same, sharing this problem, in the middle of a match, and been trying to get back into the game for maybe over an hour. Since the mass DC. Can log in, but shows a game in progress, however reconnecting doesn't work. I just get a black screen, and after a while if I minimize I see the firewall message.

Got this error too. Restarted my router and computer and disabled my firewall. Still got the firewall error. Didn't have an issue until after Kha'Zix was released.

Welp. There goes the fed Olaf.

same here
no response, imagine that, lol.

yet more bugs that are being ignored instead of being fixed

The same thing just happened to me as well. I was in loading screen for ranked game and client closed. had to wait in a 15 min que and I still can't connect, saying my firewall may be blocking the connection. I'm just glad to know its not just me because I thought I was going to get reported for AFK / Leaver!

Me also, restarted the modem and all that sorcery. It keeps happening!

Happened to me probably 20 minutes ago still no luck.

yeah man happened to me too a little pissed

patch day bull**** i say. riot prob cant handle they amount of users there are and the servers are fkin up big time