Hm, confirmed, even if I connect to the IP - I have absolutely no idea why this occurs though. Connecting to warped.bluecherry.net with a normal connection works fine, the only thing I noticed is that the server does not appear in /links, only irc.* and services.* do and /motd returns "No such server". This is probably just the IRCd setup rather than the root of the problem though? Does it support other ports? If so, try those.
6.14, XP Pro.