Have successfully read through all 33 pages of posts on this thread, and need some ideas or suggestions.
Just received my MicroCell and cannot get it to work in my DMZ. Works fine in priority mode, connected directly between Comcast cable modem and my firewall, so physical location and outbound IPSEC is not an issue. Firewall is a Fortinet Fortigate, and opened up the DMZ (WAN1->DMZ accept all, DMZ->WAN1 accept all), forced MTU on both DMZ and WAN1 interfaces to 1492. Tested traffic both directions on port 80, no problems, figure it is something with the IPSEC to AT&T. Unfortunately, the Fortigate will not sniff packets through it, so don't know where the failure is.
On a side note, a post or two asked about the external antenna. Do a Google search on Garmin MCX antenna and you'll find one. Note that the connector on the MCell is an MCX female jack. If you want to be creative, try a MCX - BNC adapter and make your antenna! I have an older Gilsson MCX amplifier antenna that I used to use with my Palm GPS and the antenna works great with the MCell...allows me to put the unit on the floor!
Thanks for any suggestions on the firewall issue.