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

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.

A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.

Here are the common uses of Markdown.

Code blocks

~~~
Code surrounded in tildes is easier to read
~~~

Links/URLs

[Red Hat Customer Portal](https://access.redhat.com)