Thursday, February 7, 2013 - 06:21

Rogue OpenWebIndex Crawlers

One of the servers we care for recently got hit by an unexpected amount of traffic. That was not related to mentioned rogue crawlers. It basically required more power to deal with it. After the refit the server appeared to be back to normal operations. There was no need at that point for special fine tuning...or so I believed.
Thursday, August 25, 2011 - 00:20

Apache bug in range handling has potential to wreak havoc

Current versions of apache have a neat bug in their byte-range handling that has quite some potential to crash a site with minimal to no effort at all. Byte-ranges are a feature of HTTP 1.1. They are used to partially transfer documents. If multiple ranges are requested in a slightly untidy way apache gets out of step big time. A single remote connection with a lousy dsl line can wreak havoc to various degrees on your system. If you ever want to see your load hit the moon give it a try.

There's - as of now - no patch yet. But there're two workarounds.