Could not connect to SMTP host localhost port 25 nested exception is java net ConnectException Connection refused connect

Question

I m doing application for send email from localhost in jsp  amp  i found error like Could not connect to SMTP host  localhost  port  25  nested exception is  java net ConnectException  Connection refused  connect plz check and give me solution or idea if you have  for that i m using below code    Thanking you in advance     lt    page language  java  import  javax naming   java io   javax mail    javax mail internet   com sun mail smtp     gt    lt html gt   lt head gt   lt title gt Mail lt  title gt   lt  head gt    lt body gt    lt   try    Session mailSession   Session getInstance System getProperties        Transport transport   new SMTPTransport mailSession new URLName  localhost        transport connect  localhost  25 null null       MimeMessage m   new MimeMessage mailSession      m setFrom new InternetAddress   gt  lt  request getParameter  from    gt  lt         Address   toAddr   new InternetAddress                   new InternetAddress   gt  lt  request getParameter  to    gt  lt                     m setRecipients javax mail Message RecipientType TO  toAddr       m setSubject   gt  lt  request getParameter  subject    gt  lt        m setSentDate new java util Date        m setContent   gt  lt  request getParameter  description    gt  lt     text plain       transport sendMessage m m getAllRecipients        transport close       out println  Thanks for sending mail       catch Exception e      out println e getMessage       e printStackTrace        gt     lt  body gt    lt  html gt

User · Answer

The mail server on CentOS 6 and other IPv6 capable server platforms may be bound to IPv6 localhost (::1) instead of IPv4 localhost (127.0.0.1).

Typical symptoms:

[root@host /]# telnet 127.0.0.1 25
Trying 127.0.0.1...
telnet: connect to address 127.0.0.1: Connection refused

[root@host /]# telnet localhost 25
Trying ::1...
Connected to localhost.
Escape character is '^]'.
220 host ESMTP Exim 4.72 Wed, 14 Aug 2013 17:02:52 +0100

[root@host /]# netstat -plant | grep 25
tcp        0      0 :::25                       :::*                        LISTEN      1082/exim

If this happens, make sure that you don't have two entries for localhost in /etc/hosts with different IP addresses, like this (bad) example:

[root@host /]# cat /etc/hosts
127.0.0.1 localhost.localdomain localhost localhost4.localdomain4 localhost4
::1       localhost localhost.localdomain localhost6 localhost6.localdomain6

To avoid confusion, make sure you only have one entry for localhost, preferably an IPv4 address, like this:

[root@host /]# cat /etc/hosts
127.0.0.1 localhost  localhost.localdomain   localhost4.localdomain4 localhost4
::1       localhost6 localhost6.localdomain6

User · Answer

First you have to ensure that there is a SMTP server listening on port 25   To look whether you have the service  you can try using TELNET client  such as   C   gt  telnet localhost 25    telnet client by default is disabled on most recent versions of Windows  you have to add enable the Windows component from Control Panel  In Linux UNIX usually telnet client is there by default     telnet localhost 25   If it waits for long then time out  that means you don t have the required SMTP service  If successfully connected you enter something and able to type something  the service is there   If you don t have the service  you can use these    A mock SMTP server that will mimic the behavior of actual SMTP server  as you are using Java  it is natural to suggest Dumbster fake SMTP server  This even can be made to work within JUnit tests  with setup tear down validation   or independently run as separate process for integration test  If your host is Windows  you can try installing Mercury email server  also comes with WAMPP package from Apache Friends  on your local before running above code   If your host is Linux or UNIX  try to enable the mail service such as Postfix  Another full blown SMTP server in Java  such as Apache James mail server    If you are sure that you already have the service  may be the SMTP requires additional security credentials  If you can tell me what SMTP server listening on port 25 I may be able to tell you more

[email] Could not connect to SMTP host: localhost, port: 25; nested exception is: java.net.ConnectException: Connection refused: connect

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