Looking for any guidance or experience - We have an Aruba Central customer (primarily 515s, running 8.6.0.5 however this was showing on previous builds as well) which shows numerous DNS Failures.
Unfortunately we're not provided any further details for these failures other than;
'Domain Name does not Exist'
This customer is primarily Windows devices (mixture of BYOD / Domain Bound / Azure Bound). Our investigations point to devices doing a check for 'wpad' DNS record as out of the box Windows devices will be sent to 'Automatically detect settings'
From Server 2008 onwards wpad can be disabled - We do not require users to resolve the wpad for internet / proxy. As a result the onsite local DNS servers block and do not respond to wpad queries.
We believe this is what Aruba Central / IAPs are seeing and then reporting on which is a false positive.
Moving forward;
- Can we get further information on what Aruba thinks is not resolving? (to confirm it is wpad)
- Can we exclude this false - positive from the Analytics?
https://docs.microsoft.com/en-us/powershell/module/dnsserver/set-dnsserverglobalqueryblocklist?view=win10-ps