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ArticlesALL: Error Message "refused to connect" Displayed in the Frame of Visualforce Pages After Enabling My Domain

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ALL: Error Message "refused to connect" Displayed in the Frame of Visualforce Pages After Enabling My Domain

Changes in Google Chrome browser releases 80 and 84 may cause a "refused to connect" error message to appear within the iframe of Visualforce pages. This is due to new behaviors related to SameSite and third-party cookies that can break cross-domain communication. To resolve this, whitelist the new domains for both Lightning and Classic in the Session Settings. If the issue continues, adjust clickjack protection settings or Chrome's cookie settings to allow all cookies.

  • Sep 18, 2023
  • Knowledge

Title
ALL: Error Message "refused to connect" Displayed in the Frame of Visualforce Pages After Enabling My Domain
URL Name
ALL-Error-Message-pse-na82-visual-force-com-refused-to-connect-Displayed-in-the-Frame-of-Visualforce-Pages-After-Enabling-My-Domain

Release Version
Symptoms
  • Receiving an error message that the server refused to connect when accessing a Visualforce page(s)
  • Error message is displayed within the iframe of Visualforce page, rather than the entire web page.
Resolution
  • Whitelist new domain for both Lightning and Classic
    1. Go to Setup > Security Controls > Session Settings
    2. Scroll down to the 'Whitelisted Domains for Visualforce Inline Frames' section and select Add Domain
    3. Add the Domain for Lightning (i.e., "https://exampledomain.lightning.force.com ")
    4. Click Save & New
    5. Add the Domain for Classic (i.e., "https://exampledomain.my.salesforce.com ")
    6. Click Save
  • If the issue persists after whitelisting the domain for the Visualforce iframe, ensure that Enable clickjack protection for customer Visualforce pages with standard headers is "false"
    1. Go to Setup > Security Controls > Session Settings
    2. Scroll down to the 'Clickjack Protection' section
    3. Uncheck the box next to Enable clickjack protection for customer Visualforce pages with standard headers
  • If the issue still persists after the above steps have been done:
    1. In Chrome, go to Settings.
    2. Search for Cookies in the search bar along the top. 
    3. Click on Cookies and other site data.
    4. Ensure that third-party cookies are not blocked, click Allow all cookies.
Cause
  • Google Chrome Browser release 80 has implemented changes to SameSite behavior that may break Salesforce cross-domain communication, and integrations iframes.
  • Google Chrome Browser release 84 has impacts on Third Party Cookies, which has a negative impact on visualforce pages in Salesforce.
Additional Notes
Customer Success CloudFinancial Management CloudProfessional Services Cloud
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Knowledge:ALL: Error Message "refused to connect" Displayed in the Frame of Visualforce Pages After Enabling My Domain