You can set up all targets to receive the same CHAP name and secret from the iSCSI initiator at the initiator level. By default, all discovery addresses or static targets inherit CHAP parameters that you set up at the initiator level.

The CHAP name should not exceed 511 alphanumeric characters and the CHAP secret should not exceed 255 alphanumeric characters. Some adapters, for example the QLogic adapter, might have lower limits, 255 for the CHAP name and 100 for the CHAP secret.


Launch the vSphere Client and log in to a vCenter Server system.

  • Before setting up CHAP parameters for software or dependent hardware iSCSI, determine whether to configure one-way or mutual CHAP. Independent hardware iSCSI adapters do not support mutual CHAP.
    • In one-way CHAP, the target authenticates the initiator.
    • In mutual CHAP, both the target and the initiator authenticate each other. Use different secrets for CHAP and mutual CHAP.

    When you configure CHAP parameters, verify that they match the parameters on the storage side.

  • Required privilege: Host.Configuration.Storage Partition Configuration


  1. Access the iSCSI Initiator Properties dialog box.
  2. On the General tab, click CHAP.
  3. To configure one-way CHAP, under CHAP specify the following:
    1. Select the CHAP security level.
      • Do not use CHAP unless required by target (software and dependent hardware iSCSI only)
      • Use CHAP unless prohibited by target
      • Use CHAP (software and dependent hardware iSCSI only). To configure mutual CHAP, you must select this option.
    2. Specify the CHAP name.

      Make sure that the name you specify matches the name configured on the storage side.

      • To set the CHAP name to the iSCSI initiator name, select Use initiator name.
      • To set the CHAP name to anything other than the iSCSI initiator name, deselect Use initiator name and type a name in the Name text box.
    3. Enter a one-way CHAP secret to be used as part of authentication. Use the same secret that you enter on the storage side.
  4. To configure mutual CHAP, first configure one-way CHAP by following the directions in Step 3.
    Make sure to select Use CHAP as an option for one-way CHAP. Then, specify the following under Mutual CHAP:
    1. Select Use CHAP.
    2. Specify the mutual CHAP name.
    3. Enter the mutual CHAP secret. Make sure to use different secrets for the one-way CHAP and mutual CHAP.
  5. Click OK.
  6. Rescan the initiator.


If you change the CHAP or mutual CHAP parameters, they are used for new iSCSI sessions. For existing sessions, new settings are not used until you log out and log in again.