The following error message is displayed when saving a new or current configuration:
Write failed, file system is full.
Run the following command from shell to display information about total space and available space on the file system:
df -h
In this case the dev\md0c was at 102%. The md0c is a volatile space for the /root directory. Verify if there are any files that should not be a part of /root directory and move them to /var directory.