You might also want to check to see if the people that are running the wireless router have configured it to block IRC ports. While this isn't common for a household, since you have an office to go to for a WEP key, it's possible that they've done that, possibly not realizing that, in doing so, they're blocking part of your access. They may have done so in order to restrict/eliminate the possibility of someone downloading a virus into the host system, and/or preventing a possible hack via the IRC ports.