Can't play after moving to different residence

Hello,

I started playing FFXIV at home with a wireless Verizon connection and everything was great.
Then I moved back to my apartment for school and brought the same computer I was using at home with me. Since I moved back, I can't play at all. I'm using Comcast instead of Verizon. Originally I was getting 2002 errors and couldn't even get to the character select screen. Then I forwarded my ports, and could finally sign in. I was so happy, until I noticed no one except me was moving. After a minute of running around, I get booted out with that pesky 90000 error.

I've been trying all day and the same thing just keeps happening. I've tried resetting my router, forwarding ports... I'm not sure what else I can do. My internet signal has been spotty... I know I need to fix that too but I will get fairly long periods of time (like an hour or so) where all my webpages load just fine but FF still acts the same.

I'm sure it's your internet. You should try running a speed test on your computer first to see your up/down speed and then consult with your IP. You might have a crappy speed with Comcast and they might not be delivering what you think they are. I've heard ALOT of complaints in the past from Comcast customers even on console play.

90K (disc) paired with 2002 (Lobby Server Error) was my Problem when my ISP f'd up my Connection.

I'm now sure it's entirely my ISP's fault. Last night when my internet was acting fine, I could play without any lag at all.
Now my net is acting funky and I can't play again. I wish I could bill Comcast for all the days I'm missing. >:/

Had a feeling it was just the net but wanted to make sure. Thanks for the clarifications.