SDC not accessible from SCH - java.net.UnknownHostException: cloud.streamsets.com

Problem:

SDC instance is reporting as inactive from SCH. In the SDC log file we can see entries like the one below:

com.streamsets.datacollector.event.client.api.EventException: Failed to read response for https://cloud.streamsets.com/messaging/rest/v1/events : javax.ws.rs.ProcessingException: java.net.UnknownHostException: cloud.streamsets.com

Solution:

In order to confirm if there is a problem with the DNS we can run the command nslookup cloud.streamsets.com. If the output looks like:

nslookup cloud.streamsets.comServer: X.X.X.XAddress: X.X.X.X#53** server can't find cloud.streamsets.com: NXDOMAIN

This issue usually happens for one of these two problems: A misconfiguration in your SDC instance with the DNS configs or a problem in the DNS server.