Zen 6.5
Netware 6.5
Windows XP SP2 - firewall disabled

I set up a simple app object to map a drive and run RCONJ.exe from the
server. Unfortunately, it doesn't work. When I click on the icon, the
program does not load and I get no error, or occasionally a "cannot find
main class" error.

From looking at Explorer when I click on the icon, the drive is getting
mapped and then immediately unmapped. If I click on RCONJ.exe via
Explorer, it starts right up.

What would cause the drive to immediately unmap?