i tried pinging pandora.bounceme.net and also receive the same error you are, request timeout, meaning no data is getting through to that specific ip.
i thought panda might have posted somewhere the sclientinfo for the server in case people were having trouble connecting, but i'm not sure. you could always try extracting the sclientinfo file from hero.grf using grf tool and put it in a data folder to see if that would make it work (that shouldn't be the problem as the hero client should automatically detect that file in hero.grf), but maybe panda could give you a different ip address to try connecting with.
also, though i doubt this is the problem as you said you could log on to the control panel just fine, make sure that the _M/_F from registration is removed if you registered using the client. not sure if you can use the CP to register or not or the main webpage for that matter.
