VMware ESXi 6.7: Change password complexity policy
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Login to ESXi console
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Go to Host > Manage > System > Advance Settings
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Search "Password"
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Select "Security.PasswordQualityControl"
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Action > Edit option

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Change value as you perfer. Example:
retry=3 min=1,1,1,1,1

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Check for change.

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Try to change password by go to Host > Manage > Security & Users > Users
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Select user "root" > Edit user

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Change your password.

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Set "Security.PasswordQualityControl" back to default value.
Reference:
http://vcdx56.com/2016/04/change-esxi-password-complexity-policy/
https://communities.vmware.com/thread/527843
https://www.perfectcloud.org/fix-it/vmware/disable-esxi-password-complexity/