This is similar to the effect you get with port forwarding or X11 forwarding, in which a PuTTY whose terminal session has already finished will still remain open so as to keep serving forwarded connections. The upstream PuTTY can therefore not terminate until all its downstreams have closed. All subsequent PuTTYs which reuse the connection are referred to as ‘downstreams’: they do not connect to the real server at all, but instead connect to the upstream PuTTY via local inter-process communication methods.įor this system to be activated, both the upstream and downstream instances of PuTTY must have the sharing option enabled.
When this mode is in use, the first PuTTY that connected to a given server becomes the ‘upstream’, which means that it is the one managing the real SSH connection. For example, selecting ‘Duplicate Session’ from the system menu will launch another session on the same host, and if sharing is enabled then it will reuse the existing SSH connection. Then, whenever you start up a PuTTY session connecting to a particular host, it will try to reuse an existing SSH connection if one is available. To enable this feature, just tick the box ‘Share SSH connections if possible’. The SSH-2 protocol permits you to run multiple data channels over the same SSH connection, so that you can log in just once (and do the expensive encryption setup just once) and then have more than one terminal window open.Įach instance of PuTTY can still run at most one terminal session, but using the controls in this box, you can configure PuTTY to check if another instance of itself has already connected to the target host, and if so, share that instance's SSH connection instead of starting a separate new one. The controls in this box allow you to configure PuTTY to reuse an existing SSH connection, where possible.
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