I've been trying for days to configure an ipsec VPN connection on a USG 100 from a client computer using greenbow's software. Everything worked fine on the old firewall Zywall 5. I've been thru the various guides and examples from zyxel greenbow, but none worked. I've checked all the protocols many times. It seems that I'm missing something. The firewall is already configured for the mail server behind it and it works fine for that purpose.
There is a timout error after 5 retrys on Phase1
Zywall USG 100 firmware 2.20
Greenbow Ipsec software V 2.5.204