DRADY  I've used v1.5 and earlier w/o problems on earlier versions of Mac OSX.

BUT ... just used 2.0.3 to defrag on 10.5.3 and had my volume damaged such that if fails Verify/Repair.

Reinstall time ... and pray the backup I took just before the defrag will restore cleanly.  
(Version 2.0.3)

DRADY  External tunnels work for me.

Never had an issue with them with JFVNC since I started using it almost a year ago. Ex:

ssh -XC -L 5903:10.200.20.9:5903 user@some.host.com

Tunnels just fine for me.  
(Version 0.96.36)

DRADY  E_Commerce: are you saying that JFVNC doesn't support tunneling by calling 'ssh -L ...' internally or that it does not support communication across an externally established tunnel?

thanks.  
(Version 0.96.32)