Hello Quinn, Thank you for the response. I previously filed a feedback ticket and the app's and macOs .tar.gz and a System_Profile_full.spx. I believe the ticket was FB20989430. This was running 26.2 (25C56). I've had the issue on machines in the field running on 26.0, 26.1, and 26.2. That said, I have found that the bug doesn't reproduce on the 26.3 (a) beta build. I've put this on another mac mini and results so far are positive. I have been testing across three different programs to look for problems. These are the NetworkIssueTest app that I sent you the github project and compiled .app for, our internal software product, and Dan Nagle's Packet Sender (https://github.com/dannagle/PacketSender) I'll work on getting you github link to our internal software. I've been testing this by either creating a persistent netcat listening port ($ nc -l -k PORTNUM) on another mac with a fixed IP or by trying to reach a fixed IP device (usually an ethernet to serial converter or programmable logic controller) with a know open port and fixed IP.

Hello Quinn, It appears that we had not been properly code signing our applications, so I've spent the past month bringing our development environments in conformity and getting our software notarized through Apple. I was really hoping this was the problem and wanted to exhaust it before I came back here. Unfortunately, we are still having this issue. I have two new machines running Tahoe 26.2 that can replicate the problem consistently. They're connected over a manually configured ethernet network (both on fixed IP addresses) via an unmanaged switch. I use netcat to create an opening listening port on one and then copied the compiled version of NetworkIssueTest.app to the other from a flash drive. I get the local network permission prompt on the first time opening the app. If I reboot the computer and restart the app, it appears not to work until I toggle the permission in Privacy and Security. Sometimes it works on the second reboot, but it fails consistently on the third. Let me know if there's anything else I can provide on my end to test this issue. This issue is happening across our software line, including on products that have menu bars.

Hello Quinn, Thank you for the prompt response. Here is a link to the github repo: https://github.com/James-L-Taylor/NetworkIssueTest/ The documentation folder has a zipped and unzipped version of the .app, along with a screen capture showing the problem and the current signing of the app. Thanks, James

I have been struggling with the same Local Network permission issue and developed the same toggling work around. This has been an issue for machines with frequent reboots. I now have a small (>250 line) Obj-C Xcode project that will show the issue. This is a bare bones app that tries to make a TCP connection to a given IP address and port. The first time the app runs, it asks for Local Network permission. It can connect once this permission is granted. After a reboot, I can demonstrate this connection failing repeatedly until the Local Network permission for the app is toggled off and then back on. I've also noticed this behavior with a third party app, Packet Sender.