Unable to add to MID server NMAP capabilities

[WojciechSzefler]

Hi, all I would like to enable credentialless discovery, according and following documentation I have installed nmap on midserver (manually, due to security restriction auto install do not work). Installation of nmap was successful.

Mid server is up, validated and working fine. But... when i try to add Nmap capabilities to midserver in configuration of midserver, option is not saved , simply is not possible to add. Tried already multiple time, multiple ways... any suggestion. (Yes global sys property to enable such type of discovery is set to yes, and Yes i dig community forum for similar cases)
Any suggestion why nmap capabilities are not saved in configuration ?

[-O-]

Or when saying "admin" do you mean "maint"?

Cause the docs clearly state:

Important: Only a maint user can add the Nmap capability to a MID Server. Contact Customer Service and Support to request temporary maint access to your instance.

[WojciechSzefler]

according to doc:
The Nmap MID Server capabilities is added to the MID Server when Nmap is installed and removed automatically when Nmap in uninstalled. 
so manual activity which you described and what i'm trying to do should even not take place...

[-O-]

Yes, that is what I am trying to say.
Do you have access to instances of lower version?
If so, I'd try to configure Credential-less there.

[TimW1]

FYI - ServiceNow discovery will give this error sometimes when it can't connect to a windows host WMI.  Make sure you attempt discovery of something else on the same subnet before you attempt to to install NMAP.  It's a bogus error that can be received from the discovery logs.  You can test WMI from the mid server to the destination server by opening a command prompt on your mid server and run  "wmic /node:DESTINATIONIPADDRESSHERE os get freePhysicalMemory"