java net ConnectException failed to connect to 192 168 253 3 port 2468 connect failed ECONNREFUSED Connection refused

Question

I want to transfer some data between PC and a mobile phone with WiFi   This is how I get the WiFi IP address   String ip    String format                        d  d  d  d                        wifiInfo getIpAddress    amp  0xff                        wifiInfo getIpAddress    gt  gt  8  amp  0xff                        wifiInfo getIpAddress    gt  gt  16  amp  0xff                        wifiInfo getIpAddress    gt  gt  24  amp  0xff     new Recive   execute ip     This is the code about sending a message to the PC   Socket socket   null  String message    test r n   protected Void doInBackground String    urls        try           Log i  ip   urls 0            socket   new Socket urls 0   2468           toserver   new DataOutputStream socket getOutputStream             toserver writeBytes message            toserver flush            toserver close            socket close            return null        catch  Exception e            Log i  e   e toString             return null            But an error occurs       java net ConnectException  failed to connect to  192 168 253 3  port 2468   connect failed  ECONNREFUSED  Connection refused    Besides  I use a android phone to run the app

User · Answer

first i used  localhost port  format met this error then I changed the address to  ip port  format and the problem solved

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I solved the same problem  I used a network connection through a proxy server  when I selected the option not to use proxies for internal and local connections  the problem disappeared

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A connect failed  ECONNREFUSED  Connection refused  most likely means that there is nothing listening on that port AND that IP address   Possible explanations include    the service has crashed or hasn t been  successfully   started  your client is trying to connect using the wrong IP address or port  your client is trying to connect using a DNS name that resolves to the wrong IP  or server access is being blocked by a firewall that is  refusing  on the server service s behalf   This is pretty unlikely given that normal practice  these days  is for firewalls to  blackhole  all unwanted connection attempts      Note that while you have an array variable called urls  it cannot contain real URLs   There is no overload of the Socket constructor that takes a real URL in any form   Indeed  if you supplied a URL in string form like this    new Socket  http   example com   42    the result would be a different exception  Likewise  if you attempt to connect to an IP address on a network that you can t route to  e g   a different WiFi network    then you will get a different exception  e g   host not found    no route to host  or  no route to network

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My problem was solved after turning Off Windows Firewall Defender in public network as I was connected with that network

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I was also getting the same issue I tried multiple IPs like my public IP and localhost default IP 127 0 0 1 in windows and default gateway but same response  but I forget to check by   C  gt  ipconfig   ipconfig cleanly say what is my actual IP address of that adapter with which I have connected like I was connected with Wifi adapter my IP address will show me as    Wireless LAN adapter Wireless Network Connection      Connection-specific DNS Suffix         Link-local IPv6 Address             fe80  69fa 9475 431e fad7 11    IPv4 Address                        192 168 15 92   I hope this will help you

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check the name of the database in a file where you established a connection

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Why this might have happened    The server couldn t send a response  Ensure that the backend is working properly at IP and port mentioned  SSL connections are being blocked  Fix this by importing SSL certificates   Less likely    Cookies not being sent Request timeout  Change request timeout

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you can covert domain to IP address because every Domain have specific IP address  then you will solve that issue  I hope this will help you

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A common mistake during development of an android app running on a Virtual Device on your dev machine is to forget that the virtual device is not the same host as your dev machine  So if your server is running on your dev machine you cannot use a  http   localhost      url as that will look for the server endpoint on the virtual device not your dev machine

[java] java.net.ConnectException: failed to connect to /192.168.253.3 (port 2468): connect failed: ECONNREFUSED (Connection refused)

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