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I have the following configuration:


The default rule "Local traffic"is active.

A client with IP has a WebInterface on Port 15767 as https.

This port is only accessible in his own Lan2, but not from Lan1 or VPN.
Ping and other ports are available.

But when I do a single ping into the internet (ping or trace route) from this client, the port 15767 is accessible from all Lans.

All other services like mail, ftp, etc. are available from all Lans.

Is there any setting in the FW which prevents the port 15767, without a first access from this client to the internet?

I cant find any hint in the logs and tried to switch of IPS, Anti-Spoofing, Web-Filter, etc.

Many thanks

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I solved the problem by myself
But maybe this will help someone else in the future:

The device with IP was registered without a MAC address at the firewall!
With the first access to the firewall (e.g. ping) the device sends its MAC and is fully registered.

Now I have setup that device to ping an external address every few seconds and everything is fine.

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