UltraVNC 1.2.2.4 with uvnc2me 105 on Windows 7 x64

[john jarr]

Hello,
I am trying to control a Windows 7 from another Windows 7: it works over LAN but doesn't go beyond

SYSTEMS:
Windows 7 HomePremium x64 build 7601 on an AMD Athlon X2 and an Intel Pentium Dual Core notebook.

UltraVNC and UVNC2ME:
UltraVNC 1.2.2.4 x64 Setup: Server, Viewer, (yes and also Repeater) on both Windows 7 systems (just to be able to assign server role to either notebook for testing.
Servers are setup as system processes. All default config, i.e. no particular password or port config.
uvnc2me 105.exe on both systems. All router forwarding turnd off.

FW: allow for opening both public and private firewalls OR even turn off FW on both systems.

RESULTS:
1.Works great while both Windows 7 are on the same WLAN!
2. gets only to "Rendezvous" phase on both Windows 7 when we try same config via internet connection (eg OUT via WLAN1 to LTE router to net 80.x.y.z and IN via DSL router on different net and from there to WLAN2). ->>> Both uvnc2me die after some negotiation timeout.

I'd greatly appreciate any suggestion what's missing!
cheers JJ