Update not working through proxy.

I have had a Firewall password until recently and I was able run Internet 
updates without a problem. I tried to put another programmer on WDSC and they 
could not update because they did not have a Firewall password. Now I do not 
have a Firewall password and have configured for proxy but I keep getting the 
following messages.

Unable to access "http://support.softlanding.com/updates/";.
  Error parsing site stream. [White spaces are required between publicId and 
systemId.]
  Unable to access Site stream: 
"http://support.softlanding.com/updates/site.xml"; 
[http://support.softlanding.com/updates/site.xml]

I thought it might be a Softlanding problem but it does the same thing with 
every site. I looked through the archives and it look like a lot of people have 
had problems with updates in the past but don't see any solution. 

I download all the updates from Internet that I can but want to be able to 
check for new updates. Also, some sites like Softlanding do not allow you to 
directly access the site. You must go through update to get to them.

Anybody got a solution for this one?