Fix for tracker.openbittorrent.com
If you download public torrents, you're very likely to be familiar with OpenBitTorrent. It's among the most popular open trackers, and for stuff older than a few years, often the only one still online. However, as of a few months ago, it has been plagued with chronic downtime and timeouts. The reason is that while their hostname has 7 A records, only 3 of those are actually operational.
Fortunately, there's an easy fix for this. Open the hosts file for your system and append one of the following lines (not all three, just one; pick any at random).
Code:
45.154.253.8 tracker.openbittorrent.com
45.154.253.9 tracker.openbittorrent.com
45.154.253.10 tracker.openbittorrent.com
Then flush the DNS cache or just wait long enough, and everything should work fine again. Note that if they ever switch addresses in the future, you will need to edit or remove the entry.