the one in the middle) enabled it so I could SSH all the way through. Kex_exchange_identification: Connection closed by remote hostīut adding them and bouncing the SSHD on the "proxy" server (i.e. Without these settings I'd get the following error: $ channel 0: open failed: administratively prohibited: open failed When using a ProxyJump configuration the server in between, needed to have the configuration options enabled on its /etc/ssh/sshd_config file, mainly: $ more /etc/ssh/sshd_config In my scenario I had the following in my client's SSH ~/.ssh/config. │ SSH Client ├────►│ ProxyJump Server ├─────►│ SSH Server │ I was trying to do the following type of SSH connection using a ProxyJump. I just wanted to confirm what mentioned in their answer. Then, restart your sshd server service ssh /etc/init.d/ssh restart To avoid this kind of error, have a look at the SSH daemon configuration file :Īdd possibly the following line echo “PermitTunnel yes” > /etc/ssh/sshd_config While trying to do some SSH tunneling, here is the error I got :Ĭhannel 3: open failed: administratively prohibited: open failed But making this change got rid of the failed message In my case i'd done ssh -ND *:1234 and when I connected a browser to that comp-socks server, it browsed, but on the comp where I ran that ssh command I got that error appearing at the console with each request - for one site at least, though the browser retrieved it through the proxy or seemed to, at least to the extent that I saw the main age. I saw this error on cygwin and this should be true of linux too and worked for me. What I understand here is that administratively means "due to a specific configuration on server side". It seems that SSH does not understand that localhost is a shortcut to 127.0.0.1, hence the message in auth.log and the administratively prohibited message. In my ~/.ssh/authorized_keys (remote side) I had this: command="/home/user/tunnel",no-X11-forwarding,no-pty,permitopen="localhost:10000",permitopen="localhost:10001" ssh-rsa AAAA. My /var/log/auth.log contained: Received request to connect to host 127.0.0.1 port 10001, but the request was denied. This gave me a similar problem with monitoring port: autossh -M 10001 -o GatewayPorts=yes -o ServerAliveInterval=60 -o TCPKeepAlive=yes -T -N -R :10000:localhost:22 -i ~/.ssh/id_rsa had that message (after 10 minutes): channel 2: open failed: administratively prohibited: open failed I had the same problem using ~/.ssh/authorized_keys with permitopen.Īs I use autossh to create a tunnel, I need two ports:
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