If you are lucky and they are only blocking the ports, we have the following enabled that you can try connecting through: 1080, 5000, 5555, 6660-6670, 8080
Otherwise, there are also a few java "IRC at work" programs floating around that you can try googling, that may work for you. With these, however, most are designed to display the same IP address for each of their users, and we have a connection cap per IP, so if you get one working you may want to ensure you have another for backup in case one of the IPs already has the max connections, because we will absolutely not raise that limit.
Can't see this sig or sometimes other images? Chrome now default blocks mixed content on secure sites like SWC.
Go to chrome://settings/content/insecureContent and add www.swcombine.com to the Allow list.
If you want. I'm not your dad or whatever.