How the WMI connections are made (firewall rules)? (4273563)

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Title

How the WMI connections are made (firewall rules)?
Description

Which ports need to be opened to enable WMI communication between 2 servers.
Cause

How the WMI query from Host A to Host B is processed:
Host A will initiate a TCP connection to the 135 port of Host B using an outbound port in the 49152-65535 range on Host A.
Host B then will try to connect to port 135 of Host A, this will require opening an outbound port in the range 49152-65535 on Host B
Please, remember that TCP always requires a set of 4 ports to establish a connection.
Resolution

WMI ports can be limited following this guide:
https://support.quest.com/technical-documents/spotlight-on-sql-server-enterprise/11.6/deployment-guide/deployment-over-the-windows-network/how-to-limit-the-number-of-ports-used-by-wmi

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