On one of my web nodes (web3), any Let's Encrypt SSL request submitted via the ISPConfig UI gets stuck in the job queue and is never processed — the UI shows “Requesting Let's Encrypt SSL Certificate…” indefinitely but same is happening no matter what I edit, it just not moves on. The issue resolves only if I manually kill the existing server.php process (which is stuck in a read() syscall according to strace) and then run /usr/local/ispconfig/server/server.sh manually. Only then is the queued job processed and the SSL certificate issued successfully. This behavior only affects this node; other web servers process SSL requests normally. No errors are logged in server.log or cron.log. The site is correctly configured and reachable via HTTP for the ACME challenge. Any ideas?
Please use debug mode https://www.faqforge.com/linux/debugging-ispconfig-3-server-actions-in-case-of-a-failure/ to request the LE certificate and post the full debug output for this operation that you get on the shell.
