RAS Disconnects Due to Line Noise When Using Multitech Modems (181380)
The information in this article applies to:
- Microsoft Windows NT Workstation 3.51
- Microsoft Windows NT Workstation 4.0
- Microsoft Windows NT Server 3.51
- Microsoft Windows NT Server 4.0
- Microsoft Windows 95
This article was previously published under Q181380 SYMPTOMS
After dialing into a Windows NT Remote Access Service (RAS) server, where
the RAS server and the RAS client use Multitech MT2834 modems, Windows NT
RAS clients and Windows 95 Dial-Up Networking (DUN) clients may randomly
disconnect from the RAS server with one of the following error messages:
Windows NT RAS Client
Event ID : 20050
Source : Remote Access
Description: The user <domain\userid> connected on port <com port> on
<date> at <time> and disconnected on <date> at <time>. The
user was active for <time length>. <# bytes> bytes were
sent and <# bytes> bytes were received. The port speed was
28800. The reason for disconnecting was administrator's
request.
Windows 95 DUN Client
You have been disconnected from the computer you dialed. Double-click
the connection to try again.
CAUSE
Disconnects may be caused by one of the following: - Inactivity Timeout:
If you are being disconnected at a regular interval, the system you
dialed may have an Inactivity Timer that is set fairly low (5-10
minutes). For example, if you are reading a Web page through a
connection to an Internet Service Provider (ISP) and are not actively
doing anything other than scrolling up or down, the Inactivity Timer can
disconnect you.
-or-
- Line Noise causing a modem retrain:
If you have irregular disconnect problems (immediate disconnect or
random disconnect), you may want to modify the default initialization
string on your modem, as Multitech modems will automatically try to
resynchronize an already established connection, when line noise or
other aberrations affect the quality of the connection.
RESOLUTION
To resolve this issue, use one of the following methods:
Inactivity Timeout
Contact your RAS administrator to increase the Inactivity Timer value.
Line Noise Causing a Modem Retrain
Use the following steps to change the Multitech modem's initialization
string on the RAS or DUN client:
Windows NT version 4.0 and Windows 95: - Click Start, point to Settings, and click Control Panel.
- Double-click Modems, select the Multitech modem, and click Properties.
- Click the Connection tab, click Advanced, and type the following in the
Extra Settings field:
- Click OK, click OK, and click Close.
Windows NT version 3.51:
In Windows NT version 3.51, RAS uses a file called Modem.inf in the
%Systemroot%\system32\ras sub-directory to send the right communication
strings to the modem through the selected modem in RAS. Use a text editor,
such as Notepad.exe to open the Modem.inf file. Then find the modem you
selected in RAS, and check the COMMAND_INIT string, which is the
communication string RAS sends to set up the modem for communication. Refer
to the "Modifying MODEM.INF" section in the RAS Online Help program and the
modem init string in step three above.
This string will make sure your modem does not initiate a speed change
while it is connected because of line noise or other unfavorable
conditions. Your modem, will, however, still follow any speed change that
the other modem makes. This will ensure that your modem does not cause a
disconnect.
MORE INFORMATION
The third-party products discussed here are manufactured by vendors
independent of Microsoft; we make no warranty, implied or otherwise,
regarding these products' performance or reliability.
Modification Type: | Major | Last Reviewed: | 12/6/2003 |
---|
Keywords: | kb3rdparty kberrmsg kbnetwork KB181380 |
---|
|