Microsoft KB Archive/122318

= Using Null Modem for RAS with Third-Party PPP Clients =

Article ID: 122318

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Workstation 3.5
 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Server 3.5
 * Microsoft Windows NT Server 4.0 Standard Edition

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This article was previously published under Q122318



SYMPTOMS
When you attach a third-party Point-to-Point Protocol (PPP) client to a Remote Access Service (RAS) server via a null modem cable, the RAS server port status reports a hardware failure and no connection is made.



CAUSE
This problem occurs due to the null modem scripts in the MODEM.INF file being specifically written for Windows NT computers only.



RESOLUTION
To correct this problem, you can modify the Null Modem entry in the MODEM.INF file for the Windows NT RAS server and the INI extension file for the third-party PPP client.

NOTE: If you are using Modem.inf with Microsoft Windows NT version 4.0, see the following article in the Microsoft knowledge base:

ARTICLE-ID: 150808

TITLE : Disabling Support for Unimodem Modems in Remote Access

Server Side
Change the Null Modem entry in the MODEM.INF file to the following:

  CALLBACK_TIME=10 DEFAULTOFF=compression MAXCARRIERBPS=19200 MAXCONNECTBPS=19200

COMMAND_INIT= NoResponse

COMMAND_LISTEN= CONNECT=$ CONNECT= CLIENT COMMAND_LISTEN= NoResponse

COMMAND_DIAL=CLIENT CONNECT=SERVER

Client Side
For the client side, you want to send a "$" (without quotation marks) to signify a CONNECT. For example, the Chameleon product from NetManage, Inc., uses a SLIP.INI file to send scripts. In the section for Windows NT, change the following lines:

  "script=-n" to "script=-n $$ -n" (without quotes)

The Chameleon product discussed here is manufactured by NetManage, Inc., a vendor independent of Microsoft; we make no warranty, implied or otherwise, regarding this product's performance or reliability.

Additional query words: prodnt serial 3rdparty

Keywords: kb3rdparty KB122318

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