yuk, it makes me sick thinking of it, I totally rely on network-manger and my pcf supplied my by network admin, outside of tcp tunneling support, its been robust with any app I've used every day from F9->F12. I'd suggest not mucking with the cli and go to network manager and also talk to your network admin about whether they've used fedora to connect, maybe an issue in your pcf file. (unless you're setting some type of Lan to Lan bridge mode, good luck there) if its simple client connect do above.
its far better to plead forgiveness than beg for permission.:D