Symptoms
Domain hosted in Plesk or Plesk IP address has an error while accessing it:
Deceptive site ahead
Cause
The domain is recognized as not trusted by Google Services.
Resolution
Check the domain for malware and malicious scripts.
More details in Google's security guidelines: Manage warnings about unsafe sites
Note: Contact the service provider that owns the IP address and ask them to clarify the situation and exclude it from Microsoft and Google untrusted lists.