502 Bad Gateway errors from Nginx when trying to access Tomcat

[gischethans]

I have JIRA and Nginx running on the same server with Nginx installed to
serve as a reverse proxy. From what I learnt from various sources, in the
Tomcat server.xml file, I must add an address="127.0.0.1" attribute so that
Tomcat does not listen to outside IPs. But once I add that to my 8080 and
8443 connectors, things stop working i.e., the JIRA site becomes
inaccessible. Browser displays Connection refused / connection timed out
errors. Trying to access the site through curl gives me 502 Bad gateway
error. I have also checked the Nginx error log which shows this - 

connect() failed (111: Connection refused) while connecting to upstream,
client: <IP Address>, server: <FQDN>, request: "GET / HTTP/1.1", upstream:
"http://<IP>:8080/", host: <FQDN>

Here is my nginx.conf 
user  nginx;
worker_processes  1;

error_log  /var/log/nginx/error.log warn;
pid        /var/run/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request"
'
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    keepalive_timeout  65;

    #gzip  on;

    include /etc/nginx/conf.d/*.conf;
    include /etc/nginx/sites-enabled/*;
}

and the entire content of the file for sites-enabled

server {
        listen 80;
        

        server_name test-pcrdesk.ingrnet.com;
        location / {
        
                proxy_pass http://<IP>:8080/; #Here I have tried the real IP
of the server, localhost, FQDN with and without port 8080, almost anything I
could think of
                proxy_set_header X-Real-IP $remote_addr;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_set_header Host $host;
               
        
}
}

Here is server.xml file configuration for Tomcat.
<Connector port="8080" 
address="127.0.0.1" 
maxThreads="150" 
minSpareThreads="25" 
connectionTimeout="20000" 
enableLookups="false" 
maxHttpHeaderSize="8192" 
protocol="HTTP/1.1" 
useBodyEncodingForURI="true" 
acceptCount="100" 
redirectPort="8443" 
disableUploadTimeout="true" 
proxyName=<FQDN> 
proxyPort="80"/>

<Connector port="8443" 
address="127.0.0.1" 
SSLEnabled="true" 
acceptCount="100" 
clientAuth="false" 
connectionTimeout="20000" 
disableUploadTimeout="true" 
enableLookups="false" 
keyAlias=<value> 
keystoreFile=<jks file> 
keystorePass=<password> 
keystoreType="JKS" 
maxHttpHeaderSize="8192" 
maxSpareThreads="75" 
maxThreads="150" 
minSpareThreads="25"  
protocol="org.apache.coyote.http11.Http11Protocol" 
scheme="https" 
secure="true" 
sslProtocol="TLS" 
useBodyEncodingForURI="true"/>

What is wrong with my configuration?

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,266336,266336#msg-266336