Web GUI connection reset through WAN

[teclab]

Hi Folks,

I setup to access the Web Admin page through LAN - works perfect.
The WAN is in public Internet.

I can access the Web Admin page from Internet when using e.g. my mobile phone (which uses the mobile network).
But the weird thing is, when accessing the Web Admin page through my own WAN, the connection resets and looks like in the picture. I am also connecting my notebook directly on the WAN port, and it does not work.

When I access the Web GUI from LAN, but using the IP from the WAN, then it works also.

Zenarmor is turned off. WAN firewall rule is setup for incoming connection to destination "This Firewall", Source "any".

Anybody got any idea?

thx