The Linux Page

Hacker's bot did an explicit QUIT... Ha! Ha! Ha!

I found the following in my logs, and thought it was very funny:

198.20.87.98 - - [22/Dec/2015:21:43:42 -0800] "GET / HTTP/1.1" 444 5666 "-" "-"
198.20.87.98 - - [22/Dec/2015:21:43:42 -0800] "GET /robots.txt HTTP/1.1" 444 5666 "-" "-"
198.20.87.98 - - [22/Dec/2015:21:43:42 -0800] "GET /sitemap.xml HTTP/1.1" 444 5666 "-" "-"
198.20.87.98 - - [22/Dec/2015:21:43:58 -0800] "quit" 405 5461 "-" "-"

The person who wrote this robot is not sending me who he is (last "-" is expected to be the name of the robot or the client's browser.) So as you can see, I return 444 as the answer. Just to annoy them. The 444 is used by Ningx as a "no response" type of response. It is not a legal HTTP response, but I like to use it to clearly distinguish certain errors I get. In this case, it is returned because the robot is attempting to access my website with a Host defined as an IP address instead of a (valid) domain name.

But what I find really funny is the QUIT command at the end. It is NOT a valid HTTP command. My server does it right, it actually returns a 405 (Method Not Allowed) error code. I just thought that was funny. I suppose some HTTP applications (such as DAV) may support a QUIT command.

Interestingly enough, this seems to be a sane (non-hacker) search engine that tries to see whether your website is an application offering certain things like a refrigirator (?!?) or a webcam.

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    The action of restarting a computer is called reboot. This reloads the operating system and your different auto-start software.

    There are two types of reboots: a cold reboot and a warm reboot.

    The cold reboot is the one where you turn your computer all the way off and back on. It is considered to be the ultimate reboot which ensures that everything is alright.

    The warm reboot is when you just reboot your operating system. This means some of the hardware parts may not be fully reset as expected in a cold reboot. There are several reasons for this, at times the BIOS of your system does not give the correct signals to all the parts, and at times the signal doesn't propagate to all the parts as it should.

    This is why a warm reboot does not always work (i.e. think when you change a driver and the new driver is not able to properly reset the state of a board or chip... turning the computer all the way off and back on may resolve the problem.)

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