By the looks of it you have a faulty one. Raise a ticket tomorrow for a replacement. If needed drop me a message ill authorise an advanced replacement.
Panasonic toughbook. I'm looking to do the same with surface 3 ones. So far without a case my 8 yr old hasn't bust it. But the charging is weak as its micro USB only
dmz on most domestic routers forwards everything to that ip. Never a good idea opens up ftp, ssh, telnet etc etc
should never be done and only done when the uneducated thinks it will make it work. It will work but opens up a security nightmare. I don't like port forwarding much less dmz.
not wanting to presume you have a marketing thing going on, btw I got your mail without the sae you promised.
Its a very very bad idea to put any bit of gear in the dmz of most routers.