That happened to my brother today w/ his acct. I notice u put same IP address idea... I wonder if that's why his got "Invalid ID and Password" because
We share an Apartment... Hope His Ticket goes thru and urs also bud
Invalid ID and password means he got the password wrong.
If he got the account wrong he would get a different message (something like "account not found" I think).
If he was banned he would get "Cannot log in using this account"
You may think it's odd that "Invalid ID and password" actually means "Invalid password". You would be right.
It's sort of like SonoV* read a security manual and didn't actually understand any of it, but took a couple of messages that people should see. They then implemented these messages without thinking what they mean.
Enough digression, your friend may need to get his password reset - just make sure he still has the email account that is registered to his AGE account.
* SonoV developed the original game & the login procedure.