SO i found out today by doing some testing that arma3server.exe running as a hc will not connect to a dedicated server. But using arma3.exe will.
I rent a dedicated box running windows server 2008 r2
I also run tcadmin2 to manage my servers. I use steamcmd to setup the server and install the dedicated server steam ID 233780
My server runs fine, but when i want to run a HC from the same machine, i am unable to do so with arma3server.exe -client -ip=127.0.0.1 -port=2342
the client window just sits there doing nothing.
you can read my full article at https://forums.bistudio.com/topic/201898-headless-client-issues-since-v158/#comment-3146392