| Event Id | 21198 |
| Source | DNS Intrusion Detection Filter |
| Description | The client certificate was revoked due to an invalid or missing Certificate Revocation List (CRL). The CRL may have expired and ISA Server was unable to download a valid CRL. Verify that the CRL download system policy configuration group is enabled and that there is connectivity to the CRL Distribution Points (CDPs). |
| Event Information |
According to Microsoft : CAUSE : The CRL may have expired and ISA Server was unable to download a valid CRL SOLUTION : Verify that the CRL download system policy configuration group is enabled and that there is connectivity to the CRL Distribution Points (CDPs). |
| Reference Links | Event ID: 21198 Of Source ID:DNS Intrusion Detection Filter |
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