While seeking for a reason, a page is not opening in apache2.4, I'm seeing the following in my error.log:
[Wed Jun 28 09:36:55.046479 2023] [ssl:info] [pid 4548] AH01914: Configuring server mydomain.de:443 for SSL protocol
[Wed Jun 28 09:36:55.046501 2023] [ssl:debug] [pid 4548] ssl_engine_init.c(1705): AH: Init: (mydomain.de:443) mod_md support is unavailable.
[Wed Jun 28 09:36:55.046715 2023] [ssl:debug] [pid 4548] ssl_engine_init.c(492): AH01893: Configuring TLS extension handling
[Wed Jun 28 09:36:55.047685 2023] [ssl:debug] [pid 4548] ssl_util_ssl.c(470): AH02412: [mydomain.de:443] Cert matches for name 'mydomain.de' [subject: CN=welt.de / issuer: CN=R3,O=Let's Encrypt,C=US / serial: 0499C6F899E6062B92B48C1E98003BAB7746 / notbefore: Jun 24 07:26:21 2023 GMT / notafter: Sep 22 07:26:20 2023 GMT]
[Wed Jun 28 09:36:55.047702 2023] [ssl:info] [pid 4548] AH02568: Certificate and private key mydomain.de:443:0 configured from /etc/letsencrypt/live/welt.de/fullchain.pem and /etc/letsencrypt/live/mydomain.de/privkey.pem
[Wed Jun 28 09:36:55.144434 2023] [ssl:info] [pid 4551] AH01914: Configuring server mydomain.de:443 for SSL protocol
[Wed Jun 28 09:36:55.144444 2023] [ssl:debug] [pid 4551] ssl_engine_init.c(1705): AH: Init: (mydomain.de:443) mod_md support is unavailable.
[Wed Jun 28 09:36:55.144584 2023] [ssl:debug] [pid 4551] ssl_engine_init.c(492): AH01893: Configuring TLS extension handling
[Wed Jun 28 09:36:55.145002 2023] [ssl:debug] [pid 4551] ssl_util_ssl.c(470): AH02412: [mydomain.de:443] Cert matches for name 'mydomain.de' [subject: CN=welt.de / issuer: CN=R3,O=Let's Encrypt,C=US / serial: 0499C6F899E6062B92B48C1E98003BAB7746 / notbefore: Jun 24 07:26:21 2023 GMT / notafter: Sep 22 07:26:20 2023 GMT]
[Wed Jun 28 09:36:55.145011 2023] [ssl:info] [pid 4551] AH02568: Certificate and private key mydomain.de:443:0 configured from /etc/letsencrypt/live/welt.de/fullchain.pem and /etc/letsencrypt/live/mydomain.de/privkey.pem
Do I have to be concerned about the missing mod_md support?