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I'm trying to add a block to an existing panel. The dialog opens but then I see this error,

The requested page "/panels/ajax/editor/select-content/panels_page_wizard:landing_page/bottom" could not be found.

and the ajax spinner never stops. The panel module is currently up to date, and google doesn't return any hits for the error.

I can create a brand new panel page, and the same problem occurs.

1 Answer 1

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Turned on logging and saw Rejected-By-UrlScan next to the 404 errors.

Since our site is hosted in IIS, I needed to go into URLScan config, and allow colons, which are used by the Panels ajax func

C:\Windows\system32\inetsrv\urlscan\UrlScan.ini

; :   ; Don't allow alternate stream access

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