I had that problem several times but restarting my PC seemed to fix it each time. I think the server browser actually crashes my router. I've seen this happen with Dayz's server browser (commander) too. something to do with it using too many connections or something.
In other news, I can't seem to get any better at this game. I'm never very sharp with "shooters" (term used loosely for Chivalry) but I usually see a net and quick progression in my skills in the first dozen hours. I'm roughly 1:1 on my KDR and have not gotten better since day 1. And 1:1 is not "decent for a noob" when you know I pick my fights fairly carefully and get a good quarter of these kills by circling and stabbing people in the back when they're busy running or fighting someone else.
Anyway. Any other tips (playing vanguard with the 3rd sword atm mostly) would be welcome.