Re: Controlling Outbound Ports
- From: Baboon <baboon@xxxxxxxxxxxxxx>
- Date: Mon, 1 Oct 2007 13:13:00 -0700
Thanks for the reply.
I really am just looking for a utility that might possibly exist to
troubleshoot this, but here's more info, though it's kind of beside the point:
I was referring to the ports that the client uses to connect to port 80 on
the server. Those ports on Windows XP, 2003, 2000 are typically something
like the range you refer to. On OSX and Vista, they are more like in the
49000 range or greater. Run netstat on all of those OSes and you will see
what I mean. Most likely that is why we are only having problems on XP to
this one site, for what ever reason.
Yes of course the client sets up these ports and if the connection is
successful, it receives packets back from the web server on those same ports.
Possibly something along the path is blocking the return packets based on
the port range and our network address, we don't know.
This doesn't affect just IE, also Firefox. Most importantly, I sat at an XP
machine and tried to access the website but couldn't. I then made a VPN
connection to another network from the same machine and was able to connect
to the site. I also did the opposite; I connected from home to the website
successfully, then made a VPN connection to our network and couldn't access
the site.
This problem clearly happens only from our network and only from XP
machines. Since it appears the lower port range used by XP along with some
other factor is what's causing the problem, we are being asked to try and
make a connection to port 80 on their web server using a higher client port
than what is typically used on XP, in order to confirm that it is in fact the
lower port range that makes the difference. This is why I need a utility
that allows me to control the client ports that can be used, at least for
testing.
"Phillip Windell" wrote:
"Baboon" <baboon@xxxxxxxxxxxxxx> wrote in message.
news:1E57805F-89F1-4CCB-8806-766E19EE5CF5@xxxxxxxxxxxxxxxx
Is there some way, most likely via some utility, to control the outbound
ports that are used to make a TCP connection for testing? I would like to
be
able to do something like "localhost 53200 -> www.somewebsite.com -> 80".
We are having a problem where only XP and 2003 machines from our network
are
unable to access a particular website. Vista and Macs do not have the
problem. We have noticed that the latter 2 operating systems use much
higher
ephemeral ports than XP or 2003, so we suspect that the outbound ports are
being blocked somewhere beyond our firewall, but we need something more
conclusive.
If this is a website then the outbound port is 80 unless otherwise
specified.
The Client Source Port is a random number usually, but not always, between
2500-5000. The Client Source Port is established by the Client and not the
"target", and therefore if this port was the problem the Client machine
would not get to any site at all, you would not simply see this with only
certain sites.
Most likely there is something in the Code of the pages of the Site that
isn't reacting well with the Version of IE on the XP/2003 machines. If the
Site uses Java (Java Applets, not simply JavaScript) the the version of the
JRE could matter as well and the version of the JRE is probably different on
Vista and certainly different on the MAC.
--
Phillip Windell
www.wandtv.com
The views expressed, are my own and not those of my employer, or Microsoft,
or anyone else associated with me, including my cats.
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