Problem using ssh client in kubuntu 15.04, -R is not working.

Tue May 5 15:19:22 UTC 2015

2015-04-26 11:54 GMT+03:00 Colin Watson <cjwatson at ubuntu.com>:

> On Fri, Apr 24, 2015 at 07:31:46PM +0300, Антон Мацюк wrote:
> > Hi! I have a problem using kubuntu 15.04: When I do "ssh -l user -p 44
> > -L 8090:localhost:8090 -L 1234:localhost:5900 -R 5700:localhost:5900
> > my.hostname.org -N" - it opens connection, but when I try to use 5700
> > at remote computer, it says in local console "WARNING: Server requests
> > forwarding for unknown listen_port 5700". I'll appreciate any help.
>
> You say that you're trying to use port 5700 on the remote system, but
> you haven't said which host name you were trying to use.  If you aren't
> sure, adding the -v option to ssh should cause it to emit a debug
> message something like:
>
>   debug1: client_request_forwarded_tcpip: listen localhost port 5700,
> originator 127.0.0.1 port 49286
>
> ... when you try to connect.  I would expect to see your symptoms if
> you're trying to connect to something other than localhost.  If you
> actually need to connect to something other than localhost at the remote
> end, you'll need to enable GatewayPorts on the server and specify a
> bind_address to ssh -R; see the ssh(1) and sshd_config(5) manual pages
> for details.
>
> > It looks like some bug.
>
> I think this is very likely to be a configuration mistake rather than a
> bug; the forwarding facility itself works fine.
>

Colin, thanks for a tip, I now have a workaround :)
Sorry to be absent for a long time, was busy time working.

Here is some logs, I just changed "localhost" to "127.0.0.1" and now it
works (the "other side" is a Win7 with WinSSHD):

$ ssh -v -l user -p 44 -L 8090:localhost:8090 -L 1234:localhost:5900 -R
localhost:5700:localhost:5900 -R localhost:2222:localhost:22 my.hostname.org
-N

debug1: Local version string SSH-2.0-OpenSSH_6.7p1 Ubuntu-5ubuntu1
debug1: Remote protocol version 2.0, remote software version 5.32 FlowSsh:
Bitvise SSH Server (WinSSHD) 6.24: free only for personal non-commercial use
debug1: no match: 5.32 FlowSsh: Bitvise SSH Server (WinSSHD) 6.24: free
only for personal non-commercial use
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-sha2-256 zlib
debug1: kex: client->server aes128-ctr hmac-sha2-256 zlib
debug1: sending SSH2_MSG_KEX_ECDH_INIT
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: DSA -=-changed here-=-
debug1: Host '[my.hostname.org]:44' is known and matches the DSA host key.
debug1: Found key in /home/user/.ssh/known_hosts:1
debug1: Enabling compression at level 6.
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: Roaming not allowed by server
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,password
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /home/user/.ssh/id_rsa
debug1: Server accepts key: pkalg ssh-rsa blen 279
debug1: Authentication succeeded (publickey).
Authenticated to my.hostname.org (via proxy).
debug1: Local connections to LOCALHOST:8090 forwarded to remote address
localhost:8090
debug1: Local forwarding listening on ::1 port 8090.
debug1: channel 0: new [port listener]
debug1: Local forwarding listening on 127.0.0.1 port 8090.
debug1: channel 1: new [port listener]
debug1: Local connections to LOCALHOST:1234 forwarded to remote address
localhost:5900
debug1: Local forwarding listening on ::1 port 1234.
debug1: channel 2: new [port listener]
debug1: Local forwarding listening on 127.0.0.1 port 1234.
debug1: channel 3: new [port listener]
debug1: Remote connections from LOCALHOST:5700 forwarded to local address
localhost:5900
debug1: Remote connections from LOCALHOST:2222 forwarded to local address
localhost:22
debug1: Entering interactive session.
debug1: remote forward success for: listen 5700, connect localhost:5900
debug1: remote forward success for: listen 2222, connect localhost:22
debug1: All remote forwarding requests processed
debug1: Connection to port 1234 forwarding to localhost port 5900 requested.
debug1: channel 4: new [direct-tcpip]
debug1: client_input_channel_open: ctype forwarded-tcpip rchan 1 win 262144
max 65536
debug1: client_request_forwarded_tcpip: listen 127.0.0.1 port 2222,
originator 127.0.0.1 port 61360
WARNING: Server requests forwarding for unknown listen_port 2222
debug1: failure forwarded-tcpip
debug1: client_input_channel_open: ctype forwarded-tcpip rchan 2 win 262144
max 65536
debug1: client_request_forwarded_tcpip: listen 127.0.0.1 port 5700,
originator 127.0.0.1 port 61423
WARNING: Server requests forwarding for unknown listen_port 5700
debug1: failure forwarded-tcpip
debug1: channel 4: free: direct-tcpip: listening port 1234 for localhost
port 5900, connect from 127.0.0.1 port 50061 to 127.0.0.1 port 1234,
nchannels 5

