Riot Games's League of Legends login issues due to expired SSL certificate(old.reddit.com)
old.reddit.com
Riot Games's League of Legends login issues due to expired SSL certificate
https://old.reddit.com/r/leagueoflegends/comments/1q40aen/comment/nxpij3c/
Temporary workaround is to set your computer's clock back to before the certificate expires, until a new client build is released with an updated certificate, presumably.
Surprisingly, not a DNS issue, for a change.