA

I’m running Plex on my NAS server and it works perfectly fine as far as I can tell. I’m only using it on LAN and haven’t enabled remote access.

I’m also running AdGuard Home as DNS server on another machine and I see lot of queries coming in from NAS to resolve: 192-168-2-50.abcdefghijklmnopqrstuvwxyz012345.plex.direct. First, they are sent every ~40 seconds on average, second the DNS server logs 4 of such request for given timestamp. Note that the queries are not getting blocked, so it’s not like the NAS server doesn’t get the response. From another Windows computer in LAN:

>nslookup 192-168-2-50.abcdefghijklmnopqrstuvwxyz012345.plex.direct
....
Non-authoritative answer:
Name:    192-168-2-50.abcdefghijklmnopqrstuvwxyz012345.plex.direct
Address:  192.168.2.50

I can just put the entry into ignore list so it doesn’t show up in DNS dashboard, but I first wanted to check here if anything unusual is going on. Is it normal behavior that the server would do so many repeated queries for the same thing all the time?

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2

Totally normal.

3

That post is related but doesn’t answer my questions:

  1. Why is the NAS running plex sending the DNS queries? From the post I understand it would be the client trying to connect to this hostname, which would involve DNS resolution. But why does server itself make a query?
  2. Why is the frequency / count so high?
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