- Sql error 18456 token based server access validation failed code#
- Sql error 18456 token based server access validation failed password#
The problem is, those "standard" images come with a "standard" password for the local Administrator account. In just about every large organization, servers and workstations are built from a standard image to save time. I wanted to talk about another similar security threat that is often outlined in these whitepapers, and what we did at my customer to solve the problem. In the news recently, you’ve probably read a lot about Pass the Hash. I changed the security setting for RDP back to secure and was able to log on through Remote Desktop. I then restarted the Remote Desktop Services service and this time I didn't get the error about the certificate. (Security/Advanced/Change Permissions/Replace all child object permissions) and applied this. I then opened the MachineKeys and re-applied the full-control permission to the local server administrators group.
I moved them all to a subfolder so there were none left in the MachineKeys folder. What did finally work, I noticed that we had a bunch of crypto keys that looked like this:Ĭ:\ProgramData\Microsoft\Crypto\RSA\MachineKeys\f686aace6942fb7f7ceb231212eef4a4_XXXXXXXX I also deleted the Host Configuration's RDP-Tcp connection object all together and restarted the Remote Desktop Services service. “HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM” > Certificate “HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM” > CertificateOld “HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations” > SelfSignedCertificate In my case I had already tried a lot of the advice like deleting the self-signed certificate and rebooting (MMC/Certificates/Local Computer/Remote Desktop) And deleting these keys and restarting: The conditions you'll probably also notice is that you can't remote desktop into the server until you remove the "Allow connection only from computers running Remote Desktop with Network Level Authentication" checkbox in the Remote Desktop Session Host Configuration's RDP-Tcp properties General Tab or from the System settings under the Remote tab by changing the radio button back to "Allow connections from computers running any version of Remote Desktop (less secure)".
Sql error 18456 token based server access validation failed code#
The relevant status code was Key not valid for use in specified state" from source TerminalServices-RemoteConnectionManager in the System event log, you may have an issue with a lot of strange advice. If you receive Event ID 1057 – "The Terminal Server has failed to create a new self signed certificate to be used for Terminal Server authentication on SSL connections. This may turn up that builtin\administrators or the service account (or some other important security principle) has a specific "deny" on "connect sql" or… revoke, or even a simple lack of grant. In our case what was happening was the configuration server was no longer accessible by the various SQL servers and this was appearing on that server every minute. In 2012 a lot of rules changed in regards to grouping but in 08R2 the loss of this would potentially cause various outages. Though this isn't the only potential root cause, a deny or revoke or lack of grant can cause this. Especially considering that the error suggests an issue with tokens and authentication, rather than permissions. Check for previous errors" somebody may have messed with your "CONNECT SQL" permissions.Įverybody who reads this blog knows that I'm not a SQL guy, but a lot of advice on the internet suggests that this is UAC related so some of you Platform and AD folks might get asked about the error. Reason: Token-based server access validation failed with an infrastructure error. If you get event ID 18456 with Source MSSQLSERVER in your application and SQL logs with the verbiage of "Login failed for user 'domain\'.
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