Hi Matt,
"How does OMA-DM client (omadmclient.exe) communicate to MS WNS? Does this process use the Svchost.exe process to connect outbound ?"
Reply: The OMA-DM client communicates with the server over HTTPS. It uses DM Sync (OMA DM v1.2) as the message payload1. https://learn.microsoft.com/en-us/windows/client-management/oma-dm-protocol-support
"How does svchost.exe renew its TCP connections to WNS service. What is the connection mechanism entails?"
Reply: The OMA-DM client itself does not directly use the Svchost.exe process for outbound communication to WNS. Svchost.exe is a generic host process that runs multiple Windows services. It doesn’t specifically handle OMA-DM communication. Instead, the OMA-DM client establishes its own connections to WNS using HTTPS.