I don’t believe that will be causing the problem you are seeing. The x509 ccertificate/keys/etc are created much quicker since Core Update 172 because the Diffie Hellman parameter is no longer created but is a fixed parameter set at 4096 bits. See this blog announcement and the links within it.
https://blog.ipfire.org/post/ipfire-2-27-core-update-172-released
You have to add in lines for the legacy mode.
Follow the details mentioned in the link earlier in this thread. I repeat it here.
https://community.ipfire.org/t/ovpn-cert-creation-algo/7911/18
The post mentions un-commenting the legacy lines but in my Arch Linux system I had to create the lines.
Your screen shot looks fine. I can not find any problem there.
Before doing a reboot. As pressing the button on the WUI cgi page is not working there might be some message in the http log.
Run
tail -f /var/log/httpd/error_log
in a console or ssh window into IPFire.
Then press the Start OpenVPN Server button and see what new lines occur in the error_log file.
Please post the new lines created in that log, editing any personal or privacy items.
This might show up where the start process is failing.
IPFire is not on Discord.
It used to be on IRC but the Freenode IRC network was hijacked and that also affected IPFire. They now jave a Jabber server.
https://blog.ipfire.org/post/Relaunching #ipfire