SCCM LINK FAILED ISSUE - NETWORK ISSUE?

Hi,

Encountered this SSCM link failed issue and would like to verify what could be the root cause of this issue? We have 1 parent and 2 child servers and this issue is only encountered between parent1 and child2 while connection from parent to child1 is stable. Each servers (parent,child) is located in different site and using different transport medium (mpls, tunnel).

Diagram: https://ibb.co/4ZQY9pW

Now the issue here is we don't manage the Server and I not that familiar in troubleshooting this type of application/setup.

During the issue we can able to validated that ping is working fine and other protocols like RDP from parent1 to child2 while we still see this link failed from SCCM status. Checked also that there no network issue and this is the only issue reported between the site. No link error, congestion, routing issue between parent1 and child2. Also no filtering is being applied that may affect the communication as this issue happens in sometime.

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With that, I would like to ask what could be the issue here? Anyone here can shed some light in how this sccm syncronization works?

1, What protocol is being use to check the link status from SCCM parent and child2?

1. Is it purely SMB being use between SCCM parent - child2?

2. What other this need to be check on network and the physcal server?

Please share on input and idea how to troubleshoot this.

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Thank you