Microsoft Windows Server: Verify retrieval of Certificate Revocation List (CRL)

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Symptoms

Single sign-on authentication issues.

Cause

If a Microsoft Windows Domain Controller can not reach the Certificate Revocation List (CRL) of the Awingu appliance, single sign-on authentication will fail.

Resolution

On each of the Microsoft Windows servers taking care of Kerberos authentication (for instance on the domain controllers):

  1. Open a Windows PowerShell console.
  2. Execute this command: 
    certutil -URL "http://<awingu_internal_ip>/crl/<AWINGUDOMAINNAME>.crl"
    "http": leave this, the CRL is indeed fetched through HTTP (HTTPS not required).
    <awingu_internal_ip> : replace this with the IP of the Awingu appliance.
    <AWINGUDOMAINNAME> : should match the Awingu domain name - always in capitals (visible under System Settings > Global > Domains).
  3. In the window that appears, click [Retrieve].


If there is a problem obtaining the CRL, the reason can be found in the Windows Event Viewer under Custom > Administrative Events.

Mind that Microsoft Windows Servers should be able to access port 80 on the Awingu appliance. In customer cases, often a firewall is blocking this access.

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