If you can't suddenly log into your account I'd suggest taking a look at the account section of the website to see if the accounts been banned. As we can't do anything about it via the forums.
When the day becomes the night and the sky becomes the sea, when the clock strikes heavy and there’s no time for tea; and in our darkest hour, before my final rhyme, she will come back home to Wonderland and turn back the hands of time.
@ Weak S0ul - I'm sorry, but that is not an issue that we can help you with on this thread, which is for getting help with issues related to the Forums.
I can't tell from your description here what sort of issue this is.
If you think it is an issue related to your computer or the client, then creating a new thread in the
Community Led Technical Support Forum
would be the best way to find assistance.
If you think the issue is more likely related to your change of IP address, that would seem to be more of an account issue, and the
Community Led Account Help Forum
would be the best place to post for assistance.