If you want to use certless TLS communication, there is no need to configure
DefaultNetstreamDriverCAFile, DefaultNetstreamDriverCertFile or
DefaultNetstreamDriverKeyFile.
See our sample configuratrions from the testbench:
https://github.com/rsyslog/rsyslog/blob/91885676001c9df1c2c91514d144cf71755d5d14/tests/sndrcv_tls_gtls_serveranon_gtls_clientanon.sh

I would recommend to switch over to the openssl (ossl) driver which gives us
way more detailed error messages.
My guess is that rsyslog and your NAS are not finding a shared cipher.

Best regards,
Andre Lorbach
--
Adiscon GmbH
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> -----Ursprüngliche Nachricht-----
> Von: rsyslog <rsyslog-boun...@lists.adiscon.com> Im Auftrag von Solarer
> via
> rsyslog
> Gesendet: Dienstag, 17. Mai 2022 17:46
> An: rsyslog@lists.adiscon.com
> Cc: Solarer <sola...@hotmail.de>
> Betreff: [rsyslog] Fwd: Disable Client Certificate Request
>
> Hi everybody,
> I am trying to get a Synology NAS to send its internal logs to a VM
> running
> rsyslog via TCP and TLS. The transmission works fine using UDP but once I
> enable encryption in the Synology, I am getting a (not very
> helpful) error message (see attached).
>
> Eventually I recorded the traffic with tcpdump on the VM running rsyslog
> and
> I see the a repeating pattern (second attachment).
>
> As you can see, the connection is reset after an internal error by the
> Synology box which happens right after the server HELLO. To me it looks
> like
> the rsyslog server is doing a certificate request for client auth but that
> is not
> supported by the Synology and so it crashes (I can only upload a CA to
> verify
> the server certificate but not a client cert).
>
> How can I disable this behavior? I am using StreamDriver.Authmode="anon"
> which should disable the client certificate request.
>
> Please find attached the rsyslog.conf in question.
> Thank you very much in advance
>
> OS: Fedora 35
> Packages:
> rsyslog.x86_64 8.2204.0-1.fc35 @updates-testing
> rsyslog-gnutls.x86_64 8.2204.0-1.fc35 @updates-testing
> rsyslog-openssl.x86_64 8.2204.0-1.fc35 @updates-testing
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