Making any changes to main domain hosting parameters overwrites subdomain settings.
For example, main domain configured to use
ASP 4.0, but subdomains have
ASP 4.0 in Hosting Settings for main domain and applying changes will also change
ASP version to 4 on all subdomains.
This is a
Hosting settings are synchronized with subdomains if
Hosting settings management permission is switched off on the subscription.
Enable Subscription > Customize > Permissions > Hosting settings management permission to change this behavior.