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hello, i am trying to open a ssh tunnel, mailman.SshTunnel(bSmtp, sshHostname, sshPort); mailman.SshAuthenticatePw(bSmtp, ssu, ssp);

and in a loop i want to send emails mailman.SendEmail(email); and in that loop, after i send 10 emails with a smtp server , i want to change the smtp server or to add other smtp creditals and keep sending email through the same tunnel, the problem is that when i change the smtp host or creditals in the loop, the tunnel is dropped.. is that normal? i am not using the mailman.SshCloseTunnel(bSmtp); command inside the loop, and i tried with and without the mailman.CloseSmtpConnection(); after each email or after the 10 emails i send with the same smtp, same result, the tunnel is dropped. i can share the code if someone need it, but it is from the examples, i only added a loop and some conditions to change the smtp host and users after i send 10 emails, if i don't change anything i can send 1000 emails without the tunnel to be dropped.

this is the chilkat log after i send the first email

============================== 1 email ==============================

ChilkatLog:

SendEmail:

DllDate: Feb 15 2010

UnlockPrefix: *********

Username: Administrator

Component: .NET 2.0

Recipients:

  NumTo: 1

  To: ******@aol.com

  NumCC: 0

  NumBCC: 0

Need new SMTP connection

SMTP_Connect:

  Connecting to SMTP server smtpauth.earthlink.net:587

  smtp_host: smtpauth.earthlink.net

  smtp_port: 587

  smtp_user: ****@earthlink.net

  Opening new SSH channel within SSH tunnel.

  channelType: direct-tcpip

  clientChannel: 100

  initialWindowSize: 327680

  maxPacketSize: 8192

  directTcpHost: smtpauth.earthlink.net

  directTcpPort: 587

  originatorIP: xxx.xxx.xxx.xxx

  originatorPort: 3662

  Sent open channel request

  ClientChannelNum: 100

  ServerChannelNum: 0

  ServerInitialWindowSize: 24576

  ServerMaxPacketSize: 32768

  [SSH] Direct TCP/IP channel successfully opened.

  SshChannelNum: 100

  InitialResponse: 220-elasmtp-junco.atl.sa.earthlink.net ESMTP Exim 4.67 #1 Mon, 16 Jul 2012

``07:49:45 -0400 2 20-NO UCE. EarthLink does not authorize the use of its computers or network

220 equipment to accept, transmit, or distribute unsolicited e-mail.

  sendingHello: EHLO PC

  helloResponse: 250-elasmtp-junco.atl.sa.earthlink.net Hello Internet [xx.xx.xx.xx]

250-SIZE 29360128

250-PIPELINING

250-AUTH PLAIN LOGIN CRAM-MD5

250-STARTTLS

250 HELP

  login_method: LOGIN

  CONNECTED to ESMTP server smtpauth.earthlink.net:587

  ConnectionType: SSH Tunnel

subject: 350' Transmission & Engine61

reversePath: ******@cox.net

recipients:

  to: ******@aol.com

email_size: 700

Sent DATA terminator

Mail sent to 1 recipient

NumAccepted: 1

NumRejected: 0

===============================10 email ====================================

this is the chilkatlog i get after i send the 10'th email

ChilkatLog:

SendEmail:

DllDate: Feb 15 2010

UnlockPrefix: *********

Username: Administrator

Component: .NET 2.0

Recipients:

  NumTo: 1

  To: *******@aol.com

  NumCC: 0

  NumBCC: 0

Sending RSET command..

Using existing/open SMTP connection to send email.

ConnectionType: SSH Tunnel

subject: subject10

reversePath: *******@verizon.net

recipients:

  to: ******@aol.com

email_size: 708

Sent DATA terminator

Mail sent to 1 recipient

NumAccepted: 1

NumRejected: 0

Returning success status.

