Sounds like the code path that is causing the error is not being run. Is that on Debian 12? Try with the following tls.cfg:
``` [server:default] method = TLSv1.2+ verify_certificate = yes require_certificate = yes private_key = /etc/ssl/private/dsiprouter-key.pem certificate = /etc/ssl/private/dsiprouter-cert.pem ca_list = /etc/ssl/certs/ca-certificates.crt ca_path = /etc/ssl/certs
[client:default] method = TLSv1.2+ verify_certificate = yes require_certificate = yes private_key = /etc/ssl/private/dsiprouter-key.pem certificate = /etc/ssl/private/dsiprouter-cert.pem ca_list = /etc/ssl/certs/ca-certificates.crt ca_path = /etc/ssl/certs ```