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On two of the Macs, as soon as I fired up the Citrix app, the Java vpn window would show 'error'. Then I remembered that I had done some Java development in the past and installed various jdks from Oracle so I ran: That was on the working Mac.
Then I remembered the difference between 'System' Java, Java plugins, and Java development kits.
For Safari, enable the Develop Window and use an option in there that works. [crarko adds: I don't have an older system active at the moment to try this.
It's inevitable that older software becomes obsolete, the same way older hardware does.
Simply put, you can have multiple versions of Java in different places.
What was happening on the not-working Macs was that the jdk versions were being used, and the Juniper vpn client won't work with them.
I'd also like to understand why this works and why the problem even exists.
They say it's not a bug, it's by design here, even though Google's support page says it accepts Safari 4 as a fully supported browser.