When I try a SOAP connection I am getting an error: com.pega.pegarules.pub.services.RemoteApplicationException: SOAP service failed ...

Caused by: com.pega.apache.axis2.AxisFault: HTTP transport error: java.net.UnknownHostException: n  

We have a client-managed cloud, Amazon EKS. I am trying to connect to an internal server within the cloud.  I am trying to test our app in a 'sandbox' copy of our DEV environment. It has a single Pega pod which I have upgraded to 24.1.1.  I ran curl on the exact same URL from the Pega pod command line and did not get the error. I'm not sure where to look next.  The same app runs fine in our normal DEV environment, which is on Pega 7.3.1, so the issue is not the app. Any advice on finding the cause of this would be appreciated.