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Kill the brackets. Also, make sure the batch file is where your masterserver resides, otherwise you'll be trying to launch a program the command prompt can't find.

Um, what? There's a combination of two things here; firstly the master server is currently down so you can't connect to it. Secondly, SRB2 switches over to a "Christmas" theme during the December month. No WAD file is actively messing with your SRB2, unless you have loaded it yourself.