should work without +ip regardless
unless youre not port forwarded properly...
also make sure sv_lan is 0
if u can connect to your server via WAN IP
not LAN IP
then it is joinable and working
cant really help you much further than that
rest is up to you if u can port forward or not
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also just thought of why it says unable to set port
u could be setting the wrong wan ip to the +ip parameter...
do u know how to get your WAN IP?
www.whatismyip.com
nite