@atripp thanks for your reply! Any suggestions how to debug this? I'm use the ProGet docker image.

I'm trying to add a package from the Chocolatey repository to ProGet via Feed --> Add Package --> Pull from another repository.

I fill the form as follows:

NuGet feed: https://chocolatey.org/api/v2/
Package ID: adobereader
Package version: <blank>

After clicking 'Install Package' the following error message is shown:

"The package could not be installed.
The operation has timed out."

I'm running the Linux version on CentOS 8.

Any ideas on how to fix this?