If I understand it correctly, 17 out of 19 don’t have a problem.
First make sure you have the latest IE/OS patches
Make sure you’ve set up the jre proxy correctly here.
Next determine where your jvm is trying to connect use “netstat -vb”
Some IE versions don’t pass their proxy info back to the OS properly. If you notice the java.exe trying to connect to the website directly, instead of the proxy, try to force it via the “proxycfg” command. First type just “proxycfg” to see if there is anything there. If there is, do a “proxycfg -d” to delete. If not, do “proxycfg -u” to copy IE’s settings or ” proxycfg -p <proxy-server-name>” to add it manually
If none of the above work, you can download the JDK with debugging tools on one of the machines and use it to see what exactly is failing.
Hope this helps.