nginx-1.17.3 and TLS v1.3

[TC_Hessen]

Hi,

I am new to this forum, but not new to nginx. I am running multiple debian
servers (stretch) with nginx 1.14.1 and TLS 1.3 support, i.e.

nginx version: nginx/1.14.1
built with OpenSSL 1.1.0f  25 May 2017 (running with OpenSSL 1.1.1c  28 May
2019)
TLS SNI support enabled

To prevent the servers agains the new bugs, I tried to upgrade directly to
1.17.3 provided by nginx.org. That works without any problems, but TLS 1.3
is not running anymore:

nginx version: nginx/1.17.3
built by gcc 6.3.0 20170516 (Debian 6.3.0-18+deb9u1)
built with OpenSSL 1.1.0j  20 Nov 2018 (running with OpenSSL 1.1.1c  28 May
2019)
TLS SNI support enabled

Where is the error?

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,285294,285294#msg-285294