Constant disconnection after I log on?

Every time i log on the first time i successfully get on, but when i log off to change my character (i have a lot, seriously), i type in my pw and click enter, then maple crashes and says u have disconnected. I reopen maple and try to log on and it says the same thing. i have to reinstall maple everysingle time i wanna play and its starting to get on my nerves. any suggestion? (sorry if this is in the wrong section)

Disable your firewall and then try again.