-=- now I am doing "127.0.0.1" instead of "localhost" and forwarding works
well -=-

$ ssh -v -l user -p 44 -L 8090:localhost:8090 -L 1234:localhost:5900 -R
127.0.0.1:5700:127.0.0.1:5900 -R 127.0.0.1:2222:127.0.0.1:22 my.hostname.org
-N

debug1: Local version string SSH-2.0-OpenSSH_6.7p1 Ubuntu-5ubuntu1
debug1: Remote protocol version 2.0, remote software version 5.32 FlowSsh:
Bitvise SSH Server (WinSSHD) 6.24: free only for personal non-commercial use
debug1: no match: 5.32 FlowSsh: Bitvise SSH Server (WinSSHD) 6.24: free
only for personal non-commercial use
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-sha2-256 zlib
debug1: kex: client->server aes128-ctr hmac-sha2-256 zlib
debug1: sending SSH2_MSG_KEX_ECDH_INIT
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: DSA -=-changed here-=-
debug1: Host '[my.hostname.org]:44' is known and matches the DSA host key.
debug1: Found key in /home/user/.ssh/known_hosts:1
debug1: Enabling compression at level 6.
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: Roaming not allowed by server
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,password
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /home/user/.ssh/id_rsa
debug1: Server accepts key: pkalg ssh-rsa blen 279
debug1: Authentication succeeded (publickey).
Authenticated to my.hostname.org (via proxy).
debug1: Local connections to LOCALHOST:8090 forwarded to remote address
localhost:8090
debug1: Local forwarding listening on ::1 port 8090.
debug1: channel 0: new [port listener]
debug1: Local forwarding listening on 127.0.0.1 port 8090.
debug1: channel 1: new [port listener]
debug1: Local connections to LOCALHOST:1234 forwarded to remote address
localhost:5900
debug1: Local forwarding listening on ::1 port 1234.
debug1: channel 2: new [port listener]
debug1: Local forwarding listening on 127.0.0.1 port 1234.
debug1: channel 3: new [port listener]
debug1: Remote connections from 127.0.0.1:5700 forwarded to local address
127.0.0.1:5900
debug1: Remote connections from 127.0.0.1:2222 forwarded to local address
127.0.0.1:22
debug1: Entering interactive session.
debug1: remote forward success for: listen 127.0.0.1:5700, connect
127.0.0.1:5900
debug1: remote forward success for: listen 127.0.0.1:2222, connect
127.0.0.1:22
debug1: All remote forwarding requests processed
debug1: Connection to port 1234 forwarding to localhost port 5900 requested.
debug1: channel 4: new [direct-tcpip]
debug1: client_input_channel_open: ctype forwarded-tcpip rchan 1 win 262144
max 65536
debug1: client_request_forwarded_tcpip: listen 127.0.0.1 port 5700,
originator 127.0.0.1 port 64668
debug1: connect_next: host 127.0.0.1 ([127.0.0.1]:5900) in progress, fd=10
debug1: channel 5: new [127.0.0.1]
debug1: confirm forwarded-tcpip
debug1: channel 5: connection failed: Connection refused
connect_to 127.0.0.1 port 5900: failed.
debug1: channel 5: free: 127.0.0.1, nchannels 6
debug1: client_input_channel_open: ctype forwarded-tcpip rchan 2 win 262144
max 65536
debug1: client_request_forwarded_tcpip: listen 127.0.0.1 port 2222,
originator 127.0.0.1 port 64868
debug1: connect_next: host 127.0.0.1 ([127.0.0.1]:22) in progress, fd=10
debug1: channel 5: new [127.0.0.1]
debug1: confirm forwarded-tcpip
debug1: channel 5: connected to 127.0.0.1 port 22
debug1: channel 5: free: 127.0.0.1, nchannels 6
debug1: client_input_channel_open: ctype forwarded-tcpip rchan 3 win 262144
max 65536
debug1: client_request_forwarded_tcpip: listen 127.0.0.1 port 5700,
originator 127.0.0.1 port 65225
debug1: connect_next: host 127.0.0.1 ([127.0.0.1]:5900) in progress, fd=10
debug1: channel 5: new [127.0.0.1]
debug1: confirm forwarded-tcpip
debug1: channel 5: connection failed: Connection refused
connect_to 127.0.0.1 port 5900: failed.
debug1: channel 5: free: 127.0.0.1, nchannels 6
debug1: client_input_channel_open: ctype forwarded-tcpip rchan 4 win 262144
max 65536
debug1: client_request_forwarded_tcpip: listen 127.0.0.1 port 5700,
originator 127.0.0.1 port 49238
debug1: connect_next: host 127.0.0.1 ([127.0.0.1]:5900) in progress, fd=10
debug1: channel 5: new [127.0.0.1]
debug1: confirm forwarded-tcpip
debug1: channel 5: connected to 127.0.0.1 port 5900
debug1: channel 5: free: 127.0.0.1, nchannels 6
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