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The host file you need only to change if you use a dynamic dns server like https://www.noip.com/ (I don't know if this service works for Trinity core.) First change on your server PC network setting so that you have a static IP and forward your ports to this IP afterwards. With a dynamic public IP you have to inform your friends about this IP every time it changes and they have to change the IP in the realmlist. (Or you use a ddns service). Additional you have to change the IP every time in the auth database realmlist and restart the server. In both config files (auth + world) there must be this (should be the default value): BindIP = "0.0.0.0"

Well...this is a spanish video-tutorial but maybe it can help you: trinity public server By the way, I remember that old versions as 3.3.5 used differents ports but I'm not sure if it has changed and trinity 3.3.5 use the same ports than legion now... Check your server configs for knowing it...

127.0.0.1 for localAdress works well mostly. But is your public IP a static IP? Some provider in some countries change this on a daily schedule. Does your server PC has a static IP ? And did you forward both ports to your server ? (As SarcNBit asked?) Check your ports: https://www.yougetsignal.com/tools/open-ports/ (ATM they are closed for your given IP)

I have heard of this issue on 7.2.5 but not 3.3.5a are you sure you are not using anything custom and everything is from a fresh start including your core files just checking because everything seems to be working like it should for me including 4.3.4