Issue symptoms
My agents see the below error when they try to sign in to my host-mapped account: yoursubdomain.zendesk.com refused to connect.
Resolution steps
The error yoursubdomain.zendesk.com refused to connect occurs when privacy settings block third-party cookies. Host-mapped Zendesk accounts have the sign-in page URL support.yoursubdomain.com and the base Zendesk page related to the sign-in cookie support.yoursubdomain.com. Some web browsers, ad-blockers, and privacy-related extensions block cookies because of this URL mismatch.
To solve this issue, ensure the browser allows third-party cookies from Zendesk. To allow third-party cookies in Chrome, see Clear, turn on, and manage cookies in Chrome.
If your browser has ad-blockers, turn them off to check if you can sign in. Some ad-blockers have an exception list. If that's your case, add yoursubdomain.zendesk.com to the allow list.
For more information, see I cannot sign in to Zendesk.