Error in shell after restart

[abe_one]

Hi everybody.
Today being on vacation, I decided to give the server a clean (I have 2 cats and despite the filters a bit of dirt enters).
I dismantled all the fans and cleaned them well.
Then I reconnected the server and turned it on.

Everything works perfectly as always, but the shell gives me this error every 30 seconds:

"Dec 28 18:59:16 home collectd[3132]: write_graphite plugin: getaddrinfo (freenas_server, 2003, tcp) failed: hostname nor servname provided, or not known"

I can only understand the word plugin, and I'm sure I do not have any other plugins installed by me, outside of Plex.

Can you help me?
I use version 11.2 updated yesterday with the latest STABLE update

 

[nojohnny101]

Are you sure you plugged the Ethernet cable into the same Ethernet port on the back when reconnected everything?

 

[DrKK]

getaddrinfo is a DNS lookup command. Did he lose his nameserver?

What happens when you drop to shell, and type something like "drill www.ibm.com"

?