Haihan Zhou July 2, 2010

Goddady’s Linux virtual host is used to provide SSH. However, when using SSH-D port XXX @server, I encountered the following error of SSH printing:

channel 3: open failed: administratively prohibited: open failed

When the Firefox browser is configured with SOCKS5 pointing to a local port, browsing any web page appears blank.
What is the reason for this?
SSH, open sSHd_config and have a look.

cat /etc/ssh/sshd_config

There was a row:

AllowTcpForwarding no

The original host set the TCP port forwarding for SSH to be disabled. That wants to use SSH as agent to carry out port forwarding is certainly unsuccessful.
Look at the system configuration again, also prohibit IP forwarding;

cat /etc/sysctl.conf | grep ip_forward
net.ipv4.ip_forward = 0

Therefore, the virtual host prompt port forwarding is prohibited, normal.