Linux

Is your network configured to use squid as a transparent proxy ?

If yes, please examine the NAT table on squid. (iptables -t nat -L)

The line that redirects traffic to squid should only catch port 80 packets and not redirect other traffic.

Yahoo messenger uses a variety of ports, none of which is port 80.

For chat ports, check this page:

http://www.chebucto.ns.ca/~rakerman/port-table.html

PS:
Be afraid peers, I am learning Linux! Haha

im using squid (RH linux 9.0) in my proxy server. all our workstations, windows and linux box, are using this proxy without any problem. can u post ur configured squid.conf? (dont include the #commented text)

It all depends on how you are connecting to the internet. Squid is only a proxy server for some of the protocols (HTTP, HTTPS, FTP, Gopher and WAIS) so basically you would be using it for web access. How is your network connected to the internet since Squid will only facilitate web or FTP access ? Now if you are using "No Proxy" as a setting, Yahoo Messenger will try to connect to the internet through the default gateway. This gateway in your case could be a hardware router, a linux system acting as a router or the same system on which squid is installed. The gateway should allow your system to access the internet for Yahoo Messenger to connect to the internet. In case there is a firewall, its better to allow Yahoo to connect through HTTP Proxy since Yahoo Messenger connects to large number of different ports on Yahoo servers.

as said above
squid is only a proxy server, its not a router

you need to configure your linux box for transparent proxy to access yahoo messenger or change setting on messenger.


Regards,
Peeyush Maurya
http://linux-faqs.com/
Optimise Squid : http://www.linux-faqs.com/squid.php
ACL sample : http://www.linux-faqs.com/Forum/viewtopic.php?t=28

http_access deny !Safe_ports
http_access allow all
http_access allow ibm , yahoo ,hotmail, (according your requirments)

Naveed Hussain
Sr.Network Engineer
i2c Incorporated
Lahore Headoffice

Ihave Install RedHat Linux Enterprose 4, how can i configure squid proxy server