Well, without knowing the proxy that is being used, I can only help so much. It would appear that port 2064 is closed though. I monkeyed a bit with mine to see what the ini file would look like when changing around some of the settings.
Under the networking heading in the dnetc.ini file, try inserting the following:
[Networking]
keyserver=24.248.233.118:80
nettimeout=5
autofindkeyserver=no
firewall-type=http
nofallback=true
Also, check your browser settings to see how you are connecting to the internet. For IE 5 and newer, it is under Tools-Internet Options, the click the connection tab and click the LAN settings button. That should give you the proxy settings. Let us know what they are, and we will try to give you the settings you need to have in your ini file.
If you get that one working and have full admin rights to all the machines, there is a program called "remote cows" that you can use to administrate/install all the rest of the machines, provided they are in the same domain/workgroup.
Hope some of this helps.
SD