I'm using Windows 10, Whenever I try to connect to an external server that I added, it always and only says "connecting to external server" then when it loads it goes to a screen that says "unable to connect to world". I can connect to any of the 5 featured servers perfectly fine but non of the servers I add. Also when I'm on the server list, when I look at the servers i added it says "locating server" and to the right of that there is a red dot.

(side not, I am new to this so I mostly just guessed on what the "affects version/s" is when filling out the information for this issue"