Re: Open Ports
From: sharad (sharad_at_anonymous.com)
Date: 02/04/04
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Date: Wed, 4 Feb 2004 16:53:23 +0530
Do you have a mail server on your server?
If not then get the free version from www.argosoft.com and install it.
Change the SMTP port of the mail server, from default 25, to 500, then from
internet telent to your server by its ip address followed by space followed
by 500
(e.g. telnet 64.91.10.101 500)
If it gets connected and says Welcome to xyz mail server
then port 500 is correctly enabled and can be opened
when requested.
Repeat above by changing the SMTP port of the mail server to other ports you
want to check.
Sharad
"Mickey" <anonymous@discussions.microsoft.com> wrote in message
news:91f701c3ea29$89d14d60$a501280a@phx.gbl...
> Thank you, Sharad, for your quick response. I very much
> appreciate that. Now I understand...
>
> Is there a utility to test requesting to open a port
> through the internet? The reason I am asking is that I am
> trying to connect to my company's VPN server using AT&T 's
> VPN network client from home's NATed environment. I keep
> getting a IPSEC error...
>
> AT&T requested certain open ports. My problem is that any
> client behind the NAT server are not able to connect to a
> VPN server across the internet. If I bypass the NAT, it is
> working fine. I got an 'IPSEC communication error...'
> AT&T stated that they are using l2tp and that I need to
> open those ports: UDP 500, TCP 50, 5080, 379... on the NAT
> Server/Router. Since I am using broadband connection,
> IPSEC drivers are needed and loaded by the AT&T client
> software at the client workstation to initiate the
> tunneling. But for some reason, the tuneneling can't be
> established through the NAT. Any suggestions?
>
> Thanks again for your assistance.
>
> >-----Original Message-----
> >What you did is, gave access to the port from internet.
> >You are asked open ports for connecting through internet,
> which most
> >propably means, "Do not
> >block them, give access to them."
> >
> >It is not required to keep the port actually open.
> >
> >So you have given access now, through NAT. Now
> >a process should make a request to open the port, then
> >it will communicate, after it is done the port will be
> closed again.
> >Sharad
> >
> >"Mickey" <anonymous@discussions.microsoft.com> wrote in
> message
> >news:8eed01c3ea1e$c3ddb030$a001280a@phx.gbl...
> >> Thank you, guys, for the input. I tried Service and
> Ports
> >> setup in IP Routing. I used the same ports for both
> >> incoming and outgoing (such as 1731) and put in the
> >> internal private IP. But when I do a port scan from a
> web
> >> port scan tool site, it still shows that the port is not
> >> open. Did I do something wrong? When I scan other port
> >> like 1720, it shows that the port is open. Please help!
> >> Thanks!
> >>
> >> >-----Original Message-----
> >> >Start - Administrative Tools->Routing and Remote
> Access.
> >> >
> >> >When it opens, expand "IP Routing" and under it
> >> >find NAT/Firewall and click on it. On the right side
> then
> >> >you will find the adapters listed. Right click on the
> >> adapter which is used
> >> >for internect connection, and
> >> >select properties.
> >> >When the property window opens click on Service and
> >> Ports Tab.
> >> >There is already a list of standard ports which are
> most
> >> >commonly used, and these can be opened by checking the
> >> coresspoinding check
> >> >box. If the required port is not in the common list,
> you
> >> can click on "Add"
> >> >give a description you like, and enter the required
> >> incoming and outgoing
> >> >port.
> >> >Sharad
> >> >"Mickey" <anonymous@discussions.microsoft.com> wrote in
> >> message
> >> >news:6dff01c3e6ad$c3bb7980$a501280a@phx.gbl...
> >> >> I am using Windows Server 2003 NAT and am requested
> to
> >> >> open certain ports for a software to connect over the
> >> >> Internet. I wonder if someone could tell me how to
> open
> >> >> and/or close certain ports in Windows Server 2003 and
> >> how
> >> >> to configure port forwarding in NAT. Also, is there a
> >> tool
> >> >> to list all open or closed ports?
> >> >>
> >> >> Thank you very much in advance!
> >> >
> >> >
> >> >.
> >> >
> >
> >
> >.
> >
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