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How to have a sub-domain with it's own password?
To give a user the permission to view the sub-domain content and not your root content, create an FTP account with the same name of your sub-domain.
Example: If you have the sub-domain john.domain.com then you would need to create the FTP account john and everytime john would logs into his account, he would be sends to his sub-domain, and not your web space.
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