Rpcbind

rpcbind universal addresses to RPC program number mapper. Listens on TCP and UDP port 111 and distributed in rpcbind package in Ubuntu and Debian.

apt-cache rdepends rpcbind
...
monitoring-plugins-standard
...

systemctl stop rpcbind
Warning: Stopping rpcbind.service, but it can still be activated by:
  rpcbind.socket

systemctl status rpcbind
● rpcbind.service - RPC bind portmap service
     Loaded: loaded (/lib/systemd/system/rpcbind.service; enabled; vendor preset: enabled)
     Active: active (running) since Wed 2020-04-22 09:49:39 UTC; 2h 37min ago
TriggeredBy: ● rpcbind.socket
       Docs: man:rpcbind(8)
   Main PID: 12368 (rpcbind)
      Tasks: 1 (limit: 4691)
     Memory: 696.0K
     CGroup: /system.slice/rpcbind.service
             └─12368 /sbin/rpcbind -f -w

Apr 22 09:49:39 hostname systemd[1]: Starting RPC bind portmap service...
Apr 22 09:49:39 hostname systemd[1]: Started RPC bind portmap service.

systemctl stop rpcbind.socket

See also

• RPC, rpcbind, rpcinfo, rpc.statd, WS-RPC, HTTP-RPC, OpenRPC
• Nagios