Ralph,
I’ve done modify host file on both server, MBG and Micollab , and from SSH instance, both resolve the name to same IP destination.
Lan side i have Ping responding, DMZ side none. I will talk to network admin next week to check if there is an issue in path.
As MItel tech confirm, i need only 443 to authentification WAN side and 36006 on application web proxy.
Thx. Dan