hmm, testnew.tribalmixes.com looks interesting, a little too much on one page perhaps. As to rendez2k problems, might need to check routings and IP addys are done correctly, cos those screenshots just do not look right at all. good luck in figuring it all out!
also, do you have any problems downloading torrents directly to your home computer? have you tried? to do it directly without seedbox? also generally speaking all torrents have mixcloud previews and direct download links from zippyshare and turbobit. that can help while we figure stuff out..
i dunno why this happens bro... did you try to use tribalmixes.com without www? maybe something there is wrong... can you try access testnew.tribalmixes.com ? do you maybe have on your box an equivalent of "hosts" file in windows, where you put specific IP address for the site? so maybe that IP is incorrect? can you do traceroute www.tribalmixes.com in SSH on your seedbox and post what it says? the easy way to use passkey is enable it in your account... that should generally solve every problem, but in your case it seems like your box doesn't see tribalmixes.com..