I have been researching for hours and still unable to solve my problem.
This error "ssh_exchange_identification: Connection closed by remote host" has many proposed solutions but none seem to solve my problem.
This is what I want to accomplish:
I have a server (10.0.0.5) SSH on it. The server has the following users and their shells:
passport , shell=/bin/false user1, shell=git-shell user2, shell=git-shell me, shell=bash
The sshd_config file, has the following entry at the end:
AllowTcpForwarding no Match User passport,user1,user2 AllowTcpForwarding true PermitOpen 10.0.0.5:8080 PermitOpen 10.0.0.5:22
I also enabled public key authentication. The goal is to disable all tcp forwarding from SSH and only allow the users mentioned above to have forwarding on two ports:
- SSH - a web server
In my /etc/hosts.allow and .deny files there are no entries.
I setup the appropriate authorized_keys file (just the ssh-rsa ...) in /home/passport/.ssh/authorized_keys
From a Windows machine, try to ssh:
ssh email@example.com -N -L 22:10.0.0.5:22 -L 8080:10.0.0.5:8080
This works fine, when "I try to surf to
This means my port forwarding works fine.
Now, I want to try to SSH through that tunnel and use 'user1':
ssh -N firstname.lastname@example.org
At this moment, I get:
ssh_exchange_identification: Connection closed by remote host
Whereas, if I just SSH directly from my Windows machine, I succeed:
ssh -N email@example.com
I don't know why it does not work.
I inspect /var/log/auth.log and observe:
Feb 4 10:28:23 myhost sshd: debug1: server_input_channel_open: ctype direct-tcpip rchan 257 win 16384 max 16384 Feb 4 10:28:23 myhost sshd: debug1: server_request_direct_tcpip: originator 0.0.0.0 port 0, target 10.0.0.5 port 22 Feb 4 10:28:23 myhost sshd: Received request to connect to host 10.0.0.5 port 22, but the request was denied. Feb 4 10:28:23 myhost sshd: debug1: server_input_channel_open: failure direct-tcpip
I try to flush the iptable with -F and try restarting sshd, but still I get a connection closed error.
Why can't I ssh via the tunnel?
The reason I created "passport" user is to allow users to remotely login to my network. They will be able to use the web server.
Now if they want to use GIT, they will use the following for example:
git clone ssh://firstname.lastname@example.org/repos/repo.git
I am running Debian 6, with Linux 2.6.32 and OpenSSH 5.5p1
Please advise on how to solve my problem. I tried all of the solutions listed for the question with the same title as my question but to no avail!