port forwarding problem

Hi all--

I cannot seem to get my webserver seen by the outside world. I've set
up a tomcat 6.0 webserver on port 8080 on my WinXP laptop. If I
browse http://localhost:8080, the tomcat init page pops up, no
problem. However, If I go to an external network on my mobile
cellphone and browse XXXX:8080, timeout occurs, no dice. I've checked
all the forums and have gone through what I see as the main culprits,
but to no avail.

To me, there are three steps the request has to take where it could be
breaking down:
1) from external webbrowser to my router
This works, because when I log into my work network and PING XXXX, my
host is alive and packets flow. Further proof: when I turn on my
"Surpress PING requests" on my modem, then this PING stops working.
Thus, it's pretty clear that XXXX is indeed my IP address, and that
the external world is able to reach my router. In fact, the IP
address given by both my modem's configuration and http://www.whatismyip.com/
agrees to XXXX and hasn't changed all day.

2) from router to my machine
I am using AT&T DSL, which gives me one dynamic IP address, connected
via a 2Wire modem that I've configured to do DMZ forwarding of all
requests to all ports to my laptop. However, I tried to run an
external port scan from my laptop on a public website, and none of the
ports ( including 8080 ) responded.

3) from my machine to tomcat
I've disabled any known firewalls: namely, the Windows XP firewall.
Also turned off all virusscan/security programs. Interestingly, when
I enable it, the firewall log does not register the external port scan
when I run that, perhaps further proof that step 2) is broken. Note
that when I browse my LAN IP address YYYY:8080, the tomcat init page
pops up, no problem.

To me, evidence points to step 2) being the breakdown. But more can I
do but do the DMZ forwarding? I restarted my machine as instructed
and verified the settings, no dice. I'm a novice networker, just
trying to get this thing up!

Thanks,

Isaac

Have you enabled port 8080 to go through your router firewall?

Yousuf Khan

zikester wrote:
> Hi all--
>
> I cannot seem to get my webserver seen by the outside world. I've set
> up a tomcat 6.0 webserver on port 8080 on my WinXP laptop. If I
> browse http://localhost:8080, the tomcat init page pops up, no
> problem. However, If I go to an external network on my mobile
> cellphone and browse XXXX:8080, timeout occurs, no dice. I've checked
> all the forums and have gone through what I see as the main culprits,
> but to no avail.
>
> To me, there are three steps the request has to take where it could be
> breaking down:
> 1) from external webbrowser to my router
> This works, because when I log into my work network and PING XXXX, my
> host is alive and packets flow. Further proof: when I turn on my
> "Surpress PING requests" on my modem, then this PING stops working.
> Thus, it's pretty clear that XXXX is indeed my IP address, and that
> the external world is able to reach my router. In fact, the IP
> address given by both my modem's configuration and http://www.whatismyip.com/
> agrees to XXXX and hasn't changed all day.
>
> 2) from router to my machine
> I am using AT&T DSL, which gives me one dynamic IP address, connected
> via a 2Wire modem that I've configured to do DMZ forwarding of all
> requests to all ports to my laptop. However, I tried to run an
> external port scan from my laptop on a public website, and none of the
> ports ( including 8080 ) responded.
>
> 3) from my machine to tomcat
> I've disabled any known firewalls: namely, the Windows XP firewall.
> Also turned off all virusscan/security programs. Interestingly, when
> I enable it, the firewall log does not register the external port scan
> when I run that, perhaps further proof that step 2) is broken. Note
> that when I browse my LAN IP address YYYY:8080, the tomcat init page
> pops up, no problem.
>
> To me, evidence points to step 2) being the breakdown. But more can I
> do but do the DMZ forwarding? I restarted my machine as instructed
> and verified the settings, no dice. I'm a novice networker, just
> trying to get this thing up!