okay this is some serious problem. i want to revert back to my old IP address. what actually happened is i opened some UDP/TCP ports needed to play fifa 13 online. but that prompted my IP address to change. as a result my device (PC in this case) isn't recognized as a trusted source. so in-game a security question is asked, the answer of which i forgot. after 5 attempts my account gets locked & the only way i can re-access my fifa account for online play is resetting the security question from a trusted console, which unfortunately is my current pc. from what i have found in google is that opening the aforementioned ports causes the IP to change.

so how do i revert back to my previous IP? PLEASE HELP.