Update: Matchmaking is back on, so you can go back to playing League again! You can still see the original story below.
Ranked matchmaking queues in North America went down at approximately 1:54 p.m. ET on Thursday. Less than an hour later, all other game modes also had their matchmaking queues disabled while Riot announced the outage and the fact that they are working on a fix.
The issue hasn’t been explained by Riot Games yet, but we’re keeping an eye on the League of Legends service status page. As of writing this, it has two notices that say the following:
Network Operations – 17 minutes ago
We are currently dealing with an issue that we are seeing with matchmaking and have disabled all game modes while we work on applying a fix.
Network Operations – 1:54 PM
Ranked queues are temporarily disabled while we investigate an issue that’s negatively impacting games.
It appears that all games that have already been started will finish normally and won’t be affected by the disabled matchmaking. It should be noted that Riot disabled matchmaking themselves, and this is not an outage caused by any other source.
This post will be updated as more information becomes available.