Hello
@sitenet, I see from this and your other post you are really worried about server security, which is basically a good thing. However, on a server there are many services that need to communicate with each other, and there are many routes through services and even from and to external resources that must remain open so that all the things your host computer and the software on it must do can be complete successfully.
Port 953 for example may not be widely known, but it is indeed something very useful for the domain name resolution. It should not be blocked when your server is in any way involved with resolving domain names, e.g. if you have a BIND daemon on it (the BIND component for example).
Port 12346 (from your image) is in the ephemeral range. It is very likely used by some service to transmit data. Ephemeral ports should not be closed. There are no services behind such ports, so if an attacker was to drive an attack against such a port, nothing will respond, because no service is listening. But when you close such ports, several internal and internal-to-external transactions will fail, because some services won't be able to communicate data packets any longer.
Please have a look at this useful Wikipedia article, maybe it can help you to spend your evening relaxed with a cup of tea ;-) not worrying so much about the firewall stuff and co. Plesk comes with ready-to-use firewall settings. For most any cases there is no need to do extra configurations.
en.wikipedia.org
Plesk also has a list for you with the ports that Plesk software needs:
For Plesk and its services to work correctly, certain ports must not be blocked.
docs.plesk.com
And again: Relax. Plesk has a slogan: "Build Secure Run", and it's really that simple. The "Secure" is paid a lot attention to. You are good to go with a default setup for most scenarios.
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