Backup or another activity with a VMware ESXi VM fails with the following error:
SOAP 1.1 fault "":ServerFaultCode[no subcode]
"Failed to authenticate with the guest operating system using the supplied credentials"
This article applies to VMware/ESXi. If you encounter the same error on Hyper-V, see How to prepare non-built-in administrator user to be used for application protection on Hyper-V VM instead
Incorrect credentials for ESXi vCenter / host, or credentials have expired.
- Check credentials for vCenter / ESXi host that were specified in console: see Configuring the virtual appliance
- Check VMware KB article 51124