How to block flash videos / Youtube using Squid proxy Server

Youtube bandwidth eater is a main headache for network administrators . Here you can see how to block Youtube with squid.


The MIME type of youtube video  is "video/x-flv". Creating an ACL to block this is easy.
Modify squid configuration file /etc/squid/squid.conf

add the following lines in the ACL section

First, create an ACL which matches the MIME type in question:

acl deny_rep_mime_flashvideo rep_mime_type video/x-flv

Then create a HTTP Reply ACL which denies any replies with that MIME type:

http_reply_access deny deny_rep_mime_flashvideo

This has been verified to block Youtube flash video
content.

If the content is blocked the following similar line will be seen in access.log:

2282485683.146 903 127.0.0.1 TCP_DENIED_REPLY/403 3143 GET http://td.v17.cache4.c.youtube.com/videoplayback? - DIRECT/208.117.252.164 text/html