Dell Unity: Receive Error Code "0x6400b88" after a Password Reset with the NMI Button

Summary: After the admin and service passwords are reset using the Non-Maskable Interrupt (NMI) button, and Unisphere is accessed, the user is prompted to change the password. A message window with "Error Code: 0x6400b88" is displayed. ...

This article applies to This article does not apply to This article is not tied to any specific product. Not all product versions are identified in this article.
Check out other resources

Symptoms

After following the process to reset the password with the NMI button, accessing Unisphere receives a request to change the password. You cannot change the password in Unisphere. After entering the password and providing confirmation, a message window appears: "Customer may not log in using SSH (the default password does not work)."

Cause

Management Service (ECOM) in one of the Storage Processor's (SPs) is not responding. Perform a physical ECOM failover, and then try to connect using SSH.

If a user tries to connect in Unisphere, they could receive the same message.

Error code message 

"Message window Error Code: 0x6400b88"


When the service password is changed, a message is received that the other SP is unavailable.

Console output of error message 

SSH message: "Peer password changed once the SP reboots into Normal Mode."

Resolution

Sequentially reboot both SPs, then run the command again to change the password using SSH.

If this does not resolve the issue, it may be necessary to perform a full shut-down.

Affected Products

Dell EMC Unity
Article Properties
Article Number: 000365604
Article Type: Solution
Last Modified: 20 Oct 2025
Version:  2
Find answers to your questions from other Dell users
Support Services
Check if your device is covered by Support Services.