VMware ESXi 6.7.0: Change password complexity policy
- Login to ESXi console
- Go to Host > Manage > System > Advance Settings
- Search "security"
- Select "Security.PasswordQualityControl"

5. Action > Edit option

6. Change value as you perfer. Example: retry=3 min=1,1,1,1,1
7. Change password via Host > Manage > Security & Users > Users

8. Change user's password.

9. Set "Security.PasswordQualityControl" back to default value.