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How to close an existing SSH tunnel?

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1

0

In Windows, I create a scheduled task on Windows startup:

C:cygwin64binssh.exe -R 2222:127.0.0.1:3389 user@PublicHost

to expose my rdp service on a public-ip server, and I can connect rdp successfuly, but I cannot find ssh.exe in task manager, and when I shutdown windows, sometimes the 2222 port of PublicHost is not released, so later I boot windows again, the ssh.exe will give me a warning, port forwarding failed.

Is there a way to ask PublicHost to release the port (I don't have root access on PublicHost)?

windows ssh tunnel

share|improve this question

edited Sep 8 '16 at 16:17

MadHatter

70.3k11145207

asked Sep 8 '16 at 15:48

Kingzone WongKingzone Wong

62

bumped to the homepage by Community♦ 2 mins ago

This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.

add a comment | 

1

0

In Windows, I create a scheduled task on Windows startup:

C:cygwin64binssh.exe -R 2222:127.0.0.1:3389 user@PublicHost

to expose my rdp service on a public-ip server, and I can connect rdp successfuly, but I cannot find ssh.exe in task manager, and when I shutdown windows, sometimes the 2222 port of PublicHost is not released, so later I boot windows again, the ssh.exe will give me a warning, port forwarding failed.

Is there a way to ask PublicHost to release the port (I don't have root access on PublicHost)?

windows ssh tunnel

share|improve this question

edited Sep 8 '16 at 16:17

MadHatter

70.3k11145207

asked Sep 8 '16 at 15:48

Kingzone WongKingzone Wong

62

bumped to the homepage by Community♦ 2 mins ago

This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.

add a comment | 

In Windows, I create a scheduled task on Windows startup:

C:cygwin64binssh.exe -R 2222:127.0.0.1:3389 user@PublicHost

to expose my rdp service on a public-ip server, and I can connect rdp successfuly, but I cannot find ssh.exe in task manager, and when I shutdown windows, sometimes the 2222 port of PublicHost is not released, so later I boot windows again, the ssh.exe will give me a warning, port forwarding failed.

Is there a way to ask PublicHost to release the port (I don't have root access on PublicHost)?

windows ssh tunnel

share|improve this question

edited Sep 8 '16 at 16:17

MadHatter

70.3k11145207

asked Sep 8 '16 at 15:48

Kingzone WongKingzone Wong

62

C:cygwin64binssh.exe -R 2222:127.0.0.1:3389 user@PublicHost

share|improve this question

edited Sep 8 '16 at 16:17

MadHatter

70.3k11145207

asked Sep 8 '16 at 15:48

Kingzone WongKingzone Wong

62

share|improve this question

edited Sep 8 '16 at 16:17

MadHatter

70.3k11145207

asked Sep 8 '16 at 15:48

Kingzone WongKingzone Wong

62

edited Sep 8 '16 at 16:17

MadHatter

70.3k11145207

edited Sep 8 '16 at 16:17

MadHatter

70.3k11145207

asked Sep 8 '16 at 15:48

Kingzone WongKingzone Wong

62

asked Sep 8 '16 at 15:48

Kingzone WongKingzone Wong

62

2 Answers
2

active

oldest

votes

0

Can you run ssh in the foreground so that you get a shell prompt and can just logout of the ssh session?

Because if windows is shutting down and terminating ssh.exe, it should close that port. And if it's not getting released by the server, sending your own kill signal will likely have the same effect (if you could find it in task manager).

Or perhaps you could login (manual or scripted) into the PublicHost and kill things on that side (like /bin/bash of your UID) so the connection is dropped?

share|improve this answer

answered Sep 8 '16 at 16:02

Ryan BabchishinRyan Babchishin

5,16011032

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  When the windows is rebooted, I want the ssh.exe to be run even before I login. that's why I need a scheduled task. If I login to PublicHost, and kill all sshd related to the current user, all other normal ssh connection will also be dropped.
  
  – Kingzone Wong
  Sep 8 '16 at 16:34
  

  
  
  
  

add a comment | 

0

If you just connect to port 2222 of PublicHost it should attempt to send traffic through the tunnel. This will time out (after a few minutes) or receive a reset response (immediately), which will result in the connection being closed and the sshd process exiting.

You do this using any number of tools, but here's one way to do it automatically from Windows:

C:cygwin64binssh.exe user@PublicHost "echo x | nc 127.0.0.1 2222"

share|improve this answer

answered Sep 9 '16 at 3:48

Tom ShawTom Shaw

3,4641022

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I tried, it's OK, but you have to wait for a long-time timeout, and seems this timeout should be configured on PublicHost with root user?
  
  – Kingzone Wong
  Sep 10 '16 at 3:42
  

  
  
  
  

add a comment | 

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0

Can you run ssh in the foreground so that you get a shell prompt and can just logout of the ssh session?

