If the ntopng service crashes with a segmentation fault, there is a bug in the software which must be fixed.

Before opening a new issue, please ensure that you are using a recent (ideally the latest) ntopng version. In order to speed up the troubleshooting process, a stack trace of the crash is needed.

Linux

An easy way to get a stack trace on Linux is to run ntopng through the gdb debugger:

1. Ask to the ntop team a binary with debug symbols, specifing ntopng version
2. Install gdb (e.g. sudo apt-get install gdb)
3. Stop the running service: sudo systemctl stop ntopng
4. Start gdb: gdb --args <downloaded binary path> /etc/ntopng/ntopng.conf
5. Execute handle SIG33 nostop noprint pass and handle SIGPIPE nostop noprint pass
6. Execute run to start debugging ntopng
7. Wait for the crash to occur
8. Now run bt into gdb to get a stack trace of the crash
9. Send the bt output to ntop team

Windows

The WinDbg tool can be used to get a stack trace on Windows:

1. Download and install WinDbg Preview: https://docs.microsoft.com/en-us/windows-hardware/drivers/debugger/debugger-download-tools
2. Stop the running service: C:\Program Files\ntopng\ntopng.exe /r
3. Open the WinDbg debugger and load the ntopng executable
4. Run the g command to start ntopng
5. Wait for the crash to occur
6. Now run k to get a stack trace of the crash

See https://docs.microsoft.com/en-us/windows-hardware/drivers/debugger/getting-started-with-windbg for more details.