NetWorker: Data Domain device creation fails with "'DDBOOST_USER' does not have sufficient access rights."

• You are attempting to create a new Data Domain (DD) device in NetWorker, and it is failing with the following error after entering the ddboost user credentials:  "Unable to connect to 'DD_HOSTNAME' because user 'DDBOOST_USER' does not have sufficient access rights."
• Other devices configured through the same Data Domain are observing no backup, clone, or restore failures.

Update the ddboost user's password from the DD management user interface.

After changing the ddboost users credentials in Data Domain, you must also update the NetWorker devices to use the new password.

Check the ddfs.info log in to the DD for any account-related errors while attempting to create the device:

Or:
NetWorker: How To Collect ddfs.info log from Data Domain

10/16 08:13:58.083 (tid 0x7fd3e02fa7b0): nfsproc3_ostmntsec_3_svc: connection failed permission (corrupted credentials) from host NW_SERVER_ADDRESS - ost_decrypt_mnt_sec_request(): failed to finalize plain text (101077092, error:06065064:digital envelope routines:EVP_DecryptFinal_ex:bad decrypt)
10/16 08:14:01.817 (tid 0x7fd3e02fa7b0): WARNING: Failed to verify the password for user ddboost.  Error is 7:Authentication failure

This error can persist even after password value is updated for the account. It will also likely result in errors when attempting to create the device even if it is the correct account for the storage-unit. A ticket with Data Domain support is required.