Cannot connect to a specific remote port

[Netty-]

From my computer (Win XP SP2) I cannot connect to a server within the network
(port 6002). Other ports that are open on that server work just fine.

With the same IP settings (including gateway, excluding hostname) copied on
a laptop, using the same cable, it is possible to connect to it. Other
systems within the network (2 more) do not have this issue and are supposed
to be based on the same harddisk image.

Port filtering was switched on, but is now switched off to exclude the
possibilty (and of course rebooted).

Is there any other way of internally blocking access to a remote port? No
firewalls present and to test the connection I use a telnet session on this
port (which usually works fine).
Any other checks I can do? Currently I am trying portqry.

 

[smlunatick]

From my computer (Win XP SP2) I cannot connect to a server within the network
(port 6002). Other ports that are open on that server work just fine.

With the same IP settings (including gateway, excluding hostname) copied on
a laptop, using the same cable, it is possible to connect to it. Other
systems within the network (2 more) do not have this issue and are supposed
to be based on the same harddisk image.

Port filtering was switched on, but is now switched off to exclude the
possibilty (and of course rebooted).

Is there any other way of internally blocking access to a remote port? No
firewalls present and to test the connection I use a telnet session on this
port (which usually works fine).
Any other checks I can do? Currently I am trying portqry.

Anti-virus software can block access.
Out-going PC (the one starting the remote connection) can have a
firewall software blocking the access.

 

[Jack \(MVP-Networking\).]

Hi
The ports on any computer are Not blocked by default they are just sitting
there ready to be used.
In order to block a port you need an application that is specifically design
for it()one of the function of software Firewall is to block ports).
I.a if a port is blocked on a computer there is an application that blocks
it. I can not guess which one is doing it on your computer, you will have to
find it and open the port through the application.
Windows Native Firewall setting for Sharing XP -
http://support.microsoft.com/kb/875357
Jack (MS, MVP-Networking)

 

[Netty-]

Yes, I did some programming myself, so I know enough about creating sockets,
listening ports etc. My first problem is that this network is located some
8000 miles away from me, so I can not look into it either. Current plan is to
reinstall the whole OS-image again. A bit of a blund axe, but I at least know
this image works and no-one fiddled with the settings.

Thanks for your reply anyway!

 

[John Wunderlich]

Yes, I did some programming myself, so I know enough about
creating sockets, listening ports etc. My first problem is that
this network is located some 8000 miles away from me, so I can not
look into it either. Current plan is to reinstall the whole
OS-image again. A bit of a blund axe, but I at least know this
image works and no-one fiddled with the settings.

Thanks for your reply anyway!

Occasionally, LSPfix can repair problems like this that affect only
certain ports. Free program. Might be worth a try...

<http://www.cexx.org/lspfix.htm>

HTH,
John

 

[Netty-]

Thanks! I will give it a go!

Occasionally, LSPfix can repair problems like this that affect only
certain ports. Free program. Might be worth a try...

<http://www.cexx.org/lspfix.htm>

HTH,
John

 

[Netty-]

We finally 'solved' this issue by replacing the hard drives (RAID) with 2 new
ones. Something was corrupt in windows, but I guess we will never know what
it was...

 

[John Wunderlich]

We finally 'solved' this issue by replacing the hard drives (RAID)
with 2 new ones. Something was corrupt in windows, but I guess we
will never know what it was...

Sometimes the elephant gun approach is the quickest and most reliable
way of solving such problems.

Thanks for the feedback.
-- John