First of all, I am not a "techie", just a user. I have no idea about any firewall setup. What I can say is that between it working and nopt working, I never touched anything except:
1 - I deleted and recreated the server in "Setup"
2 - I re-installed AltBinz.exe
3 - I restarted my PC
4 - I cleared "Login" in Setup
All of the above several times and in different order.
Also, when in the past I could not connect (FE my Internet connection had droped), at least I could se some activity in the Bottom window "# - Action - etc.). Now there is noting showing at all.