Not connected to any seeds
If the tracker reports that there are seeds, but you aren't connected to any of them, one or more of the following may be true:
- You haven't allowed enough time for the connection to be made. It can take a few seconds to a few minutes for you to connect to a seed after you start downloading. It will probably take longer if you have a NAT problem or firewall problem.
- The tracker is just wrong, there really isn't a seed (anymore) at that IP. Possible causes:
- The seed crashed
- The seed lost its network connection
- The seed just stopped seeding and didn't bother to let the tracker know
- The tracker is buggy and/or hosting Bad torrents
- A Denial-Of-Service (DOS) attack essentially disabled the seed's computer or network.
- There is too much latency between you and the seed to establish a connection before one or the other computer times out and gives up.
- All the seed's available connections are legitimately in use by other peers (that is, the seed is limiting itself to serving N peers and there are already N of them).
- Both you and the seed are behind firewalls or NAT routers and neither of you has set up the port-forwarding correctly.
- All the seed's available bandwidth is legitimately in use by other peers (either the seed is explicitly limiting itself to N kB/sec, has a slow line or its ISP is throttling likely BitTorrent connections).
- The seed has your IP address on his banlist.
- The seed is on your IP banlist
- The seed only allows connections to people with a certain BitTorrent client which you don't have.
- The seed only allows connections to people who have successfully set up port forwarding and/or don't use a standard incoming listen port.
- The seed is in superseed mode. When this is the case the seed will preferentially upload selected pieces to selected peers to maximize the initial distribution of the download. This is easy to recognise: there is a single seed in the swarm and when you look at the peers view you will see almost all of the other peers with the same availability, slowly increasing (at the upload limit of the superseeding peer)
Read the Azureus FAQ