SAP BTP: Failure reason: "An error of type UnknownHost occurred during check connection!"

Hi Community,

we want to connect SAP BTP to an S/4 Hana Cloud system.

We created the communication arrangement and checked via postman if the API is working. Via Postman we receive a positive feedback by usage of our communication user.

However, if we want to create the destination service on BTP subaccount level and do a connectivity check we receive the following message:

"An error of type UnknownHost occurred during check connection!"

While searching for answers and KBA's I found only one KBA that is not helping as it describes the solution for OnPrem systems.

We can also retrieve the data if we define a destination service directly in the code.

Could you please support?

Many thanks in advance and best regards,

Dominic