I just went through this for my wife’s thin client/Z3 setup her company gave her. I upgraded my spectrum equipment (from a surfboard of my own) to the latest spectrum offered to support higher bandwidth. The Z3 initialized and would allow a WiFi connection (which the Avaya phone cannot do) but would not initialize the VPN over the WAN port. I lowered the default DHCP setting from aggressive to normal, and enable PPPoE Passthrough (only passthrough disabled by default) and everything connected immediately. since it’s working and I’m doing someone else’s job I haven’t gone back and isolated whether the pass through or the DHCP change did the trick. I am an app guy not a networking guy. I only posted here in case it could help someone.
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