Did you set up port forwarding within your router, or did you just check the button within LW's firewall config? Did you set up a static IP address first? If not, your port forwarding won't work. There are very good instructions below
http://www.portforward.com/english/r...2/Limewire.htm

If your ISP's traffic shaping, it doesn't necessarily mean that you can't connect... means that your bandwidth will be shaped & so your download speed will suffer but many people are still able to connect ok. Try going through the portforward.com instructions (if you already haven't) & just choose a higher port instead of the default 6346 (even though it's not blocked). Going to a higher port is about the only thing that may make a difference if an ISP's shaping. You could check with Atlantic & find out whether they only apply shaping at certain times... some ISPs only do this during their "peak" hours.

Ok that was helpful advice. I followed the portforward.com instuctions and that seemed to go pretty well. Also I sellected a higher port number but I am still unable to connect. I think I will try calling atlantic broadband tomorrow to see if they can help. I feel like I have everything set up correctly now so i have no clue what else to do.

You do still have your LW set to connect at startup, don't you (tools > options > connections)? Have you tried the old faithful file > connect?
Just in case, for some reason, your preferences have not stuck

Yes It is set to connect at startup and I have tried file>connect

Also the Firewall Icon is displayed in the bottom lefthand corner even when i dissable the firewall. Does that mean anything?

Yeah sorry, just that sometimes preferences do strange things. Let us know how things go with your ISP.

yeah I have one other PC at my house with limewire and it stopped connecting too. I havent tried messing with the settings on that one at all yet. Also I know of one other friend of mine who has Atlantic and he was unable to connect either last time i checked.

Found this on Google, as I said before it's about shaping rather than blocking but maybe things have changed in the last few months. This is from March this year:
http://www.atlanticbb-sucks.com/

It's definitely worth calling them & finding out if they've started blocking. If you could post what they say back here, it will help out other Atlantic users who are having problems!