Tracker errors
If you're having problems connecting to the tracker and the tracker URLs in your old torrents use ports 1377 or 6969, you should REMOVE the old .torrent from your client and replace it with a new one that will use the correct (and optional) ports. See MY > ANNOUNCE URLS
Alternatively, you can edit the port in the tracker URL for existing torrents. How you do that depends on your client and you should see the documentation for it or visit the author's support forum for it.
Whatever your client happens to be saying that seems out of place to you such as "Finding peers" or "Connecting to peers" or "turning red", you still have to check the TRACKER STATUS message for that torrent. If you don't know where the TRACKER STATUS message is in your client, FIND IT. This is fundamental information and everyone should know how, where and when to check it. Many times the reason for or answer to your problem can be found there and even if you don't know what it means, it would be helpful to pass on that information to anyone trying to help you.
//staff