What it looks like
A subdomain on your domain has a CNAME pointing at an agilecrm.com target, and loading it returns Agile CRM's unclaimed page rather than a working site. The visible signature is text along the lines of "Sorry, this page is no longer available".
Both signals are needed. A CNAME pointing at Agile CRM is completely normal when the service is in use. It only matters when the target is no longer claimed.
Why it can be taken over
Cancelled accounts release the subdomain association.
What an attacker gets
- Content served from your subdomain, on your domain, usually with a valid certificate Agile CRM issues automatically.
- A phishing address that passes every check a cautious person would run, because it genuinely is your domain.
- Access to any cookie your main site scopes to the parent domain, which can include session data.
How to fix it
Remove the record. CRM landing page subdomains are usually created by sales or marketing rather than by whoever manages DNS.
Full removal steps for any DNS provider are in the dangling record guide.
Stopping the next one
These appear whenever a hosted service is trialled and dropped, so one cleanup does not settle it. The habit worth building is deleting the DNS record in the same sitting as the cancellation, because those are separate actions and only one is on anyone's mind.