It could be that the college network is blocking IRC access, in which case your legal alternatives are:
1) Talk to the IT department and enquire if they are blocking IRC access, and if so, ask them how you can access IRC without breaching the terms of your usage of the college's computer network.
Note: just because you're using your laptop does not mean that you are not using the college's computer network and/or internet access points.
2) Find a location that is far enough away from the college's network that you are able to connect.
If the IT department states that they are not blocking IRC access, then it could simply be a matter of the server having too many people trying to connect at the same time, and you happen to be one of the people that got the refusal message.
I have seen this happen even with DSL and cable connections, and has nothing to do with the fact that you're at college.