Why page viewer web part is showing error("This content cannot be displayed in a frame") while using external site link in sharepoint 2016 site?

Question

Sometimes ago, it was working properly without doing any explicit configurations like the below in our sharepoint2016 site(https://) But now it is failed to display the external site link content (https://) from another domain.

Part of fixing, have done the below things, but still not able to resolve the issue.

i)added this (WebPartPages:AllowFraming runat='server') inside custom master page. ii)"Permit contributors to insert iframes from any external domain into pages on this site" option is selected under Site Settings > Site Settings > Site Collection Administration > HTML Field Security.

Do we need to do anything else or this feature(displaying iframe is depreciated in sharepoint)..?

Answer 1

You can try adding the below tag into the aspx page which was mapped with the Client Web Part.

<WebPartPages:AllowFraming runat="server"/>

Source:

This content cannot be displayed in a frame

Or,

use <meta http-equiv="X-Frame-Options" content="allow"> in the one to show in the iframe to allow it.

Source:

IFrame: This content cannot be displayed in a frame

If the above solution does not fix the issue, install the "PermissiveXFrameHeader" SharePoint solution and enabling the feature for the SharePoint web app. Please refer to this article Sharepoint: Rendering inside iframes

Source:

How to resolve “This content cannot be displayed in a frame” error - CRM 2013 + Sharepoint 2013?