How to resolve cross-origin frame loading on Chrome?

Question

iframe loading is failing for my site in Chrome, but working fine on Firefox.

PFA for snapshot for the error message:

Error message in chrome:

Uncaught DOMException: Blocked a frame with origin " http://localhost:9001 " from accessing a cross-origin frame. at Object.FCKTools.FixDocumentParentWindow ( http://localhost:9001/cmscockpit/zkau/web/js/ext/FCKeditor/editor/js/fckeditorcode_gecko.js:7:42291 ) at Object.FCKTools.FixDocumentParentWindow ( http://localhost:9001/cmscockpit/zkau/web/js/ext/FCKeditor/editor/js/fckeditorcode_gecko.js:7:42372 ) at Object.FCKTools.FixDocumentParentWindow ( http://localhost:9001/cmscockpit/zkau/web/js/ext/FCKeditor/editor/js/fckeditorcode_gecko.js:7:42372 ) at Object.FCKTools.GetDocumentWindow ( http://localhost:9001/cmscockpit/zkau/web/js/ext/FCKeditor/editor/js/fckeditorcode_gecko.js:7:42168 ) at Object.FCKTools.GetElementWindow ( http://localhost:9001/cmscockpit/zkau/web/js/ext/FCKeditor/editor/js/fckeditorcode_gecko.js:7:42032 ) at FCKToolbarFontSizeCombo.FCKToolbarSpecialCombo.Create ( http://localhost:9001/cmscockpit/zkau/web/js/ext/FCKeditor/editor/js/fckeditorcode_gecko.js:7:204406 ) at FCKToolbar.Create ( http://localhost:9001/cmscockpit/zkau/web/js/ext/FCKeditor/editor/js/fckeditorcode_gecko.js:7 :220569 ) at FCKToolbarSet.Load ( http://localhost:9001/cmscockpit/zkau/web/js/ext/FCKeditor/editor/js/fckeditorcode_gecko.js:7:225568 ) at LoadToolbar ( http://localhost:9001/cmscockpit/zkau/web/js/ext/FCKeditor/editor/fckeditor.html?InstanceName=z_1t_ld5!ed:194:15 ) at Object.StartNext (:1:644)

Warning in firefox:

Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help http://xhr.spec.whatwg.org/

Not sure why the cross-origin error is coming up here, because the protocol, domain and the port are same in both the places.

Answer 1

Possible reasons:

1) The server is blocking the content to open in an iframe. To be implemented at server. 2) CORS. To be implemented at server.