Hello!
acl revoked_cert ssl_c_sha1 -m bin
FC481501DB98290C5E9B22530D2CA73EB36E76C5
matches the bad certificate.
Thank you _a lot_, Lukas, for the example and for the link to the porper
documentation section!
To summarize, to block the client I declare
acl revoked_cert ssl_c_sha1 -m bin
FC481501DB98290C5E9B22530D2CA73EB36E76C5
tcp-request content reject if revoked_cert
and not
acl revoked_cert ssl_c_sha1 -m bin
FC481501DB98290C5E9B22530D2CA73EB36E76C5
tcp-request session reject if revoked_cert
as I wrote before.
Thank you again
.marcoc