Meraki VPN – The remove connection was denied because the username and password combination – AD Auth

Trying to authenticate a user with their AD credentials and the error displayed

The remote connection was denied because of the username and password combination

In the Event Log on the Meraki

Also saw these errors

msg: invalid DH group 19.
msg: invalid DH group 20.

msg: failed to begin ipsec sa negotiation.

You need a TLS Certificate on the Domain Controller and Radius server for Communication , run the below powershell

New-SelfSignedCertificate -DnsName domaincontroller.domain.local -CertStoreLocation cert:\LocalMachine\My

This will create a cert for you in Personal / Certificates for the Local Computer

You will need to use the MMC to copy this to the Trusted Root Certification Authorities

I also has issues with Radius with the error : msg: failed to begin ipsec sa negotiation.

In the end I had to Clear out the Conditions in the network polices ( Specifically the Calling Station ID ) and re-add

(No Ratings Yet)