Hi,
You can disable it by commenting out the BannepIPBlockingModule from the modules section of web.config
You can also delete banned ip adresses from Advanced Tools Banned IP Addreses to un ban them.
There is an issue where ip addresses get banned automatically when there are pathtoolong exceptions. This was originally intended because often malicious requests throw this error, but it turned out there are ways it can happen accidently by normal use. This will be changed for the next release so it does not automatically ban them.
Hope it helps,
Joe