Hi everybody;
for unknown reason nginx stopped
when I try
` systemctl status nginx.service`

i got this issue:

● nginx.service - A high performance web server and a reverse proxy server
Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Fri 2020-04-17 13:28:38 EET; 7s ago
Docs: man:nginx(8)
Process: 28887 ExecStartPre=/usr/sbin/nginx -t -q -g daemon on; master_process on;
(code=exited, status=1/FAILURE)

: Starting A high performance web server and a reverse proxy server...
: nginx: [emerg] host not found in upstream "frappe-bench-socketio-server" in /etc/nginx/conf.d/ssl.conf:35
: nginx: configuration file /etc/nginx/nginx.conf test failed
: nginx.service: Control process exited, code=exited status=1
: nginx.service: Failed with result 'exit-code'.
: Failed to start A high performance web server and a reverse proxy server.


also ` sudo nginx`

result this issue:

nginx: [emerg] host not found in upstream "frappe-bench-socketio-server" in /etc
/nginx/conf.d/ssl.conf:35
`
and this is line 35 in ssl.conf

proxy_pass http://frappe-bench-socketio-server;