| Event Id | 21198 |
| Source | POP 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| Description | The client certificate was revoked due to an invalid or missing Certificate Revocation List (CRL).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: The CRL may have expired and ISA Server was unable to download a valid CRL. Resolution: Verify that the CRL download system policy configuration group is enabled and that there is connectivity to the CRL Distribution Points (CDPs). |
| Reference Links | Microsoft product: Internet Security and Acceleration Server Version: 4.0.3443.594 Event Source: POP Intrusion Detection Filter Event ID: 21198 |
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