Port 8333 and Issues to have a connection
You are conflating the two ports that Bitcoin Core opens and uses.

There is the Bitcoin network port. That is port 8333 by default. You DO NOT want to try to connect to that as it is used for the connection to other nodes on the network.

The port that you do care about is the rpcport. That is port 8332 by default. This is the port that you want to connect to as that is what lets you interface with Bitcoin Core.

If you don't set the port or rpcport options in the bitcoin.conf file, then the default ports will be used.



As a security measure, Bitcoin Core does not allow anyone to connect to the rpcport. You will need to explicitly allow an IP address to connect to it by using the rpcallowip=&lt;ip&gt; option in the bitcoin.conf file. If you set it to 0.0.0.0, it will be open to all IP addresses, but this is not recommended as it is not secure.



In your Qt settings, you have proxies enabled with port 8333. That's incorrect. Those are not the IP and port that you want Bitcoin Core to use but rather that a proxy is listening on those ports.