While backing up eDirectory, NDS Error: Connect to NDS server failed might display. This might be caused by eDirectory listening on a port other than the default port 524. At the command line, enter the port number that eDirectory was configured on. For example, if eDirectory is configured on port number 1524, enter the following:
ndsbackup sR 188.8.131.52:1524
In eDirectory 8.8 and later, while you back up the data, NDS Error: Requires a Password might be displayed. This is because the server might have attributes marked for encryption and you might not have used the option -E to encrypt or decrypt the backup data.