Sub-domains are not allowed for the parent domain.

When adding an instant alias in Dotnetpanel, you receive the error "Sub-domains are not allowed for the parent domain"

The error occurs when you use a custom domain for instant alias but the domain is not allowed to set up sub-domain.

This is a security feature of Dotnetpanel to prevent domain hijack.

You can follow the steps below to fix the error:

1. Go to Hosting space, check domain in Instant Alias setting

2. Go to Domains and find the domain configured for instant alias

3. Select the domain to bring up management page and select checkbox "Allow customer sub-domains".