Credential-less Discovery: "accuracy" field coming from nmap

[MiguelSL]

Hello everyone,

We are currently testing Credential-less Discovery and while debugging the pattern to understand how it works, I noticed the following:

The first thing that the pattern is doing is to scan ports in the host and the response is stored in a variable/table called '$HostDiscovery'. One of the variables inside '$HostDiscovery' is called "accuracy", which is used in subsequent steps as a condition and even in some scripts; if this field ('accuracy') comes empty for all the ports of a host, then the pattern execution is terminated, preventing the creation of the record in CMDB.

The issue is that this is happening with a lot of IPs, stopping the creation of a lot of records. What I'd like to understand is the nature of the "accuracy" field; what does it represent? what would be the consequences of bypassing it during the pattern execution?

I'm assuming it represents something similar to a score, but I don't know why its' coming empty in so many cases or what's its purpose.

This KB explains what I'm seeing, but I don't have the issue described in the KB (which is that the conditions are failing): https://support.servicenow.com/kb?id=kb_article_view&sysparm_article=KB1638846

Thanks a lot in advance! Any guidance will be greatly appreciated since I haven't been able to find much information about this. I'm attaching a couple of images for your reference.

[Abbas_5]

Hello @MiguelSL,

Please refer to the link below:
https://www.servicenow.com/docs/bundle/washingtondc-it-operations-management/page/product/discovery/...

If this is helpful, please hit the thumbs up button and accept the correct solution by referring to this solution in future it will be helpful to them.

Thanks & Regards,

Abbas Shaik

[MiguelSL]

I already checked that doc but I couldn't find any information related to that specific field ("accuracy"). There are no details on how it is fetched/calculated, which might help to understand why it is coming empty.

[Pratiksha]

Accuracy is Confidence in host fingerprinting (based on port responses). 

[MiguelSL]

Ok, makes sense but in that case I would imagine that the field should have a value, allowing the pattern to "make a decision" based on it. In my case, it's always coming empty and I'm testing it against quite a lot IPs. This results in the pattern being terminated for all of them and no records being inserted.