Blocking messenger and porn sides

[nikkukhosla]

Hi  
Linux Gurus (Experts)
I have a problem
I m using linux 9.0 with squid and providing internet to the sudents but the problem is that
some student miss using that.
 They use messenger and open some porn sides. I m using default port no. 3128 for providing service
Pls help me and tel me how could i block the messenger and porn sites cause if i block 3128 port they cant access internet. :shock:  :roll:

[Ricky]

Kindly look previous posts in the forum.. This has been discussed many times. Use search at bottom to look for post from LS

[asimbutt]

block yahoo messenger