Smarty:
Going back to my previous reply to you, there is an email address you can use to inquire or ask why your address has been g-lined.
email
abuse-exploits@undernet.org with the ip in the subject, and ask why you got gline, maybe its your ip class, or something..
Further reading on the undernet message forum, you could be g-lined due to unknown spamming and virus's.
I would suggest performing the following in safe mode.
Virus Scan
Spyware Scan
Then try connecting to the undernet again. If that fails, email abuse services of undernet and request why you're IP address has been banned. Just remember to be polite as you will get better results that way. Undernet service is not a right, but a priviledge.
Mark