Lost network connection

[Tim Brown]

I have a user who uses Windows XP professional. Intermittently, her PC will
drop off the network and she will get a 'Disconnected from (servername)' and
she is unable to access any network drives. This can only be overcome by
restarting the PC. She still has connectivity to the network when this
happens (Can ping the network).

Could someone explain to me how this works? i.e. Does the OS constantly poll
the network? What process tells the workstation that it is no longer
connected to the network? etc?

 

[Neil]

I have the same problem with my XP users. They
periodically lose connection to our domain controller -
usually though we can reconnect using the synchronisation
icon and not having to restart. However, I have no idea
why the connection keeps dropping - and it has no rhythm
to it.

 

[Malke]

I have the same problem with my XP users. They
periodically lose connection to our domain controller -
usually though we can reconnect using the synchronisation
icon and not having to restart. However, I have no idea
why the connection keeps dropping - and it has no rhythm
to it.

You will want to go into the registry on your XP boxen and change the
setting on this key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lanmanserve
\parameters

to have a value (decimal) of 65535.

Malke

 

[Steve Nielsen]

Although I am not an NT server expert, in other network servers I have
worked with it is the server that polls the workstation for a active
connection, so this may be a server configuration issue if other
workstations are having the problem. If she's the only one then it may
be network speed/duplex mismatches between workstation and server and
other devices in the path, or a hub or switch that may be
malfunctioning. I'd try plugging her into a different port on the
switch/hub first. If that does not resolve the problem then check the
speed/duplex/frame-type settings on her workstation. Usually Auto on
everything works best but occaisionally you may need to exactly match
what the hub or switch can do as follows:

10Mb switch - use 10Mb/full duplex on workstation
100Mb switch - use 100/full duplex on workstation
10Mb hub - use 10/half duplex on workstation
100Mb hub - use 100/half duplex on workstation

Steve

 

[Joe Wu [MSFT]]

Hello Tim,

Thank you for your post.

Let's adjust several registry keys to see if the problem can be resolved:

Client side settings
==========
Please add KeepConn key on the Windows XP client computer to see if the
issue continues.

1) Run regedit.exe and browse to the following subkey:

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Para
meters]


2) Add an entry titled "KeepConn", and set value according to this table:

NAME: KeepConn
TYPE: REG_DWORD
DATA: 65535


Also, make sure that you don't have this set:



HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Networkprovider\RestoreC
onnection=1 (default = 0)


Value 1 makes the system to disable restoring the network connections.


Server side settings
==========
On the server computer to which the client computer are connecting
(server side). Please run the following command:

1. Click Start, Click Run
2. Type: CMD
3. Type: Net Config Server /autodisconnect:-1

Restart both the server and client and check if the problem occurs again.
If the problem still persists, I would like to suggest that you install the
NetBEUI protocol to check if it helps.

By the way, I have troubleshooted several similar issues before. We can try
the above steps first. Based on my experience, the most possible cause is a
certain anti-virus application running in the background. We may check this
later.

Please let me know if anything is unclear. Thanks for your time and efforts!

Regards,
Joe Wu
Product Support Services
Microsoft Corporation

Get Secure! - www.microsoft.com/security

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--------------------
|From: "Tim Brown" <[email protected]>
|Subject: Lost network connection
|Date: Fri, 5 Dec 2003 15:44:43 -0000
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|X-Tomcat-NG: microsoft.public.windowsxp.general
|
|I have a user who uses Windows XP professional. Intermittently, her PC
will
|drop off the network and she will get a 'Disconnected from (servername)'
and
|she is unable to access any network drives. This can only be overcome by
|restarting the PC. She still has connectivity to the network when this
|happens (Can ping the network).
|
|Could someone explain to me how this works? i.e. Does the OS constantly
poll
|the network? What process tells the workstation that it is no longer
|connected to the network? etc?
|
|
|

 

[Neil]

Hey Malke,

Thanks for this information - but which parameter should
I change to the new value?

Neil