why only one server is able to access to WMI server at one time

Question

Hello team,

server IP: xx.xx.2.127

product ID: 'hidden-80653-31914-AA611'

windows server 2019 standard

The WMI seems not working well on this server. The WMI service is running and we release port 445 and port 49152 to 65535.

There are 4 servers, their IP address are showing like below:

xx.xx.4.87, xx.xx.2.97, xx.xx.2.96, xx.xx.2.127

When we use 'wbemtest' tool to connect 2.127, we found following issue.

Test at 16:30 pm,

4.87 to 2.127 succeed

4.87 to 2.96 succeed

2.97 to 2.127 failed

2.97 to 2.96 succeed

Test at 17:20 pm,

4.87 to 2.127 failed

2.96 to 2.127 failed

2.97 to 2.127 succeed

2.127 to 4.87, succeed

2.127 to 2.96, succeed

2.127 to 2.97, succeed

We changed nothing in system during this hour, but the failed one switched to succeed, and the succeed one switched to failure. I attached the failure message in mail, it says “The RPC server is unavailable”. This happened randomly and it affects our monitoring system.

Could you please share with us what could be the possible reason and how to fix it. Is there any method to limit WMI's max connection number.

Thank you!