NetWorker: daemon.raw shows error: "Unable to get authentication credentials for nsrmmd"

The NetWorker server's daemon.raw has a large amount of error message during backup:

nsrmmd#44 NSR severe The local server was unable to get its own authentication credentials: Unable to find a credential for program 'nsrmmd', daemon ID 390104 and instance number 4405 
nsrd NSR warning Failed to allocate save mmd since it was not started. Reject request id 15443 . 

• Linux: /nsr/logs/daemon.raw
• Windows: C:\Program Files\EMC NetWorker\nsr\logs\daemon.raw
• NetWorker: How to use nsr_render_log to render .raw log files

There are a lot of nsrmmd processes running in NetWorker server with Data Domain DD Boost devices. Some of nsrmmd had timeout and could not be authenticated by NetWorker server.

In the storage node setting, "Dynamic nsrmmds" was disabled.

After enabling "Dynamic nsrmmds" in storage node settings, the authentication error disappeared and backup completed successfully. 

1. Log in to the NetWorker Management Console (NMC).
2. From the Devices tab, go to Storage Nodes.
3. Right-click the storage node that is used by the backup and open the Properties.
4. From the General tab, under Device Management, check the Dynamic nsrmmds checkbox.

The following article also details TCP and OS kernel best practices that may assist with session: NetWorker: Best practices for networking configuration