Node js connect only works on localhost

Question

I ve written a small Node js app  using connect  that serves up a web page  then sends it regular updates   It also accepts and logs user observations to a disk file  It works fine as long as I am on localhost  but I can t get other computers on the same intranet to see it  I am using port 3000  but changing to port 8080 or 80 didn t help  Here is the code I am using to set up the connection  var io   require  socket io      connect   require  connect     var app   connect   use connect static  public    listen 3000   var chat room   io listen app    As stated above  I ve tried changing the port number to 8080 or to 80  and didn t see any difference  so I don t think that it is a firewall problem  but I could be wrong   I ve also thought about  after reading similar questions dealing with HTTP  to add 0 0 0 0 to the listen   method but it doesn t seem that listen   takes an IP mask parameter

User · Answer

After struggling with this issue for quite some time I managed to solve it by allowing incoming connections on port 8080.

Since you wrote that the .listen(8080, "0.0.0.0") solution didn't work for you, make sure the connections on port 8080 are allowed through your firewall.

This post helped me to create a new Inbound rule in windows firewall settings.

User · Answer

Working for me with this line  simply add --listen when running     node server js -p 3000 -a   --listen 192 168 1 100   Hope it helps

User · Answer

Same problem here  for me solution was in editing server js file line 161  var server   app listen argv port      lt server ip adress here gt      function      console log  Cesium development server running publicly   Connect to localhost  d    server address   port            replace  localhost gt  with  lt server ip adress here gt

User · Answer

Binding to 0 0 0 0 is half the battle  There is an ip firewall  different from the one in system preferences  that blocks TCP ports  Hence port must be unblocked there as well by doing   sudo ipfw add  lt PORT NUMBER gt  allow tcp from any to any

User · Answer

To gain access for other users to your local machine  i usually use ngrok  Ngrok exposes your localhost to the web  and has an NPM wrapper that is simple to install and start     npm install ngrok -g   ngrok http 3000   See this example usage     In the above example  the locally running instance of sails at  localhost 3000 is now available on the Internet served at  http   69f8f0ee ngrok io or https   69f8f0ee ngrok io

User · Answer

CHECK YOUR ANTI-VIRUS FIREWALL SETTINGS  I have a NodeJS server working on Windows 10 PC  but when I put the IP address and port  example http   102 168 1 123 5000  into another computer s browser on my local network nothing happened  although it worked OK on the host computer   To find your windows IP address run CMD  then IPCONFIG  Bar Horing Amir s answer points to the Windows firewall settings  On My PC the Windows Firewall was turned off - as McAfee anti-virus has added its own Firewall  My system started to work on other computers after I added port 5000 to  Ports and Systems Services  under the McAfee Firewall settings on the computer with NodeJS on it  Other anti-virus software will have similar settings  I would seriously suggest trying this solution first with Windows

User · Answer

in my case I had to use both symbolic IP address  quot 0 0 0 0 quot  and call back while listen to server  quot cors quot    quot  2 8 5 quot    quot express quot    quot  4 17 1 quot   const cors   require  quot cors quot    app use cors      const port   process env PORT    8000  app listen port  quot 0 0 0 0 quot        gt      console log  Server is running on port   port          you can also use  your local IP address instead of  quot 0 0 0 0 quot   In OS Ubuntu you can find your Ip address by using command ifconfig   grep  quot inet  quot    grep -v 127 0 0 1   Then use the Ip Address  app listen port  quot 192 168 0 131 quot        gt      console log  Server is running on port   port          If you use fixed Ip address such as  quot 192 168 0 131 quot   then you must use it while calling to the server  such as  My api calling configuration for react client is bellow  REACT APP API URL   http   192 168 0 131 8001 api

User · Answer

On your app  makes it reachable from any device in the network   app listen 3000   0 0 0 0      For NodeJS in Azure  GCP  amp  AWS  For Azure vm deployed in resource manager  check your virtual network security group and open ports or port ranges to make it reachable  otherwise in your cloud endpoints if vm is deployed in old version of azure   Just look for equivalent of it for GCP and AWS

User · Answer

I have a very simple solution for this problem  process argv gives you a list of arguments passed to node app  So if you run   node server js 0 0 0 0   You ll get   process argv 0      gt   node  process argv 1      gt   server js  process argv 2      gt   0 0 0 0    So you can use process argv 2  to specify that as the IP address you want to listen to   http listen 3000  process argv 2      Now  your app is listening to  all  IP addresses  for example http   192 168 1 4 3000 your app   I hope this will help someone

User · Answer

Fedora or Centos distro check your selinux and firewalld in my case firewalld prevented the connection    Selinux   sestatus SELinux status                  enabled SELinuxfs mount                  sys fs selinux SELinux root directory           etc selinux Loaded policy name              targeted Current mode                      checkmode   Mode from config file             checkconfig   Policy MLS status               enabled Policy deny unknown status      allowed Max kernel policy version       30  Firewalld status   systemctl status firewalld

User · Answer

Most probably your server socket is bound to the loopback IP address 127 0 0 1 instead of the  all IP addresses  symbolic IP 0 0 0 0  note this is NOT a netmask   To confirm this  run sudo netstat -ntlp  If you are on linux  or netstat -an -f inet -p tcp   grep LISTEN  OSX  and check which IP your process is bound to  look for the line with   3000    If you see  127 0 0 1   that s the problem  Fix it by passing  0 0 0 0  to the listen call   var app   connect   use connect static  public    listen 3000   0 0 0 0

[node.js] Node.js connect only works on localhost

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