First stupid question - are you sure you're using GnuTLS? As I see - Debian's rsyslog package suggests either rsyslog-gnutls or rsyslog-openssl so you might have installed "the other one".

Anyway, as far as I remember the TLS-specific settings are mostly passed through to the TLS library and tend to - if they do - fail relatively silently. I mean - the misconfiguration of the tls.tlscfgcmd, for example, gives an error in the log that applying the settings failed and then the socket gets created with some default options. So check your logs for any messages related to TLS configuration.

MK

On 20.04.2022 19:12, kathy lyons via rsyslog wrote:
I'm trying to set up TLS 1.3 for rsyslog on Debian 10 system.  The default
rsyslog on Deb 10 is 8.2102.  I've tried to use TLS by inserting this in a
file in rsyslog.d/tls.conf on my client:

module(load="imtcp"
         StreamDriver.mode="1"
         StreamDriver.authmode="anon"
         gnutlsprioritystring="SECURE128:-VERS-TLS-ALL:+VERS-TLS1.3"
)

When I tcpdump rsyslog, it still shows TLS1.2  What else do I have to
change?
TIA.
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