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409 conflict creating block


Hi! I'm having an issue creating a certain block of mine. It occurs both in production and in development and also running version 10 and the latest version.

When creating the block I get an error in my browser console stating a 409 conflict error. It happens approx 80 % of the times trying to create the block.

  1. Request URL: http://mydomain/EPiServer/cms/Stores/contentdata/
  2. Request Method: POST
  3. Status Code: 409 Conflict

The request payload:

  "name": "New Blockaaaa",
  "parentLink": "5_76891",
  "contentTypeId": 46,
  "properties": {
    "icategorizable_category": [],
    "image": "/link/8690b853be154572967feb02028fef05.aspx",
    "name": "xx",
    "title": "xxxxx",
    "mainBody": "


", "phone": "xxx", "email": "xxxxx" }, "createAsLocalAsset": true, "autoPublish": true }

I can't see anything strange with the block other than that it inherits from another blocktype. But thats alright isn't it?

Dec 18, 2017 9:11

+1. We are experiencing the same issue.

Jan 02, 2018 10:59

Did you solve it? I am experiencing the same issue.

Apr 19, 2018 12:02

Can you post the code?

Apr 19, 2018 23:18

Please review this knowledge base and let me know if it helps

Apr 20, 2018 5:49

I am experiencing the same issue. (Version 10)

I have reviewed the solution suggested in the link above and can confirm this occurs even when with existingResponse attribute is set to

   existingResponse="PassThrough" />

or it's not added.

Here are some more details:

  • issue seems to occur for certain blocks only
    • blocks have required properties and non-required properties
    • most properties are culturespecific
  • issue occurs only when user tries to create these blocks from ContentArea
    • issue never occurs when blocks are created on the Assets panel
    • Response is 
      • message: "Unable to load /secui/cms/Stores/contentdata/ status: 409"
      • url:"/secui/cms/Stores/contentdata/"
      • responseText: "The page was not displayed because there was a conflict."
      • status:409
      • statusText:"Conflict"
May 21, 2018 18:29

We had a selection factory which timed out causing a 409. We checked the logging and got an Unexpected error when requesting  model accessor which pointed us to the problem in the stack trace.

I would check the logs for MetadataStore for any hints of what goes wrong.

In our case:

Unexpected error when requesting model accessor for EPiServer.Core.ContentData with parameter {"parentLink":"117","contentTypeId":24} System.Net.WebException: The operation has timed out at Sys (..)
Edited, Jun 25, 2018 13:28

If you are using a version earlier than 11.8 this can be caused by a custom validator which fires a validation message, but is not displayed due to bug Bug - CMS-11522 


Oct 30, 2018 5:25

I have recently started to see this error message and am on EPiServer.CMS.UI 11.16.0.

Aug 07, 2019 13:23

We are seeing it on EPiServer.CMS.UI 11.18.0. It only happens when creating a block with custom validator from the ContentArea. When creating from assets pane, it works.

Same issue as described here:

Edited, Nov 06, 2019 13:17
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