To use Tech Support Mode:
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Log in to your ESXi host at the console.
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Press Alt+F1 to switch to the console window.
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Enter unsupported to start the Tech Support Mode login process. Note that no text will appear on the console window.
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Enter the password for the root user. Tech Support Mode is now active.
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Complete tasks in Tech Support Mode.
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Enter the command clear to clear the screen of any residual data from step 5. This may be required by your local security policies.
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Enter the command exit to exit Tech Support Mode.
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Press Alt+F2 to return the server to DCUI mode.
To disable Tech Support Mode:
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Connect VMware Infrastructure Client (VI Client) to an ESXi host or a VirtualCenter Server.
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Browse to a host in the inventory list.
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Click the Configuration tab.
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Click the Advanced Settings link.
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Click VMkernel in the left-hand pane.
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In the list of parameters, deselect VMkernel.Boot.techSupportMode.
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Restart the ESXi host. Before restarting the host, you should shut down virtual machines on that host or migrate them to another host using vMotion or cold migration.
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