At a customer site I ran into an Arcsight SIEM integration that broke after upgrading from R77.30 to R80. Turned out the OPSEC library used to compile that version of the Arcsight application did not support the SHA-256 algorithm, which is used by default to sign the CRL in R80 and later. See the following for a workaround involving SHA-1: sk109618: OPSEC SIC connection fails.
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