https://bugs.winehq.org/show_bug.cgi?id=44895
--- Comment #9 from mail+wine@m-reimer.de --- Maybe this should also be added to the OpenWRT bugtracker as clearly OpenWRT also does "something" that makes LoL fail to connect the servers.
I dumped the sysctl settings of my AVM Fritz!Box 5050 and tried to change as much settings as possible of my OpenWRT router to the AVM settings. So far without success.
In the meantime, my brother replaced his OpenWRT router with a selfmade router (Banana Pi, second LAN via USB) installed with Debian and with a selfmade Firewall settings on it. With this setup, he also doesn't have the LoL login issue if run via Wine.
So "something" with OpenWRT is the reason here. They did "some" setting that causes LoL to fail. I just still don't know if this is some kernel setting or a packet filter setting that causes this.
Next thing I'll try is to change the OpenWRT sysctl settings to his Debian sysctl settings. Unfortunately I can't port his Firewall to my OpenWRT router to test this as he didn't use netfilter for his rules.
For me this is not highly critical. I would prefer to use my OpenWRT box, but the proprietary router does its job and maybe at some point a solution for this problem is found...