I edited the squid.conf file present in /etc/squid/ so that in.yahoo.com and youtube.com would not be accessible. Here is the squid.conf file:

Recommended minimum configuration:

acl manager proto cache_object

acl localhost src 127.0.0.1/32 ::1

acl to_localhost dst 127.0.0.0/8 0.0.0.0/32 ::1

Example rule allowing access from your local networks.

Adapt to list your (internal) IP networks from where browsing

should be allowed

acl localnet src 10.0.0.0/8 # RFC1918 possible internal network

acl localnet src 172.16.0.0/12 # RFC1918 possible internal network

acl localnet src 192.168.0.0/16 # RFC1918 possible internal network

acl localnet src fc00::/7 # RFC 4193 local private network range

acl localnet src fe80::/10 # RFC 4291 link-local (directly plugged) machines

acl SSL_ports port 443

acl Safe_ports port 80 # http

acl Safe_ports port 21 # ftp

acl Safe_ports port 443 # https

acl Safe_ports port 70 # gopher

acl Safe_ports port 210 # wais

acl Safe_ports port 1025-65535 # unregistered ports

acl Safe_ports port 280 # http-mgmt

acl Safe_ports port 488 # gss-http

acl Safe_ports port 591 # filemaker

acl Safe_ports port 777 # multiling http

acl CONNECT method CONNECT

acl block1 dstdomain .in.yahoo.com

acl block2 dstdomain .youtube.com

Recommended minimum Access Permission configuration:

Only allow cachemgr access from localhost

http_access allow manager localhost

http_access deny manager

Deny requests to certain unsafe ports

http_access deny !Safe_ports

Deny CONNECT to other than secure SSL ports

http_access deny CONNECT !SSL_ports

We strongly recommend the following be uncommented to protect innocent

web applications running on the proxy server who think the only

one who can access services on "localhost" is a local user

http_access deny to_localhost

INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS

Example rule allowing access from your local networks.

Adapt localnet in the ACL section to list your (internal) IP networks

from where browsing should be allowed

http_access allow localnet

http_access allow localhost

http_access deny block2

http_access deny block1

And finally deny all other access to this proxy

http_access deny all

Squid normally listens to port 3128

http_port 3128

Uncomment and adjust the following to add a disk cache directory.

cache_dir ufs /var/spool/squid 100 16 256

Leave coredumps in the first cache dir

coredump_dir /var/spool/squid

Add any of your own refresh_pattern entries above these.

refresh_pattern ^ftp: 1440 20% 10080

refresh_pattern ^gopher: 1440 0% 1440

refresh_pattern -i (/cgi-bin/|\?) 0 0% 0

refresh_pattern . 0 20% 4320

After this I restarted the squid server and went to firefox and opened youtube and it opened. Am I doing something wrong here?