SQL Navigator cannot update behind web proxy (4225603)

SQL Navigator is unable to check for updates when running behind a web proxy.

1. Open SQL Navigator (do not make any database connections)
2. Go to Help -> Check for Updates
3. Update fails because it cannot get through our web proxy.

I can get to the web site through the links in the Help -> About menu. There is access to the internet. But SQL Navigator does not seem to have support for web proxy configuration, so any attempt the application makes to make a connection outside of our network (the internet) fails.