Thank you offering your help.
I will try to answer the questions:
What kernel and build of zeroshell are you using?
I’m using standard CD-ROM version of ZS 1.0 beta 11
What is the manufacturer and model number of the NAT router that zeroshell is behind?
It’s a Samsung SMT-G 3210 Phone WLAN with fw 3.01. AFAIK it’s using a linux 2.4 kernel
What ports are being forwarded to zeroshell(1723,500,4500)?
I’m forwaring UDP traffic of the following port: 500, 4500 and 1701 (I’m using L2TP not PPTP)
What IP traffic is being allowed thru the firewall to zeroshell (ICMP,GRE)?
I don’t understand this question, sorry.
What features on the NAT router are enabled such as PPTP,L2TP,IPSec Pass-thru?
I doubt that the stupid Samsung is offering anything like that.
Have you attempted to connect from the LAN to verify that you can even establish a connection locally?
I’ve tried this on both ends of ZS:
It fails if I connect to 192.168.XXX.XXX (the side that’s connected to the outside.
I have a successfull connect if I connect to the 10.XXX.XXX.XXX side of my ZS.
Thank you for reading all this 🙂