I think you can fix it by changing the server id in settings.ini
http://mc.kev009.com/Protocol
The default server ID is MCServer I think, which is 8 bytes I'm not completely sure about this though
http://mc.kev009.com/Protocol
Quote:Client gives invalid server key when authentication hash is 8 bytes and the first byte is > 0x80
The default server ID is MCServer I think, which is 8 bytes I'm not completely sure about this though