• Make sure the hostname of the machine trying to join the domain is unique.
• If it is a recently deployed machine change it's hostname (preferably to it's name in Colama).
• Restart the machine.
• To join the Workgroup COLAMA-WG,
• Right click on 'My Computer'.
• Select 'Options'.
• Navigate to the 'Computer Name' tab.
• Click on 'Change' button.
• Change the existing WORKGROUP to COLAMA-WG.
• Save your changes.
• Restart the machine for changes to take effect.