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dovecot server connection problem

tejashwini
in General Discussion

Featured Replies

hi,

I have a problem while connecting to dovecot server from windows7 to linuxOS.

on the client side i use windows7 where my application is run, whereas on server side i use linuxOS where dovecot is installed.

when i connect through telnet 201.123.80.168 143 port (from windows7 to linux)i get following error:

Connecting to 201.123.80.168.....Could not open connection to the host , on port 143:connection failed

 

 

but when i try to connect between linuxOS(both server and client are RHEL) the connection gets established, but  the connection remains stabilised for few minutes only nevertheless i reconnect it.

 

Could any one help me!! i need to fix this issue immediately.

 

thank you,

Could you please test with a normal mail client and not via telnet? Do, verify that you have configured dovecot as Froxlor shows you and that the service is running. Also, post Mailserver logs

  • Author

Hi,

 

We have tested with thunderbird and the same problem persists..

Is there any special setting in Dovecot to enable Window clients to connect to dovecot?

I presume that the dovecot configuration is correct since we are able to connect from a linux client..

 

Awaiting your response..

 

thanks..

  • Author

when i run the application on client side(Windows7) and give the "tcpdump -i eth0"  command on server side(linux OS) and check for packet flow, i found the following details:


09:36:27.295156 IP (tos 0x0, ttl 128, id 2177, offset 0, flags [DF], proto TCP (6), length 40)
    200.100.10.10.55479 > abc.def.com.imap: Flags [.], cksum 0xcb36 (correct), ack 1, win 16425, length 0
09:36:27.297858 IP (tos 0x0, ttl 64, id 23770, offset 0, flags [DF], proto TCP (6), length 149)
    abc.def.com.imap > 200.100.10.10.55479: Flags [P.], cksum 0x346d (incorrect -> 0xe362), seq 1:110, ack 1, win 46, length 109
09:36:30.297177 IP (tos 0x0, ttl 64, id 23771, offset 0, flags [DF], proto TCP (6), length 149)
    abc.def.com.imap > 200.100.10.10.55479: Flags [P.], cksum 0x346d (incorrect -> 0xe362), seq 1:110, ack 1, win 46, length 109
09:36:36.297164 IP (tos 0x0, ttl 64, id 23772, offset 0, flags [DF], proto TCP (6), length 149)
    abc.def.com.imap > 200.100.10.10.55479: Flags [P.], cksum 0x346d (incorrect -> 0xe362), seq 1:110, ack 1, win 46, length 109
-------------------------------------------------------------------------------------------------------------------------------------------------------
 here,  200.100.10.10.55479-> client
           abc.def.com.imap->server

i am unable to rectify where exactly i am losing connectivity.
could you please suggest me
 

  • Author

when i run the application on client side(Windows7) and give the "tcpdump -i eth0" command on server side(linux OS) and check for packet flow, i found the following details:

09:36:27.295156 IP (tos 0x0, ttl 128, id 2177, offset 0, flags [DF], proto TCP (6), length 40) 200.100.10.10.55479 > abc.def.com.imap: Flags [.], cksum 0xcb36 (correct), ack 1, win 16425, length 0 09:36:27.297858 IP (tos 0x0, ttl 64, id 23770, offset 0, flags [DF], proto TCP (6), length 149) abc.def.com.imap > 200.100.10.10.55479: Flags [P.], cksum 0x346d (incorrect -> 0xe362), seq 1:110, ack 1, win 46, length 109 09:36:30.297177 IP (tos 0x0, ttl 64, id 23771, offset 0, flags [DF], proto TCP (6), length 149) abc.def.com.imap > 200.100.10.10.55479: Flags [P.], cksum 0x346d (incorrect -> 0xe362), seq 1:110, ack 1, win 46, length 109 09:36:36.297164 IP (tos 0x0, ttl 64, id 23772, offset 0, flags [DF], proto TCP (6), length 149)

abc.def.com.imap > 200.100.10.10.55479: Flags [P.], cksum 0x346d (incorrect -> 0xe362), seq 1:110, ack 1, win 46, length 109

here, 200.100.10.10.55479-> client abc.def.com.imap->server

i am unable to rectify where exactly i am losing connectivity. could you please suggest me

These are not error-messages. I was asking what your e-mail gives you as error. Also, check the server LOG files

  • Author

javax.mail.MessagingException: * BYE JavaMail Exception: java.net.SocketException: Connection reset;
  nested exception is:
        com.sun.mail.iap.ConnectionException: * BYE JavaMail Exception: java.net.SocketException: Connection reset
        at com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:616)
        at javax.mail.Service.connect(Service.java:291)
        at javax.mail.Service.connect(Service.java:172)
        at mail.ClientActions.login(ClientActions.java:293)
        at mail.MailView.submitActionPerformed(MailView.java:828)
        at mail.MailView.access$900(MailView.java:34)
        at mail.MailView$6.actionPerformed(MailView.java:266)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
        at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
        at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
        at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:272)
        at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:272)
        at java.awt.Component.processMouseEvent(Component.java:6216)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
        at java.awt.Component.processEvent(Component.java:5981)
        at java.awt.Container.processEvent(Container.java:2041)
        at java.awt.Component.dispatchEventImpl(Component.java:4583)
        at java.awt.Container.dispatchEventImpl(Container.java:2099)
        at java.awt.Component.dispatchEvent(Component.java:4413)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4556)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4220)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4150)
        at java.awt.Container.dispatchEventImpl(Container.java:2085)
        at java.awt.Window.dispatchEventImpl(Window.java:2475)
        at java.awt.Component.dispatchEvent(Component.java:4413)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
Caused by: com.sun.mail.iap.ConnectionException: * BYE JavaMail Exception: java.net.SocketException: Connection reset
        at com.sun.mail.iap.Protocol.handleResult(Protocol.java:345)
        at com.sun.mail.imap.protocol.IMAPProtocol.authplain(IMAPProtocol.java:529)
        at com.sun.mail.imap.IMAPStore.login(IMAPStore.java:662)
        at com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:596)
        ... 33 more

  • Author

when the connection fails i get the above error message on client side

Please test using a desktop mail client like Thunderbird

  • Author

We have tested with thunderbird and the same problem persists..

So whats Thunderbirds error message and please post SERVER logs...

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