I want to use ssh port forwarding. I haven't used this feature for a few years, so I may have forgotten something obvious, or OS defaults may have changed.
I have tried this on three different machines (all Ubuntu 9.10). The debug says that it is opening the ports for listening. They must be going away immediately and silently.
I've checked that I can reach 192.168.1.8:80 from my local machine.
There's probably a very simple reason, but I've not found it in 20 minutes of googling.
Any idea what the problem could be?
root@chris-desktop:~# ssh -v -L 3142:192.168.1.8:80 yellow.example.com OpenSSH_5.1p1 Debian-6ubuntu2, OpenSSL 0.9.8g 19 Oct 2007 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug1: Connecting to yellow.example.com [126.96.36.199] port 22. debug1: Connection established. debug1: permanently_set_uid: 0/0 debug1: identity file /root/.ssh/identity type -1 debug1: identity file /root/.ssh/id_rsa type 1 debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-2048 debug1: Checking blacklist file /etc/ssh/blacklist.RSA-2048 debug1: identity file /root/.ssh/id_dsa type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.1p1 Debian-6ubuntu2 debug1: match: OpenSSH_5.1p1 Debian-6ubuntu2 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.1p1 Debian-6ubuntu2 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-cbc hmac-md5 none debug1: kex: client->server aes128-cbc hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Host 'yellow.example.com' is known and matches the RSA host key. debug1: Found key in /root/.ssh/known_hosts:9 debug1: ssh_rsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received 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: Trying private key: /root/.ssh/identity debug1: Offering public key: /root/.ssh/id_rsa debug1: Server accepts key: pkalg ssh-rsa blen 277 debug1: read PEM private key done: type RSA debug1: Authentication succeeded (publickey). debug1: Local connections to LOCALHOST:3142 forwarded to remote address 192.168.1.8:80 debug1: Local forwarding listening on ::1 port 3142. debug1: channel 0: new [port listener] debug1: Local forwarding listening on 127.0.0.1 port 3142. debug1: channel 1: new [port listener] debug1: channel 2: new [client-session] debug1: Requesting email@example.com debug1: Entering interactive session. debug1: Sending environment. debug1: Sending env LANG = en_GB.UTF-8 Linux yellow 2.6.31-17-server #54-Ubuntu SMP Thu Dec 10 18:06:56 UTC 2009 x86_64 To access official Ubuntu documentation, please visit: http://help.ubuntu.com/ System information as of Thu Feb 18 09:31:36 GMT 2010 System load: 0.0 Memory usage: 51% Processes: 96 Usage of /: 1.3% of 194.04GB Swap usage: 0% Users logged in: 0 Graph this data and manage this system at https://landscape.canonical.com/ 18 packages can be updated. 13 updates are security updates. Last login: Thu Feb 18 09:26:14 2010 from gate.example.com root@yellow:~# ~# The following connections are open: #2 client-session (t4 r0 i0/0 o0/0 fd 6/7 cfd -1) root@yellow:~# netstat -lntp | grep 3142 root@yellow:~#