An administrator is trying to configure Mutual CHAP on a Linux guest.

Mutual CHAP(Challenge-Handshake Authentication Protocol) is used in Nutanix Unified Storage for secure two-way authentication between an iSCSI initiator (client) and the target (VG in Nutanix).

For successful mutual authentication,both the client and the target must use the same CHAP secret:

The initiator uses this secret to authenticate the target.

The target uses the same secret to authenticate the initiator.

The NCP-US and NUSA course materials clearly state:

“Mutual CHAP requires the same CHAP secret to be configured on both the iSCSI initiator (client) and target. Mismatched secrets will result in authentication failures.”

In this scenario, the error is because the secrets do not match. Setting thesame password on bothresolves the issue.