Hi there I'm having a few problems after upgrading from 3CX Phone system 8 to 9. Current Setup: 3CX Phone System 9 running on Windows Server 2008 (Win Firewall disabled) Firewall - Cisco ASA 5055 From my current (Static) WAN-IP to the server all ports through the Cisco firewall are open. Local PC has no software firewall Local PC is connected to internet on a static WAN-IP via a NAT router. All outbound ports are open. NAT will allow inbound replies. I am trying to configure the 3CX VOIP Phone to connect to our new 3CX Phone system 9 installation. I installed the softphone from the provisioning URL sent out by the PBX (and 3CX Assistant). 3CX Assistant connects ok with the following settings: Use provisioning URL: NOT CHECKED Local Server host/ip: our servers local IP on it's LAN Public server IP/host: works with both a domain name and the WAN-IP of the server Use Tunnel: NOT CHECKED If I tick to use the provisioning URL it will not connect via the tunnel! 3CX Phone connected ok once without using the tunnel and I was able to get audio in both directions but after closing the application and opening it again it now will not connect.. I took a screen capture of the working settings before restarting the app and no settings have changed yet it now will not connect. 3CX phone attempting to connect via the tunnel fails with "Status 408" I am literally tearing my hair out here... can anyone help me please?