Tracker Returned Error - Unrecognised Host - Log In/Sign Up

Does anyone else have problems seeding? I always get - tracker returned error - unrecognised host - log in or sign up and I only get it with tribal mixes torrents. Using latests Transmission on Mountain Lion but I do believe I had the same issue before updating/upgrading both. How do I sort it?

Thanks

From time to time, yeah. I try a few things, not sure which one works best ... but usually it solves it when I refresh my browser cookies (log in and out of Tribal Mixes) and I shut-down/restart my P2P software a few times.

Yes, if you clear your browser(s) (using a security program or manually, etc.) you will need to exit your torrent client, open your browser, navigate to and log-in at Tribalmixes.com, and restart your torrent client.

I do the above every time I clear my data and it's solved right away.  

Hope this helps.