Because if windows is shutting down and terminating ssh.exe, it should close that port. And if it's not getting released by the server, sending your own kill signal will likely have the same effect (if you could find it in task manager).

Or perhaps you could login (manual or scripted) into the PublicHost and kill things on that side (like /bin/bash of your UID) so the connection is dropped?

share|improve this answer

answered Sep 8 '16 at 16:02

Ryan BabchishinRyan Babchishin

5,16011032

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  When the windows is rebooted, I want the ssh.exe to be run even before I login. that's why I need a scheduled task. If I login to PublicHost, and kill all sshd related to the current user, all other normal ssh connection will also be dropped.
  
  – Kingzone Wong
  Sep 8 '16 at 16:34
  

  
  
  
  

add a comment | 

0

Can you run ssh in the foreground so that you get a shell prompt and can just logout of the ssh session?

Because if windows is shutting down and terminating ssh.exe, it should close that port. And if it's not getting released by the server, sending your own kill signal will likely have the same effect (if you could find it in task manager).

Or perhaps you could login (manual or scripted) into the PublicHost and kill things on that side (like /bin/bash of your UID) so the connection is dropped?

share|improve this answer

answered Sep 8 '16 at 16:02

Ryan BabchishinRyan Babchishin

5,16011032

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  When the windows is rebooted, I want the ssh.exe to be run even before I login. that's why I need a scheduled task. If I login to PublicHost, and kill all sshd related to the current user, all other normal ssh connection will also be dropped.
  
  – Kingzone Wong
  Sep 8 '16 at 16:34
  

  
  
  
  

add a comment | 

Can you run ssh in the foreground so that you get a shell prompt and can just logout of the ssh session?

Because if windows is shutting down and terminating ssh.exe, it should close that port. And if it's not getting released by the server, sending your own kill signal will likely have the same effect (if you could find it in task manager).

Or perhaps you could login (manual or scripted) into the PublicHost and kill things on that side (like /bin/bash of your UID) so the connection is dropped?

share|improve this answer

answered Sep 8 '16 at 16:02

Ryan BabchishinRyan Babchishin

5,16011032

share|improve this answer

answered Sep 8 '16 at 16:02

Ryan BabchishinRyan Babchishin

5,16011032

answered Sep 8 '16 at 16:02

Ryan BabchishinRyan Babchishin

5,16011032

answered Sep 8 '16 at 16:02

Ryan BabchishinRyan Babchishin

5,16011032

0

If you just connect to port 2222 of PublicHost it should attempt to send traffic through the tunnel. This will time out (after a few minutes) or receive a reset response (immediately), which will result in the connection being closed and the sshd process exiting.

You do this using any number of tools, but here's one way to do it automatically from Windows:

C:cygwin64binssh.exe user@PublicHost "echo x | nc 127.0.0.1 2222"

share|improve this answer

answered Sep 9 '16 at 3:48

Tom ShawTom Shaw

3,4641022

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I tried, it's OK, but you have to wait for a long-time timeout, and seems this timeout should be configured on PublicHost with root user?
  
  – Kingzone Wong
  Sep 10 '16 at 3:42
  

  
  
  
  

add a comment | 

0

If you just connect to port 2222 of PublicHost it should attempt to send traffic through the tunnel. This will time out (after a few minutes) or receive a reset response (immediately), which will result in the connection being closed and the sshd process exiting.

You do this using any number of tools, but here's one way to do it automatically from Windows:

C:cygwin64binssh.exe user@PublicHost "echo x | nc 127.0.0.1 2222"

share|improve this answer

answered Sep 9 '16 at 3:48

Tom ShawTom Shaw

3,4641022

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I tried, it's OK, but you have to wait for a long-time timeout, and seems this timeout should be configured on PublicHost with root user?
  
  – Kingzone Wong
  Sep 10 '16 at 3:42
  

  
  
  
  

add a comment | 

If you just connect to port 2222 of PublicHost it should attempt to send traffic through the tunnel. This will time out (after a few minutes) or receive a reset response (immediately), which will result in the connection being closed and the sshd process exiting.

You do this using any number of tools, but here's one way to do it automatically from Windows:

C:cygwin64binssh.exe user@PublicHost "echo x | nc 127.0.0.1 2222"

share|improve this answer

answered Sep 9 '16 at 3:48

Tom ShawTom Shaw

3,4641022

C:cygwin64binssh.exe user@PublicHost "echo x | nc 127.0.0.1 2222"

share|improve this answer

answered Sep 9 '16 at 3:48

Tom ShawTom Shaw

3,4641022

answered Sep 9 '16 at 3:48

Tom ShawTom Shaw

3,4641022

answered Sep 9 '16 at 3:48

Tom ShawTom Shaw

3,4641022