This Issue can be observed while installing the JetDR software through the run command (Install-JetDRWithStaticIP).
Cause: This could happen when TCP port 443 is blocked for (AVS Run Command systems to JetStream MSA).
Resolution: Check if any firewall rule blocking port 443 for MSA IP.
Unblocking the port will resolve the issue.
Refer to the below KB for the list of ports that are required for JetStream AVS.