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Hi Stun Wonder
There is a problem with the login sevrers preventing some players from loggin in. Jagex are aware of the issue, have identified the cause, and are working on a fix.
Hopefully it won't be too long before it's working again.
I guess it's going to sound much the same as the post that 2_Tron shared, but they now have a dedicated news article on the RuneScape website about this issue:
"Hi Scapers,
We're aware of an ongoing issue causing some players to be unable to login to the game.
Our team have been working hard to get this resolved as soon as possible. We'll keep posting all the latest updates on the situation in this news post.
While various potential workarounds have been mentioned in the community, we want to stress that we highly recommend you do not remove any form of account security (including authenticators). We have verified this is not the root cause of the issue and you should not compromise account security.
Thanks for your patience. We'll get you playing as soon as we can.