Re: How to test newly opened port?

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From: Jack Peacock (peacock_at_simconv.com)
Date: 08/27/04 

Date: Fri, 27 Aug 2004 15:35:06 -0700

"Steve" <as@joe.ca> wrote in message
news:u8f$fiGjEHA.3712@TK2MSFTNGP15.phx.gbl...
> Hi,
>
> I have an alarm system device that can send data to an alarm central thru
> Internet. This device is connected to the hub and has its own IP address.
> The vendor told me that I have to open UDP port xxxxxx to allow the device
> signal to go to a Web central server. I opened a UDP port but how can I
> check if this port is really open without contacting the central? I ran
> AATools but I'm not sure about the result and currently, the central says
> that they don't get any signal.
>
Is the web server on the same physical machine as the ISA server? If not
then you have to enter a server publishing rule to direct the traffic on the
UDP port to the server behind the firewall. If it is on the same server
then you have to enter packet filters.

Can you ping the ISA server from the remote site, and from ISA to the remote
site (or at least the routers)? You have an additional problem in how the
remote site knows which IP address to use if your ISA server has a dynamic
internet IP. A ping will tell you if a path exists based on your routing
tables.
  Jack Pea***

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