How to change the network interface for AXC F 3152 for programming

Hi all,
i am trying to flash a new Project on a PLC that already exists in my network. Its an AXC F 3152 with Firmware version 2025.0.3 (25.0.3.103). Network Port X1 is the one i would like to program the PLC with. I can reach the PLC with WBM, HMI and SSH no problem. But when creating a new PLCnext Engineer Project (created with 2025.0.3 and also tested with 2026.0) the Project defaults to trying to program the PLC over Port X2. Thats not possible for me because our Profinet Network is seperate to everything else.
In the Cockpit tab in my PLC device i can apparently change the interface which is used but i think it does not change anything. Connection attempts end with unable to reach. If i press the HMI or WBM Button in the same tab everything works as expected. I think the Network Dropdown is broken because when scanning for online devices it scans for Port X2 not X1 even when that is selected. In the past i got told to change the Interface, save the project, close and reopen. That did work for a while but now it seems to have stopped.
Can anyone offer an idea on what to do?

Best regards
Simon Schackmann

Update: i created a new project on an older Laptop with PLCnext Engineer 2024.0.4, flashed it once, copied the project over to the new laptop and continued working there. That worked just fine. What am i missing here?

Hi,
You can select which interface should be used for communication:

Best regards
Lennart Durth

Hi Lennart,
thats exactly what i did! But thats the function i described as propably broken because it did not change anything.

Best regards
Simon Schackmann

Hi Simon,
as a workaround you could try to use the Ad-hoc IP address option. I use it frequently on my AXC F 2152 (never tried it on an AXC F 3152 though).

BR
DivisionByZero

Hi DivisionByZero,
thanks for the idea didnt know that function yet! Sadly that does nothing either… Currently my only option to create a new project seems to be creating it on another device and then transferring it over…