When I first read that I was sure that must largely apply to the calling (voip) features, but testing showed me I was wrong. I couldn't even make messaging work through a firewall so now I sourly use Telegram instead (no private chats by default in telegram??).
"You need to open TCP 31337 and all UDP ports in order for Signal to work." Emphasis mine.
http://support.whispersystems.org/hc/en-us/articles/21369721...
When I first read that I was sure that must largely apply to the calling (voip) features, but testing showed me I was wrong. I couldn't even make messaging work through a firewall so now I sourly use Telegram instead (no private chats by default in telegram??).