So about your patch...
10/10 of our last ranked game's players got the "check your connection and firewall and retry" message while attempting to load in. I personally closed/reconnected 4x before I finally started loading in. Our adc didn't make it. Fortunately we rolled the /rm for it, but it's pretty clearly an obvious server issue, as 10/10 people were having trouble with only the game loading in, and all other internet functionality working normally.
I will of course be submitting a support ticket, but just throwing this on the boards so everyone can riot until the game's functionality is responsive again.