After a few days of coding in C#, I finally got a mostly working ICQ server solution that relies on ClientLogin to provide Authorizer services to old ICQ clients and a BOS server for them to connect to, which allows them to login. I was considering either hosting this on a single instance or making it a program that acts as a local proxy, but then @TReKiE offered me hosting from one of his servers to assist me for the time being. I accepted his offer, and now you can hook up older ICQ versions to the server to get them working again. Note that at this time, this server only supports versions 2000 - 2003 and 5.x. However 6.x doesn’t seem to log in with this solution at the moment (it uses channel 0x02 authentication, which I haven’t implemented yet), and 7.x and 8.x use ClientLogin.
Anyways, to connect to this server, here’s the information that you’ll need to connect:
Afterwards you’re pretty much sold. Have fun, and see you on ICQ.