Remote Desktop Gateway + client error: The Kerberos client received a KRB_AP_ERR_MODIFIED error from the server servername$
I’ve setup a new RDG server but couldn’t connect to it.
The client PC registered in the eventlog: The Kerberos client received a KRB_AP_ERR_MODIFIED error from the server servername$. The target name used was HTTP/externalservername.com
After some searching I’ve solved this by modifying SPN records for the server on a DC.
So I ran: setspn -Q host/servername and get the list of SPNs for this server.
Then I added the new record: setspn -A HTTP/externalservername.com servername$
And voila – It worked.
It’s strange because I didn’t have such issues for other RDG hosts and they don’t have additional SPNs for an external address.
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