However, Plink's built-in -nc option does not depend on the nc program being installed on the server. The command ‘ plink host1 -nc host2:port’ is very similar in functionality to ‘ plink host1 nc host2 port’, which invokes nc on the server and tells it to connect to the specified destination. (The option is named -nc after the Unix program nc, short for ‘netcat’. Also, -nc uses the same server functionality as port forwarding, so it will not work if your server administrator has disabled port forwarding. It is available in PuTTY itself, although it is unlikely to be very useful in any tool other than Plink. It is not available in the file transfer tools PSCP and PSFTP. This feature is only available in SSH protocol version 2 (since the version 1 protocol assumes you will always want to run a shell). In this situation you might select ‘Local’ proxy type, set your local proxy command to be ‘ plink %proxyhost -nc %host:%port’, enter the target host name on the Session panel, and enter the directly reachable proxy host name on the Proxy panel. In the Proxy tab sheet, you need to fill in the following information: Select the proxy type: Local Give the name of the proxy server'. In PuTTY, go first to the \Proxy' category (under \Connection'). See the instructions on our Using Pageant page. You might want to use this feature if you needed to make an SSH connection to a target host which you can only reach by going through a proxy host, and rather than using port forwarding you prefer to use the local proxy feature (see section 4.15.1 for more about local proxies). First you need to start up pageant and load your private key into it. You specify a host and port as an argument to the -nc option, with a colon separating the host name from the port number, like this: Instead, it will instruct the remote server to open a network connection to a host name and port number specified by you, and treat that network connection as if it were the main session.
The -nc option prevents Plink (or PuTTY) from attempting to start a shell or command on the remote server. Previous page next page 3.8.3.14 -nc: make a remote network connection in place of a remote shell or command
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