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From: computer_ceo on 13 Oct 2005 09:33
For anyone having problems with network cable unplugged error messages
you might want to try changing the data transmission speed on the
Ethernet card. Here is some info I found useful:

It has been verified by experiment that certain auto-negotiating
ethernet cards (both in PCs and in Macs), when connected to certain
models of cable modem, sense the ethernet duplex setting incorrectly.
Such a cable modem has ethernet hardware which is capable of operating
only in half-duplex mode, at 10 Mbps, yet some auto-negotiating
ethernet cards incorrectly sense the cable modem as full-duplex. If an
auto-negotiation card incorrectly starts operating in full-duplex mode,
there can be collisions between ethernet packets being transmitted in
both directions at the same time, leading to packet loss, and repeated
re-transmissions. There is no visible evidence of this apart from poor
performance. This problem can be avoided by manually configuring your
ethernet card to be 10 Mbps half-duplex. No ill-effects will transpire
from doing this, even when it is not necessary. The exact wording of
the setting changes required varies from one manufacturer to another,
so the instructions below are necessarily rather broadly defined.

Win98/ME: to change to half-duplex:

Open Control Panel.
Double-click Network.
>From the scrollable list, select your Ethernet adapter (rather than any
dial-up) with a green icon.
Click the button Properties.
Click the tab Advanced to bring it to the front:
In the Property box, the property name to be selected varies according
to model of ethernet card. Examples are: Network Link Selection, Media
Type, Connection Type, Duplex Mode, or any similarly-named property
which can have Values looking like Auto-Negotiation, or 10BT, or
10BaseT.
In the Value box, select a value which either (a) explicitly says
half-duplex or semi-duplex, or (b) at least does not say full-duplex
[e.g. 10BaseT on its own is OK]. If there is a choice between 10 and
100 with half-duplex, choose the 10. Do not choose 10Base5, 10Base2, or
AUI.
Click OK to exit the Adapter settings.
Click OK all the way out - you might need to restart.
Windows 2000 or XP: to change to half-duplex:

Open Control Panel.
Double-click Network and Dial-up Connections.
Identify the icon for your cable modem connection: usually Local Area
Connection.
Right-click that icon and select Properties.
Under the ethernet adapter icon, click the button Configure.
Click the tab Advanced to bring it to the front:
In the Property box, the property name to be selected varies according
to model of ethernet card. Examples are: Network Link Selection, Media
Type, Connection Type, Duplex Mode, or any similarly-named property
which can have Values looking like Auto-Negotiation, or 10BT, or
10BaseT.
In the Value box, select a value which either (a) explicitly says
half-duplex or semi-duplex, or (b) at least does not say full-duplex
[e.g. 10BaseT on its own is OK]. If there is a choice between 10 and
100 with half-duplex, choose the 10. Do not choose 10Base5, 10Base2, or
AUI.
Click OK to exit the Adapter settings.
Click OK to exit the Connection properties.

From: Robert L [MS-MVP] on 13 Oct 2005 10:00
This troubleshooting may help,

Network errors
Network Cable unplugged The network request is not supported. TCP/IP network
transport not installed. The network request is not supported. Symptoms: 1. ...
www.chicagotech.net/networkerrors.htm

Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
"lim_eric" <limeric(a)discussions.microsoft.com> wrote in message news:F845E642-3A33-462D-92B4-FFA31E6E3E67(a)microsoft.com...
Whenever I start my computer, the local area connection icon will be shown
with a red cross and it reads that a network cable is unplugged. I checked
the network connection properties, I am connected using Realtek RTL8139
Family PCI Fast Ethernet NIC. The driver is working properly but what is the
problem with the connection?
From: Robert L [MS-MVP] on 13 Oct 2005 10:01
Thank you for sharing your experience with us.

Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
"computer_ceo" <kingofkings777(a)yahoo.com> wrote in message news:1129210382.887221.84020(a)z14g2000cwz.googlegroups.com...
For anyone having problems with network cable unplugged error messages
you might want to try changing the data transmission speed on the
Ethernet card. Here is some info I found useful:

It has been verified by experiment that certain auto-negotiating
ethernet cards (both in PCs and in Macs), when connected to certain
models of cable modem, sense the ethernet duplex setting incorrectly.
Such a cable modem has ethernet hardware which is capable of operating
only in half-duplex mode, at 10 Mbps, yet some auto-negotiating
ethernet cards incorrectly sense the cable modem as full-duplex. If an
auto-negotiation card incorrectly starts operating in full-duplex mode,
there can be collisions between ethernet packets being transmitted in
both directions at the same time, leading to packet loss, and repeated
re-transmissions. There is no visible evidence of this apart from poor
performance. This problem can be avoided by manually configuring your
ethernet card to be 10 Mbps half-duplex. No ill-effects will transpire
from doing this, even when it is not necessary. The exact wording of
the setting changes required varies from one manufacturer to another,
so the instructions below are necessarily rather broadly defined.

Win98/ME: to change to half-duplex:

Open Control Panel.
Double-click Network.
>From the scrollable list, select your Ethernet adapter (rather than any
dial-up) with a green icon.
Click the button Properties.
Click the tab Advanced to bring it to the front:
In the Property box, the property name to be selected varies according
to model of ethernet card. Examples are: Network Link Selection, Media
Type, Connection Type, Duplex Mode, or any similarly-named property
which can have Values looking like Auto-Negotiation, or 10BT, or
10BaseT.
In the Value box, select a value which either (a) explicitly says
half-duplex or semi-duplex, or (b) at least does not say full-duplex
[e.g. 10BaseT on its own is OK]. If there is a choice between 10 and
100 with half-duplex, choose the 10. Do not choose 10Base5, 10Base2, or
AUI.
Click OK to exit the Adapter settings.
Click OK all the way out - you might need to restart.
Windows 2000 or XP: to change to half-duplex:

Open Control Panel.
Double-click Network and Dial-up Connections.
Identify the icon for your cable modem connection: usually Local Area
Connection.
Right-click that icon and select Properties.
Under the ethernet adapter icon, click the button Configure.
Click the tab Advanced to bring it to the front:
In the Property box, the property name to be selected varies according
to model of ethernet card. Examples are: Network Link Selection, Media
Type, Connection Type, Duplex Mode, or any similarly-named property
which can have Values looking like Auto-Negotiation, or 10BT, or
10BaseT.
In the Value box, select a value which either (a) explicitly says
half-duplex or semi-duplex, or (b) at least does not say full-duplex
[e.g. 10BaseT on its own is OK]. If there is a choice between 10 and
100 with half-duplex, choose the 10. Do not choose 10Base5, 10Base2, or
AUI.
Click OK to exit the Adapter settings.
Click OK to exit the Connection properties.
From: PawsForThought on 13 Oct 2005 12:37
Thanks for posting this, Robert. When I was having my "cable
unplugged" problem, I think I tried everything possible to track it
down. Then I replaced my ethernet card and it fixed the problem.

From: Robert L [MS-MVP] on 14 Oct 2005 11:27
Thank you for the feedback.

Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
"PawsForThought" <Mickey4Paws(a)anonymous.to> wrote in message news:1129221452.344909.265440(a)g47g2000cwa.googlegroups.com...
Thanks for posting this, Robert. When I was having my "cable
unplugged" problem, I think I tried everything possible to track it
down. Then I replaced my ethernet card and it fixed the problem.
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