Locked myself out, need help to get back in

I don't have an answer for you, but to be clear, you mean you can no longer access the firewall via the web interface, but you do have direct console access (or SSH or something)? So you're basically asking for a CLI-based way to de-active a NAT rule?

Hi Wayne, thats exactly what i'm looking for.
Thank you for clarifying that.

Do you have Central activated? Central should be still possible. 

Hello Tony, no I am a home user 

Home can also integrate to Central without any problems. Central is for free in a base version (Simply start a trial and let all licenses expire, Wireless and FW Management will still stay). This would help in such situations. 

But to get access to the firewall, you would have to manipulate the database to get this NAT rule out of play. Let me think about this. 

Thank you.
Thinking about it, i have a recent backup.
Can i restore this from CLI?

console> system appliance_access show|enable|disable

It should help. For more information visit: https://support.sophos.com/support/s/article/KB-000038694

Hi Marek,
Thank you, but as far as i can see it doesn't solve my problem. I need to disable a NAT rule to re-enable contacting the management web site.

If nothing seems to work i see no other option than trying resetting through the CLI and then restoring from a recent backup.

Did you try to enter the above command and access the Admin Portal (Web GUI) to disable the NAT rule?

Thank you for your suggestion, just registered and added my FW tot Sophos Central.