Problem reading pop3 mailbox

[jdbruijn]

I'm trying to read a pop3 mailbox using SSL, i've got it working on my developer in both a sample solution and in the main solution.
But when I upload the solutions to our production server I get a connection refused error.

This is the code of my test function:

Code: Select all

   var _mail_prop = []
      
   _mail_prop[0] = 'mail.pop3.host='+ _server;
   _mail_prop[1] = 'mail.pop3.ssl.enable=true';
   _mail_prop[2] = 'mail.pop3.port='+ _port;
   _mail_prop[3] = 'mail.pop3.auth=true';
   _mail_prop[4] = 'mail.pop3.user='+_login;
   //Receive mails from pop3 account.

   application.output(_mail_prop);
   try{
      var _msgs = plugins.mail.receiveMail( _login,  _pwd,  true,  0,  null, _mail_prop)
      if (_msgs != null) //if is null error occurred!
      {
         application.output(_msgs.length + " messages in mailbox ", LOGGINGLEVEL.INFO)   
      } else {
         application.output("Error connecting to POP account ", LOGGINGLEVEL.DEBUG)
      }
   }catch(E){
      application.output(E.message)
   }


Error:

javax.mail.MessagingException: Connect failed;
nested exception is:
java.net.ConnectException: Connection refused: connect
at com.sun.mail.pop3.POP3Store.protocolConnect(POP3Store.java:210)
at javax.mail.Service.connect(Service.java:295)
at javax.mail.Service.connect(Service.java:176)
at com.servoy.extensions.plugins.mail.MailServer.receiveMail(MailServer.java:394)
at com.servoy.extensions.plugins.mail.client.MailProvider.receiveMail(MailProvider.java:297)
at com.servoy.extensions.plugins.mail.client.MailProvider.js_receiveMail(MailProvider.java:278)
at sun.reflect.GeneratedMethodAccessor489.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.mozilla.javascript.MemberBox.invoke(MemberBox.java:179)
at org.mozilla.javascript.NativeJavaMethod.call(NativeJavaMethod.java:367)
at org.mozilla.javascript.Interpreter.interpretLoop(Interpreter.java:3666)
at org.mozilla.javascript.Interpreter.interpret(Interpreter.java:2680)
at org.mozilla.javascript.InterpretedFunction.call(InterpretedFunction.java:166)
at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:387)
at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3135)
at org.mozilla.javascript.InterpretedFunction.call(InterpretedFunction.java:165)
at com.servoy.j2db.scripting.ScriptEngine.executeFunction(ScriptEngine.java:537)
at com.servoy.j2db.plugins.ClientPluginAccessProvider$MethodExecutor.run(ClientPluginAccessProvider.java:514)
at com.servoy.j2db.server.headlessclient.SessionClient.invokeAndWait(SessionClient.java:1209)
at com.servoy.j2db.server.headlessclient.SessionClient.invokeLater(SessionClient.java:1199)
at com.servoy.j2db.plugins.ClientPluginAccessProvider$1.run(ClientPluginAccessProvider.java:441)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(Unknown Source)
at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:288)
at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:231)
at com.sun.mail.pop3.Protocol.<init>(Protocol.java:107)
at com.sun.mail.pop3.POP3Store.getPort(POP3Store.java:261)
at com.sun.mail.pop3.POP3Store.protocolConnect(POP3Store.java:206)
... 24 more

The mailbox is available from any ip address according to the customer and our server provider tells me that the server should be able to connect through the ssl-port.

Can anybody see what i'm doing wrong here? I'm lost and i've got an angry customer asking me why this isn't working.

[Harjo]

what happens if you do:

Code: Select all

telnet pop.googlemail.com 995

on the server?

I assume you are using the same/ or other domainname and port?

[jdbruijn]

I'm not sure what response i'm supposed to get. When I enter that into a command prompt, I get a black windows with a blinking cursor and after a while the prompt returns.
This happens for both the googlemail and my customer server.

I've uploaded the test solution to a testserver on my local domain (which is 6.1 not 6.0 as the production server) I get the same error: connection refused

[Harjo]

yes that means indeed the port 995 is not blocked, and you have access to that domain and port.

Are you doing this in smart-client or web-client?
if in smart-client, you could try to test it in web-client, because that has a different way of class loading....

what you also could try is testing this with a gmail acount (be sure pop3 is enabled) what happens than?

[jdbruijn]

Tried with gmail account, but same results:
it works in my developer
it does not work on the production server, my local test server (tested both web- and smartclient)

[jdbruijn]

After a restart of the server the problem seemed to be gone. I was able to read the email box for a couple of weeks.
But now the problem is back again:
My development machine can access the mailbox, but the server gets the same error again:

Code: Select all

javax.mail.MessagingException: Connect failed;
     nested exception is:
       java.net.ConnectException: Connection refused: connect
       at com.sun.mail.pop3.POP3Store.protocolConnect(POP3Store.java:210)
       at javax.mail.Service.connect(Service.java:295)
       at javax.mail.Service.connect(Service.java:176)
       at com.servoy.extensions.plugins.mail.MailServer.receiveMail(MailServer.java:394)
       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
       at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
       at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
       at java.lang.reflect.Method.invoke(Unknown Source)
       at sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
       at sun.rmi.transport.Transport$1.run(Unknown Source)
       at java.security.AccessController.doPrivileged(Native Method)
       at sun.rmi.transport.Transport.serviceCall(Unknown Source)
       at sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
       at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
       at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
       at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
       at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
       at java.lang.Thread.run(Unknown Source)
    Caused by: java.net.ConnectException: Connection refused: connect
       at java.net.PlainSocketImpl.socketConnect(Native Method)
       at java.net.PlainSocketImpl.doConnect(Unknown Source)
       at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
       at java.net.PlainSocketImpl.connect(Unknown Source)
       at java.net.SocksSocketImpl.connect(Unknown Source)
       at java.net.Socket.connect(Unknown Source)
       at java.net.Socket.connect(Unknown Source)
       at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:288)
       at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:231)
       at com.sun.mail.pop3.Protocol.<init>(Protocol.java:107)
       at com.sun.mail.pop3.POP3Store.getPort(POP3Store.java:261)
       at com.sun.mail.pop3.POP3Store.protocolConnect(POP3Store.java:206)
       ... 17 more

Has anybody got any suggestions for me on how to permanently fix this problem?

[Harjo]

if nothing has changed, something is going on with your email-server.
are there not any ban-restrictions (too many connections? too many wrong login's ) that has banned the ip-address of your server?

[jdbruijn]

I'll ask if this can be an issue.
However I think it is not, because I can replicate the problem on my test server while I don't have an issue on my development machine. Both the test server and development machine access the web through the same IP. So I would expect neither of them to be able to connect

[jdbruijn]

i've tried the following website on the server and it shows it can connect to the pop3 box:
https://www.wormly.com/test_pop3_mail_server

So the problem is not in the connection to the pop3 box, but it is in my servoy solution.

[Harjo]

You could try to use the free mailPro plugin Dr Maison, for a quick test.

[jdbruijn]

when I try to read the mailbox using outlook express I get a Certificate warning. When I have accepted the warning (one time only) OE can read the mailbox.
Can this be a reason why the plugin cannot access the mailbox?

[Harjo]

ah, yes, that could be indeed a problem! try the mailPro plugin, I believe that one has better support for that.

[jdbruijn]

The MailPro plugin does seem to accept the connection, so i guess i'll just have to rewrite some parts of my mail handling to use the mailpro plugin.