<p>Ok, so as I understand this....</p>
<p>Your local server (Mandriva) is acting as a proxy server, is this correct?</p>
<p>What proxy daemon are you running? What version?</p>
<p>Did you check the configuration of your proxy server software?</p>
<p>It also sounds like all of the Linux-based PCs cannot access the URL while the Windows-based PCs can, correct?</p>
<p>On the Windows-based PCs, are you using Firefox or Internet Explorer?</p>
<p>What version of Firefox are you using on the Linux machines?</p>
<p>What version of Firefox are you using on the Windows machines?</p>
<p>Do you have any Firefox extensions installed? On the Linux machines? On the Windows machines?</p>
<p>Do the Linux and Windows machines have the exact same Firefox extensions installed?</p>
<p>Are all Firefox extensions on all machines at the same version?</p>
<p>Did you modify netfilters via iptables on the Linux machines?</p>
<p>Did you modify the host file on the Linux machines? On the Windows machines?</p>
<p>Did you modify hosts.allow and/or hosts.deny on the Linux machines?</p>
<p>From the Linux machines, can you traceroute to the url's (IPs)?</p>
<p>It is only this one URL that the Linux cannot access, correct?</p>
<p>Is the url to somewhere local on your network? or is ot to somewhere on the Internet?
aka is it an internal or an external url?)</p>
<p>We need more information to properly troubleshoot the issue. A good methodology to follow when it comes to troubleshooting is to follow the OSI Model by starting at Layer 1 and working your way through it until you reach Layer 7. No point in troubleshooting (Layer 4 - Transport) if the cable isn't plugged in. (Layer 1 - Physical)</p>
