I have created a fresh Centos 7 droplet. I noticed systemd is listening on port 111. is it used for any specific purpose by digital ocean? what are the consequences of disabling the port?

droplet was created with option of private networking

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Port 111 is rpcbind and it would be recommended to firewall it off if it’s not being used. There should be no negative consequences to setting up a firewall to block this port.