Why rsyslog with gnutls enforcing TLS v1.2 leads to an error in RHEL6?

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Issue

We set up rsyslog with gnutls. TLS v1.1 is used by default and works correctly, however enforcing TLS v1.2 leads to an error.

Environment

Red Hat Enterprise Linux (RHEL) 6
gnutls-2.8.5
rsyslogd 5.8.10

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