You got this on our server? Have you tried again? 23502 seems to be a temporary error caused by a server fault. All 23XXX codes not having a "9" at the third digit are a problem with the login server.
I got this on CTGP's latest version (So yes, it was on your server). I tried it again just a moment later. I'll try again later today.
EDIT: I think it's because Wiimm is doing his maintenance stuff.