If you are trying to use the ms launcher, it doesn't work for this version. I don't see how it wouldn't work if you are trying via srb2win (or w/e OS).
Hm... Try "fixing" the master server location in options. If that does not work, try redownloading srb2.
The code for the master server will be automatically be correct once you download, I just remembered that. >.<
Are there any programs blocking srb2 or something?
The code for the master server will be automatically be correct once you download, I just remembered that. >.<
Are there any programs blocking srb2 or something?