The TurboVNC Viewer normally makes an outbound connection to the VNC
server, but it can optionally be started in "Listen Mode", in which case
the server would make an inbound ("reverse") connection to the viewer.
vncconnect is executed on the server machine and used to initiate a
reverse connection from a TurboVNC Server instance to a listening viewer
on the client machine. As far as firewalls, the problem with Listen
Mode is that you have to open up a port (usually 5500) on the client
machine (there is no way to tunnel a reverse connection over SSH), so
that may be less desirable than opening up a range of ports on the
server, depending on the specifics of your compute environment. When
using the TurboVNC Server with normal (forward) connections, you
generally only need to open up ports 5900-5999 on the server, unless
you're planning to have more than 100 simultaneous sessions. Also,
since forward connections can be tunneled through SSH, you don't
actually need to open up server ports at all if you're using SSH tunneling.
The Listen Mode/reverse connections feature is mainly useful in batch
queuing/job scheduling environments. For instance, if you were starting
a TurboVNC Server instance on a cluster using a job scheduler and didn't
know which cluster node it would actually run on, you could instruct the
job scheduler to run vncconnect to initiate a reverse connection from
the cluster node back to your client.
DRC
On 1/9/18 9:20 AM, g1patnaik wrote:
> Hi,
>
> I do not understand the purpose of vncconnect and when it will be useful.
>
> What I understand is that the vncviewer port can be a defined port and
> hence, the client ports can be in a port range we define and thus we can
> have more restricted/strict firewall rules. Is that it?
>
> Thanks!
>
> Regards,
> Jeevan,
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