============================== 11 email ================================

and this is the log when i try to send number 11

ChilkatLog:

SendEmail:

DllDate: Feb 15 2010

UnlockPrefix: *********

Username: Administrator

Component: .NET 2.0

Recipients:

  NumTo: 1

  To: ******@aol.com

  NumCC: 0

  NumBCC: 0

Need new SMTP connection

SMTP_Connect:

  Connecting to SMTP server smtpauth.earthlink.net:587

  smtp_host: smtpauth.earthlink.net

  smtp_port: 587

  smtp_user: **********@earthlink.net

  Opening new SSH channel within SSH tunnel.

  channelType: direct-tcpip

  clientChannel: 101

  initialWindowSize: 327680

  maxPacketSize: 8192

  directTcpHost: smtpauth.earthlink.net

  directTcpPort: 587

  originatorIP: xxx.xxx.xxx.xxx

  originatorPort: 3662

  Sent open channel request

  SOCKET_ERROR: An existing connection was forcibly closed by the remote host.

  numBytesRequested: 16

  Failed to receive data on the TCP socket

  Failed to read data on SSH connection.

  Failed to read packet from SSH server.

  Failed to open direct-tcpip channel

  failCode: 0

  failReason:

  Failed to connect to SMTP server.

Failed to connect to SMTP server.

=================================================================

the xxx.xxx.xxx.xxx - is my ip address, and the xx.xx.xx.xx is the ssh server ip

asked Jul 16 '12 at 08:10

ceaifacut's gravatar image

ceaifacut
6224


Unfortunately, for now the ability to keep the same SSH tunnel but change the SMTP connection (i.e. open a new SSH channel) is not possible. This will be examined in a future version. (The current version at the time of this writing is v9.3.1)

link

answered Jul 17 '12 at 11:12

chilkat's gravatar image

chilkat ♦♦
11.8k316358421

ok,

thank you for your answer, now, i have another idea, what if instead of using

mailman.SshTunnel

we make a ssh tunnel forwarding the smtp port ex:

outgoing.verizon.net:465

to a local port ex: 10000

the smtp will then respond at 127.0.0.1:10000 going through the ssh tunnel,

is it possible to keep this tunnel for more smtp users of the same smtp server?

ex:

i am making this tunnel to outgoing.verizon.net:465 forwarded to local port 10000,

i am sending 10 emails with the user user1@verizon.net and his password pass1, after those 10 emails i

want to send using user2@verizon.net and pass2

i have done a quick test and it seems to work BUT after a while the tunnel crashes or something throwing this:

ChilkatLog:

SendEmail:

DllDate: Feb 15 2010

UnlockPrefix: *******

Username: Administrator

Component: .NET 2.0

Recipients:

  NumTo: 1

  To: *******@gmail.com

  NumCC: 0

  NumBCC: 0

Need new SMTP connection

SMTP_Connect:

  Connecting to SMTP server 127.0.0.1:10000

  smtp_host: 127.0.0.1

  smtp_port: 10000

  smtp_user: *****@verizon.net

  ConnectTimeoutMs: 20000

  Timeout waiting to read socket or accept connection

  timeoutMs: 30000

  InitialResponse:

  Failed to get initial SMTP response..

Failed to connect to SMTP server.

=======================================================================

and it never connects again, the timeout is not working, it tries to create a tunnel and send the email through it every second, it's not trying to send for 20 seconds as the ConnectTimeoutMs: 20000 says.. is there a way to reinitialize the Chilkat.SshTunnel sshTunnel = new Chilkat.SshTunnel(); so it is like the first time it loads? i have the

                    success = sshTunnel.StopAccepting();

and

                    success = sshTunnel.StopAllTunnels(1000);

set if it fails to send email.

i also have the success = sshTunnel.IsAccepting;

witch is returning true after

success = sshTunnel.BeginAccepting(port);

Thread.Sleep(100);

And one more thing i get,

xml version="1.0" encoding="utf-8" ?

tunnels>

tunnels>

like there are no tunnels..

when i use the

Console.WriteLine(sshTunnel.GetTunnelsXml());

right after i i test if the tunnel is accepting (success = sshTunnel.IsAccepting;)

i get this even when it works

link

answered Jul 17 '12 at 12:20

ceaifacut's gravatar image

ceaifacut
6224

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Asked: Jul 16 '12 at 08:10

Seen: 3,064 times

Last updated: Jul 17 '12 at 12:20

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