проблема переадресации порта ssh

Я хочу использовать переадресацию портов ssh. Я не использовал эту функцию в течение нескольких лет, поэтому, возможно, я забыл что-то очевидное, или настройки ОС по умолчанию могли измениться.

Я пробовал это на трех разных машинах (все с Ubuntu 9.10). Отладка говорит, что открывает порты для прослушивания. Они должны уйти немедленно и молча.

Я проверил, могу ли я подключиться к 192.168.1.8:80 с моей локальной машины.

Вероятно, есть очень простая причина, но я не нашел ее за 20 минут поиска в Google.

Есть идеи, в чем может быть проблема?

Спасибо,

Крис.

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 [199.82.114.103] 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 no-more-sessions@openssh.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:~#