Getting urn:ietf:params:acme:error:unauthorized error while creating new certificate

Before reload

● nginx.service - A high performance web server and a reverse proxy server
     Loaded: loaded (/lib/systemd/system/nginx.service; enabled; preset: enabled)
     Active: active (running) since Wed 2025-05-28 17:00:05 UTC; 12h ago
       Docs: man:nginx(8)
    Process: 3743792 ExecStartPre=/usr/sbin/nginx -t -q -g daemon on; master_process on; (code=exited, status=0/SUCCESS)
    Process: 3743793 ExecStart=/usr/sbin/nginx -g daemon on; master_process on; (code=exited, status=0/SUCCESS)
   Main PID: 3743794 (nginx)
      Tasks: 5 (limit: 9484)
     Memory: 838.1M
        CPU: 20min 42.835s
     CGroup: /system.slice/nginx.service
             ├─3743794 "nginx: master process /usr/sbin/nginx -g daemon on; master_process on;"
             ├─3743795 "nginx: worker process"
             ├─3743796 "nginx: worker process"
             ├─3743797 "nginx: worker process"
             └─3743798 "nginx: worker process"

May 28 17:00:04 localhost systemd[1]: Starting nginx.service - A high performance web server and a reverse proxy server...
May 28 17:00:05 localhost systemd[1]: Started nginx.service - A high performance web server and a reverse proxy server.

After reload

● nginx.service - A high performance web server and a reverse proxy server
     Loaded: loaded (/lib/systemd/system/nginx.service; enabled; preset: enabled)
     Active: active (running) since Wed 2025-05-28 17:00:05 UTC; 12h ago
       Docs: man:nginx(8)
    Process: 3743792 ExecStartPre=/usr/sbin/nginx -t -q -g daemon on; master_process on; (code=exited, status=0/SUCCESS)
    Process: 3743793 ExecStart=/usr/sbin/nginx -g daemon on; master_process on; (code=exited, status=0/SUCCESS)
    Process: 628657 ExecReload=/usr/sbin/nginx -g daemon on; master_process on; -s reload (code=exited, status=0/SUCCESS)
   Main PID: 3743794 (nginx)
      Tasks: 5 (limit: 9484)
     Memory: 839.8M
        CPU: 20min 44.231s
     CGroup: /system.slice/nginx.service
             ├─3743794 "nginx: master process /usr/sbin/nginx -g daemon on; master_process on;"
             ├─3743795 "nginx: worker process"
             ├─3743796 "nginx: worker process"
             ├─3743797 "nginx: worker process"
             └─3743798 "nginx: worker process"

May 28 17:00:04 localhost systemd[1]: Starting nginx.service - A high performance web server and a reverse proxy server...
May 28 17:00:05 localhost systemd[1]: Started nginx.service - A high performance web server and a reverse proxy server.
May 29 05:23:02 localhost systemd[1]: Reloading nginx.service - A high performance web server and a reverse proxy server...
May 29 05:23:03 localhost nginx[628657]: 2025/05/29 05:23:02 [notice] 628657#628657: signal process started
May 29 05:23:03 localhost systemd[1]: Reloaded nginx.service - A high performance web server and a reverse proxy server.

After restart

● nginx.service - A high performance web server and a reverse proxy server
     Loaded: loaded (/lib/systemd/system/nginx.service; enabled; preset: enabled)
     Active: active (running) since Thu 2025-05-29 05:23:27 UTC; 2s ago
       Docs: man:nginx(8)
    Process: 628992 ExecStartPre=/usr/sbin/nginx -t -q -g daemon on; master_process on; (code=exited, status=0/SUCCESS)
    Process: 628994 ExecStart=/usr/sbin/nginx -g daemon on; master_process on; (code=exited, status=0/SUCCESS)
   Main PID: 628995 (nginx)
      Tasks: 5 (limit: 9484)
     Memory: 50.2M
        CPU: 1.073s
     CGroup: /system.slice/nginx.service
             ├─628995 "nginx: master process /usr/sbin/nginx -g daemon on; master_process on;"
             ├─628996 "nginx: worker process"
             ├─628997 "nginx: worker process"
             ├─628998 "nginx: worker process"
             └─628999 "nginx: worker process"

May 29 05:23:26 localhost systemd[1]: Starting nginx.service - A high performance web server and a reverse proxy server...
May 29 05:23:27 localhost systemd[1]: Started nginx.service - A high performance web server and a reverse proxy server.

Basically reload didn't generate new workers, but restart did.

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