Credential Less Discovery Functionality

Amit39 · ‎12-24-2020

Hi,

I can see during discovery automation jobs, most of the devices gets created/updated through credential less discovery process which only contains IPs and Names into respective CMDB tables. Also I can see both IPs and Names contains same value (IP address showcase on both fields). Some times existing CI information gets updated by credential less discovery, Below is the example

- Hostname replaced by IP address

- Name replaced by IP address

- No other info being populated into CMDB tables

Due to this we have duplicate and non required CIs being unnecessarily added to CMDB tables.

Is this due to credential less discovery option is enabled for all the MID servers (Total 5) I am using for discovery operations for Infra devices.

Please advise in case I can directly mark it to DISABLED from all the MID servers instances. Also do I need to make the updates to the property files also.

Thank you.

Regards,
Amit

Vivektietsood · ‎12-24-2020

Hi Amit, yes you can disable it with the methods you mentioned. This comes with a caveat though - how are you planning to keep your CMDB updated for the CIs for which you do not have crendetails. For example appliances. I would suggest to talk to your IT managers to check if you have any such cases. If yes then just consider finding out the IP ranges or IP address of those and consider running credential less discovery only for those.

You might also find this thread relevant.

https://community.servicenow.com/community?id=community_question&sys_id=74607428dbd5ac104aa5d9d96896...

Please mark helpful or accept solution so that it helps others with a similar question

View solution in original post

Rahul Priyadars · ‎12-24-2020

Hi Amit,

mid.discovery.credentialless.enable system property, which enables MID Servers on which Nmap is installed to be used for credential-less Discovery. This property is set to true by default .

mid.discovery.credentialless.enable =False This will stop horizontal Credential less discovery.

Uninstall NMAP from All mid servers - It will stop Credential less discovery.

For more details refer-

https://docs.servicenow.com/bundle/paris-it-operations-management/page/product/discovery/concept/nma...

*Please mark as Correct and or helpful if appropriate.

Regards

RP

Amit39 · ‎12-24-2020

Hi Rahul,

Thanks for the details. All I need to understand, in case I can disable this option for credential less discovery, does it going to impact any of my ongoing schedule discovery jobs.

Also I can see one option available inside SNOW MID server instances (under particular MID server name) as "Disable Credential Less Discovery". Can I use that option to disable credential less discovery.