Request URL: http://mydomain/EPiServer/cms/Stores/contentdata/
Request Method: POST
Status Code: 409 Conflict
Please check and see if you use custom errors handling in the following fragment of web.config file:
<httpErrors errorMode="Custom" existingResponse="Replace">
<error statusCode="404" path="/Error404.aspx" responseMode="ExecuteURL"/>
<error statusCode="500" path="/Error500.aspx" responseMode="ExecuteURL"/>
If so the problem is with existingResponse="Replace", try removing this from the web.config and the validation will start to work as expected.
This is happening because of configuring httperrors for the whole application and EPiServer uses several 4xx HTTP Errors internally and requires the response NOT to be replaced.
The 2 possible solutions:
- Completely stop using existingResponse="Replace" and pick another alternative
- Do not use existingResponse="Replace" in /EPiServer/CMS location