24 no live upstreams while connecting to upstream, client: 10.0.3.1 server: xxx

#I always get this error:

I set in jenkins two variables

“VIRTUAL_HOST=jenkins.xxx.com” “VIRTUAL_PORT=8020”

but in nginx-proxy console I get:

nginx.1 | jenkins.xxx.info 10.0.3.1 - - [26/Jan/2017:14:22:10 +0000] “GET / HTTP/1.1” 502 166 “-”

“Mozilla/5.0 (Windows NT 10.0; WOW64; rv:51.0) Gecko/20100101 Firefox/51.0”
nginx.1 | 2017/01/26 14:22:10 [error] 39#39: *24 no live upstreams while connecting to upstream, client: 10.0.3.1, server: jen kins.xxx.info, request: “GET / HTTP/1.1”, upstream: “http://7388ea39588cd39638dc61b60d26fe329b4cdc1d/”, host: “jenkins.xxx. info”

Why is client 10.0.3.1?

My config:

docker exec 91d3279be4b6 cat /etc/nginx/conf.d/default.conf

cat: /etc/nginx/conf.d/default.conf.: No such file or directory
[/] # docker exec 91d3279be4b6 cat /etc/nginx/conf.d/default.conf
# If we receive X-Forwarded-Proto, pass it through; otherwise, pass along the
# scheme used to connect to this server
map $http_x_forwarded_proto $proxy_x_forwarded_proto {
  default $http_x_forwarded_proto;
  ''      $scheme;
}
# If we receive X-Forwarded-Port, pass it through; otherwise, pass along the
# server port the client connected to
map $http_x_forwarded_port $proxy_x_forwarded_port {
  default $http_x_forwarded_port;
  ''      $server_port;
}
# If we receive Upgrade, set Connection to "upgrade"; otherwise, delete any
# Connection header that may have been passed to this server
map $http_upgrade $proxy_connection {
  default upgrade;
  '' close;
}
# Set appropriate X-Forwarded-Ssl header
map $scheme $proxy_x_forwarded_ssl {
  default off;
  https on;
}
gzip_types text/plain text/css application/javascript application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;
log_format vhost '$host $remote_addr - $remote_user [$time_local] '
                 '"$request" $status $body_bytes_sent '
                 '"$http_referer" "$http_user_agent"';
access_log off;
# HTTP 1.1 support
proxy_http_version 1.1;
proxy_buffering off;
proxy_set_header Host $http_host;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection $proxy_connection;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $proxy_x_forwarded_proto;
proxy_set_header X-Forwarded-Ssl $proxy_x_forwarded_ssl;
proxy_set_header X-Forwarded-Port $proxy_x_forwarded_port;
# Mitigate httpoxy attack (see README for details)
proxy_set_header Proxy "";
server {
        server_name _; # This is just an invalid value which will never trigger on a real hostname.
        listen 80;
        access_log /var/log/nginx/access.log vhost;
        return 503;
}
# jenkins.xxx.info
upstream 7388ea39588cd39638dc61b60d26fe329b4cdc1d {
                                ## Can be connect with "bridge" network
                # jenkins-1
                server 10.0.3.6 down;
}
server {
        server_name jenkins.xxx.info;
        listen 80 ;
        access_log /var/log/nginx/access.log vhost;
        location / {
                proxy_pass http://7388ea39588cd39638dc61b60d26fe329b4cdc1d;
        }
}

[bakerface]

I was getting the same error when running a simple nodejs service behind the nginx-proxy. It turns out I forgot to EXPOSE my port in the Dockerfile. After fixing that the proxy worked as expected. Not sure if this information helps you, but I figured it may be worth mentioning.

[tkw1536]

Solution in https://github.com/nginx-proxy/nginx-proxy/issues/693#issuecomment-282136792, closing.