This method of access is no longer supported. Access should be via the API as per this documentation

Information required:

• URL for login: every ezyvet implimentation has a unique subdomain eg xyzvet,ezyvet.com
• user name: usually an email address
• password: just a normal password

Create the datasource:

Go to the datahub.

Settings >> Datasources and click on the EzyVet button:

Enter the credentials and URL:

If you are having issues after you are connected, follow this link.