NM Fixed.
If anyone else is experiencing this problem, what did it for me was just updating my router's firmware (
www.linksys.com).
EDIT: Actually, I was mistaken. Other users still cannot connect to my server, they get disonnected at character select screen. I've seen this on the boards in a few other spots, but didn't see any applicable fixes, so if someone knows something that may help, I'd greatly appreciate it.
Thanks,
Phaedo