Custom error config changes might cause some Umbraco 400 response issues. As a results while saving and publishing umbraco content, you might see "PostSave 400 Bad Request" messages. In my case I also couldn't see some umbraco mandatory field validation messages. In order to fix it you can add the following line to your web.config and it should start working. <location path="umbraco"> <system.webServer> <httpErrors existingResponse="PassThrough" /> </system.webServer> </location> Request URL: https://DOMAINNAME/umbraco/backoffice/UmbracoApi/Content/PostSave Request Method: POST Status Code: 400 Bad Request
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