Dynamics Community Forum Thread Details

Microsoft ARR (Application Request Routing) with Dynamics 365 9.1 On Premise

We have recently upgraded our CRM On premise to 9.1 (November 2023 9.1.23)

Our setup is that the Frontend server is behind the ARR Server with pass through.

There are Rest API calls that exceed 8000 characters which throws error on the ARR server (Bad Request - Request Too Long). This issue happens when your entity has a lot of custom fields added which also increase the length of the Rest API Call to the metadata.

The issue happens only when our request passes through the ARR and direct access to the Frontend server has no issues.

We have tried modifying the registry entries for as mentioned below but to no avail.

https://learn.microsoft.com/en-us/troubleshoot/developer/webapps/iis/www-administration-management/http-bad-request-response-kerberos

We also tried setting the max values on the requestfiltering inside the web.config inside ARR server but has no effect at all.

Q: Is there a setting on ARR that will allow request at around more than 8000 characters?

the long querystring rest api call was not an issue in 9.0 on premise.