Unable to log in via website.

Today, my sister had tried to log into Maple via the website so she could buy some NX using google chrome, but it says that the ID/Password is wrong. She tried it with every combination of password it would be , but it didn't work. She was already logged on Maple through the launcher at that time. I then tried on my own computer with FireFox 4, with maple open as well, to log into her account on my own computer - only to see another failed attempt. I still have maple open and I have just tried to log into my account and it says that has failed as well, and I tried one of my mule accounts, and that failed.
Has this happened to anyone else? Do you know any solutions?

Check your caps lock key. Try logging in on Nexon.net not on MapleStory.Nexon.net.

I'm getting the same exact thing on all of my accounts. I'm using Firefox 5 and I can't even get into my hotmail accounts.

I get the same problem with different accounts, different browsers and different sites. I get the following error:

"Sorry, there has been an error. Please try again later."

Edit: After trying for some minutes, I managed to log in. The login servers seem to be slow.

I've just tried logging in via Nexon.net rather than maplestory.nexon.net, it worked. Thank you Tristan.

And if the Nexon.net doesn't work, go to their forums, login and hit "PLAY" in the top right corner