Unable to download attachments via Api from instance behind Identity Access Management solution

[vijayendra]

Hey all,

I have data centre behind an `Identity Access Management provider`. I'm trying to download an attachment using a confluence link.

https://{domain-name}/download/attachments/{Page-id}/{attachment-name.png}

The curl request: 
curl --location --request GET
'https://{domain-name}/download/attachments/{Page-id}/{attachment-name.png}' \
--header 'Authorization: Bearer TOKEN' \

When I try to open the downloaded attachment, it redirects me to the `Identity Access Management` page showing error `There was an unexpected internal error`.

I have allowed the IPs in `Identity Access Management provider` and I am able to successfully retrieve the page content with the API but downloading the attachments are failing.

[Brant Schroeder]

@vijayendra welcome to the Atlassian community 

What happens if you login first using the identity access management is a browser then go to the link, are you able to download it?  Also what are you seeing in the logs?

[vijayendra]

I identified the issue. We had to whitelist the IPs in Confluence from which the request was originating and also the attachment endpoint which we are using to download.