Discovery using WMI and WinRM Authentication

MatinDe
Tera Contributor

‎03-29-2024 03:45 AM

Hi Team,

 

We're having issue in discovering Windows servers. Some server authenticates using WMI but some using WinRM as the value of the config parameter of the MID server but we can only configure one. Is there a way to use both? If we remove the parameter, we get "Get-CimClass : Access is denied. " error. Anyone who experience the same? Thanks.

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AJ-TechTrek
Giga Sage
Giga Sage

‎03-29-2024 05:55 AM

HI @MatinDe ,

 

Its depends on which class discovery you are doing, if you are running discovery on Windows , It will use the WMI and WINRM but for Storage CIM Server discovery it will use the WINRM. 

 

WMI vs WinRM

ServiceNow discovery leverages multiple protocols to communicate with the target devices. Either WMI or WinRM can be utilized for windows discovery. The protocol used for windows discovery is controlled at the MID server level via MID server parameter "mid.windows.management_protocol". The default value for this property is "WMI".

Network Requirements

WMI and WinRM have different network/firewall requirements.

WMI

WMI is based on DCOM/RPC. This means a connection is first initiated on port 135 to determine what dynamic port to use. The connection then proceeds to use the dynamic port negotiated.

The following Microsoft documentation provides more information on this topic:

Enhanced windows discovery also uses the target server admin$ and as such also requires file sharing port traffic to be allowed (port 445). For more information on enhanced windows discovery please see:

WinRM

WinRM uses port 5985 (HTTP) or 5986 (HTTPS), this depends on the configuration on the target host. The following Microsoft documentation provides further information on setting up WinRM:

https://support.servicenow.com/kb?id=kb_article_view&sysparm_article=KB1116898

 

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Thanks

AJ

Linkedin Profile:- https://www.linkedin.com/in/ajay-kumar-66a91385/

ServiceNow Community Rising Star 2024

 

 

s4scott
Tera Guru

‎03-29-2024 06:51 AM - edited ‎03-29-2024 06:51 AM

MatinDe I recommend you open a ticket with support to find out if there is an error in the pattern or if there is a modification that will enable the desired behavior.
The AI generated response above isn't helpful.

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