Accessing a server behind a firewall

[Peter Ball]

On 11 Apr 2000, at 16:37, Chowdry, Mamoon wrote:

> I'm writing to both help others who may want to do the what I am 
> doing and also to ask if there's a more elegant solution. I have
> been trying to access my office PC (which is behind a firewall),
> from a PC on the internet. 
> 
> My current solution is:
> My office PC has a VNC server running as a service. Every 
> hour I have a scheduled task that runs "winvnc -connect
> <HOME_IP_ADDRESS>". On my home PC I have the VNC
> client running in listen mode.
> 
> This is the only way I can "dial in" to the office as the firewall 
> only allows outgoing TCP connections.
> 
<snip>
> Is there anyway I can trigger the server PC to initiate a VNC 
> session on demand, instead of on a regular basis?

It's just an idea but assuming your mail server runs 24/7 one thing 
that can get through to your PC from outside the firewall is an 
email. An email client that's programable could POP your mail 
sever just for the sender and subject looking say once a minute 
looking for an email from you with a particular subject line then run 
the command "winvnc -connect <HOME_IP_ADDRESS>".

I've not done this,  as I said it just an idea :-)

Best Wishes








-----------------------------------
Peter Ball
Computers For Linguists
cfl "at" marguet-ball.demon.co.uk
Tel: +44(0)20 7732 1741
Fax: +44(0)20 7358 9214
45 Endwell Road, London, SE4 2PQ, United Kingdom
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