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

The error occurs when you use 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 steps below to fix error:

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

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

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