I Need help in working vnc viewer or java vnc viewer behind a proxy/firewall.

[Pablo J Royo]

I4m not sure if the "host unreachable" error is due to this, but I think
your proxy is not configured to enable outgoing connections on "non
standard" ports as 5900,5800.
By default, proxys get installed with support for outgoing connections on
443,80,563 ports and all other ports must be configured by hand, due to
security reasons.
 I checked this with MS ProxyServer2 some time ago, and I suppose ISA server
will be the same. The option to enable other ports was hidden and I don't
remember exactly...so you can run your VNCServer on 80 or 443 port so you
don4t have to search for it.

Hope this helps.

----- Original Message -----
From: "Fadi Kahhaleh" <kahhaleh "at" gmail.com>
To: <vnc-list "at" realvnc.com>
Sent: Monday, September 27, 2004 8:21 AM
Subject: I Need help in working vnc viewer or java vnc viewer behind a
proxy/firewall.


> Hi everyone,
>
> I am soooo frustraited from this, because I've spent a lot of hours trying
to
> fix my problem with no luck.
>
> My pc is connected to the world wide web 24/7 via adsl.
> I have configured the firewall to accept and forward incomming connections
> on 5900 and 5800 to my pc where vnc server is running.
>
> I have tested my settings from my friend's house by connecting to my PC
> from there, and it was great. the vnc is just fabilous.
>
> My problem is connecting from a place where a proxy is defined in the
> internet explorer's settings.
> I am not sure if a firewall do exist also, but what i am sure of is that
> there is a proxy as my settings point to it. and its an ISA proxy.
> (socks field is empty, not configured to access the proxy).
>
> typically using vnc viewer standalone .exe will not work as it will
> never be able
> to reach the host, since for example pinging it returns "Host
unreachable".
>
> But to my surprise, that vnc viewer (java) was able to access my PC and
get
> the vnc page and start the java connection dialog. then i click OK to
> connect and i get
> the following error:
> java.net.NoRoute.ToHostException: Host unreachable
>
> What in God's name is happning, shouldn't this be working normally...i
> mean thats
> the whole point of using a java/webbased vnc rather than a tcp/ip
> socks oriented connection :s....
>
> Thanks for all the help,
>
> F.K
>
> (note, i connect using web IE 6, http://someserver.com:5800 !!)
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