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A certificate validation fails when CRL is not available even though it should fall back to none.
The issue was found in IOS-XE 16.6.4. Revocation check configured to use CRL and fall back to "none" if needed: "revocation-check crl none". CRL cannot be verified (CDP URL was not reachable in the investigated case).
Configure "revocation-check none". Make sure CRL can be verified successfully.
The issue may affect other software releases.
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