@David-TP 

Hi David,

Thanks for your reply.

The current APP version I use (on Android) is 3.2.5 (The latest version available according to Google Play).  I also tried it on an iPad with the latest iPad OS version of the app installed (3.2.6).

I was able to add more rules a month or so ago, but I removed some port mappings because I didn't use them, and I Left only three forwarding rules to my NAS.  Now I want to add some new rules, however it states that the IP address is already in use and refuses to create the mapping.  Changing one of the three existing rules is however possible, and adding port forwardings to other IP addresses is also possible.

In the iPads OS app I get the same error (IP address already in use, but I am asked to make an address reservation for this IP address and I am directed to the address reservation page).  However this address reservation was already made.  I get the impression that the IP address already in use error is somehow generated by the address reservation module.  As a test I wanted to remove the address reservation for my NAS, but however the app doesn't seem to provide the possibility to remove an address reservation.

I sent the App log via the support link you provided.

Kind regards,

Sven Kluppels

  @David-TP 

Update ! I managed to add port forwarding rules now.  As you could see from my former reaction, I suspected it had something to do with the address reservation.  I finally did find the possiblity to remove an address reservation (you must long-press the reservation in the app.  This was more user friendly in the old version of the app (three dots...) ;-) and this did solve the problem.  By removing the address reservation, I managed to make an additional port forwarding, and the app re-added the address reservation (on the same IP address) for my decvice again.  

Thanks for your support.