[EdLUG] [edlug] Unable to connect to webserver behind router

[Edinburgh Linux Users Group]

Only thing I can think of is the data logger hasn't got the correct 
gateway address on it.
If you can connect locally from the server to it, then it is local lan, 
via the net it is through a gateway.

On 06/01/15 12:20, Edinburgh Linux Users Group wrote:
> Hi all, Happy new year!
> I wonder if anyone can suggest where to look for clues as to why I 
> can't connect to a webserver behind an ADSL router?
>
> The device is a small data logging (weather) device that's runing a 
> web server on port 80 (this can't be changed).  On the same network I 
> have a small LAMP server and an IP camera.  I can successfully 
> port-forward to both of these but not the data logger.  The tech 
> support for the data logger manufacturers told me that since the LAMP 
> server is listening on port 80 then it will clash with the data 
> logger!  This is of course nonsense.  I can connect to the data logger 
> just fine locally.
>
> However, just to indulge the support guys I have tried shutting down 
> apache on the LAMP server and changing the IP camera’s port to 81. 
> Still no joy.
>
> I have from the beginning, been able to connect to the logger just 
> fine by setting up an ssh tunnel into it via the LAMP server.
>
> I ran tcpdump on the server and captured traffic on port 80 going to 
> the logger both directly (via port forwarding to the device) and also 
> via the tunnel.
>
> This is where I'm now stumped :(
>
> Anyone got any ideas please?
>
> Many thanks,
>
> Norrie
> -
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