Nighthawk M1 (MR1100EUS) DMZ not working on latest firmware (again)

I am just pasting my previous issue repot as its the same again...DMZ not working...and even worse no port forwarding at all

Could you please check again.

firmware: 12.06.12.00

Thanks

Thomas

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Dear Netgear Support and others trying to help :-)

I am running the MR1100 with a public ipv4 address associated to a dyndns record but DMZ enabled does not allow any access on any service hosted behind the MR1100. When enabling a single port in port forwarding (e.g. port tcp 22) then I can access that 1 service from external but this is not the intention when using a DMZ.

I have already reset the device once using the webui but might wanna do it again using the hardware button.

Any other ideas?

And please note that I am IT professional so do not botehr me with the usual "Hav you tried to turn it off and on again" replies.
Thanks so much

Thomas