When using CODESYS Control for Linux SL on an Edge Computer (such as 752-9401) or other Linux device, you must initialize the user management system with a username and login the first time you connect to the device with CODESYS. If you then forget that login information, you can get stuck - the database will persist even if you remove the CODESYS Runtime from the device and then reinstall it.
If you lose your login info and need to reset the user management, you can do so by manually deleting the UserDatabase, GroupDatabase, and UserMgmtRightsDb files from /var/opt/codesys
If doing so from an SSH terminal, use “ls -a” to view ALL files in the /var/opt/codesys directory. The normal “ls” command won’t do it because the files all start with “.” and therefore won’t initially be displayed.