Problem solved. Below is the steps that I followed:
I went to this website (who also claimed to have similar problems): http://mis-helpdesk.eq.edu.au/redhat.htm >From the MIS-Helpdesk Site: "A zero sized reply can be returned for sites that have complex urls or require the use of cookies (Eg. hotmail and yahoo webmail sites). In order to prevent this from occurring a new version of squid will have to be installed which has a patch to alter the requests squid makes." I downloaded and installed the squid-2.5.STABLE3-20030613.3.i386.rpm, adjusted the number of dnsservers in the squid.conf file, and symlinked the files in /etc/squid/error to English. Went to hotmail and successfully logged in. This appears to also work for mapquest.com. I have yet to test yahoo mail but I presume that any patch that was added fixed the complex url/cookies problem I was having with squid. There was no additional changes required on the client site. If anybody has any additional questions, I would be happy to assist. Regards, Trevor.
