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From: Control Freq on 17 Apr 2008 10:12
Hi,
I know that ping failures is a frequent problem, and there is alot of
info available on how to troubleshoot this type of problem, but my
problem is subtley different from most.

I have two computers, (A) is an XP Pro Laptop, (B) is a Windows 2000
Server Desktop.

Both have static IP Address, (A) 192.168.1.10 and (B) is 192.168.1.11
Both have subnet masks of 255.255.255.0

(B) and (A) are networked together through a 3Com Hub. These are the
only two machines on the network. Quite simple.

Anyway, to the problem:

1) (B) cannot ping (A). At all.
2) (A) CAN ping (B), but after a few minutes the ping responses stop
with 'request timed out'.

There is no firewall running on either machine. I know that is bd
practice, but I am trying to solve this intermittent connection
problem.

So, what could be causing ping packets to be blocked from (B) to (A),
and what could cause pings from (A) to (B) to run for a while, before
getting 'request timed out'.

Any suggestions appreciated.

Regards
From: Lem on 17 Apr 2008 13:40
Control Freq wrote:
> Hi,
> I know that ping failures is a frequent problem, and there is alot of
> info available on how to troubleshoot this type of problem, but my
> problem is subtley different from most.
>
> I have two computers, (A) is an XP Pro Laptop, (B) is a Windows 2000
> Server Desktop.
>
> Both have static IP Address, (A) 192.168.1.10 and (B) is 192.168.1.11
> Both have subnet masks of 255.255.255.0
>
> (B) and (A) are networked together through a 3Com Hub. These are the
> only two machines on the network. Quite simple.
>
> Anyway, to the problem:
>
> 1) (B) cannot ping (A). At all.
> 2) (A) CAN ping (B), but after a few minutes the ping responses stop
> with 'request timed out'.
>
> There is no firewall running on either machine. I know that is bd
> practice, but I am trying to solve this intermittent connection
> problem.
>
> So, what could be causing ping packets to be blocked from (B) to (A),
> and what could cause pings from (A) to (B) to run for a while, before
> getting 'request timed out'.
>
> Any suggestions appreciated.
>
> Regards

Bad hub?

Check Task Manager on both computers, particularly A, to identify
everything that's running. You may have a firewall (or an antivirus
application behaving like a firewall). Also note that Nvidia network
adapters (either PCI or motherboard) may include a firewall that you're
not aware of:
http://networking.nitecruzr.net/2006/02/hidden-personal-firewall-nvidia-nforce.html

--
Lem -- MS-MVP

To the moon and back with 2K words of RAM and 36K words of ROM.
http://en.wikipedia.org/wiki/Apollo_Guidance_Computer
http://history.nasa.gov/afj/compessay.htm
From: AJR on 17 Apr 2008 14:37
Regarding "... (A) CAN ping (B...." - not true - B is not responding.

Couple of thoughts - TCP port 445 must be opened - ICMP setting "Allow
incoming echo requests" must be checked.

Also you do not state whether or not the network functions OK and regarding
" I am trying to solve this intermittent connection..." - how are you
applying "intermittent".





"Control Freq" <nick(a)nhthomas.freeserve.co.uk> wrote in message
news:6d313415-b3ce-4384-97af-fa7bfd945146(a)m44g2000hsc.googlegroups.com...
> Hi,
> I know that ping failures is a frequent problem, and there is alot of
> info available on how to troubleshoot this type of problem, but my
> problem is subtley different from most.
>
> I have two computers, (A) is an XP Pro Laptop, (B) is a Windows 2000
> Server Desktop.
>
> Both have static IP Address, (A) 192.168.1.10 and (B) is 192.168.1.11
> Both have subnet masks of 255.255.255.0
>
> (B) and (A) are networked together through a 3Com Hub. These are the
> only two machines on the network. Quite simple.
>
> Anyway, to the problem:
>
> 1) (B) cannot ping (A). At all.
> 2) (A) CAN ping (B), but after a few minutes the ping responses stop
> with 'request timed out'.
>
> There is no firewall running on either machine. I know that is bd
> practice, but I am trying to solve this intermittent connection
> problem.
>
> So, what could be causing ping packets to be blocked from (B) to (A),
> and what could cause pings from (A) to (B) to run for a while, before
> getting 'request timed out'.
>
> Any suggestions appreciated.
>
> Regards


From: Jack (MVP-Networking). on 17 Apr 2008 20:13
Hi
Are these two computers connected to the Internet (if yes how)?
Jack (MVP-Networking).

"Control Freq" <nick(a)nhthomas.freeserve.co.uk> wrote in message
news:6d313415-b3ce-4384-97af-fa7bfd945146(a)m44g2000hsc.googlegroups.com...
> Hi,
> I know that ping failures is a frequent problem, and there is alot of
> info available on how to troubleshoot this type of problem, but my
> problem is subtley different from most.
>
> I have two computers, (A) is an XP Pro Laptop, (B) is a Windows 2000
> Server Desktop.
>
> Both have static IP Address, (A) 192.168.1.10 and (B) is 192.168.1.11
> Both have subnet masks of 255.255.255.0
>
> (B) and (A) are networked together through a 3Com Hub. These are the
> only two machines on the network. Quite simple.
>
> Anyway, to the problem:
>
> 1) (B) cannot ping (A). At all.
> 2) (A) CAN ping (B), but after a few minutes the ping responses stop
> with 'request timed out'.
>
> There is no firewall running on either machine. I know that is bd
> practice, but I am trying to solve this intermittent connection
> problem.
>
> So, what could be causing ping packets to be blocked from (B) to (A),
> and what could cause pings from (A) to (B) to run for a while, before
> getting 'request timed out'.
>
> Any suggestions appreciated.
>
> Regards

From: Control Freq on 18 Apr 2008 06:43

Wow, some great responses thanks.

To address the points made by all respondents:

1) I have tried another HUB, and also replced it with a cheap Pluscom
switch. Still getting the same problems, so I think that rules out the
hub/switch.
I also replaced all CAT 5 cables, still no joy.

2) I checked firewalls. The XP Pro Laptop has the firewall switched
off, for the purposes of this test.
I cannot find a firewall icon on the Windows 200 Server Control Panel.
And I don't think that a third party firewall was installed. But I
will check this.

3) Firewall in the network card. I have never heard of this, but it is
worth investigating. The network card in the server is an Intel ProSet
III. I will check.

4) These computers are not connected to internet. Just a small local
network. There is just these two computers, and a hub/switch. Thats
it.


The problem I am seeing is an intermittent loss of ping responses.

Problems
1) (B) (Win 2K Server) cannot ping (A) (XP Pro Laptop) at all.
2) (A) can ping (B) some of the time.
On (A) I start a ping command like 'ping -t 192.168.1.11' and leave
that running.
I now see regular good responses from (B). So far so good.

Now, I make a cup of coffee, and keep watching the ping responses.
After a while (maybe 10 to 15 minutes) the ping responses will get
'request timed out'.
There is nothing else I am doing (other than drinking my coffee).
I will see a few minutes of 'request timed out'.
I continue to stand there, scratching my head, and all of a sudden,
the good ping responses might come back.

This is definately weird. After a few more minutes, the ping responses
will go back to 'request timed out' and then if I leave it running a
while longer, they might turn back into good responses.

I defaintely need some help here. It's as if the system is haunted.


Any more ideas?
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