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Article ID: 818534 - Last Review: January 11, 2015 - Revision: 4.0

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If you install more than one remote access connection program, only one of the connection programs starts correctly. For example, if you install The Microsoft Network (MSN) software, and then you install AOL software, the AOL software may start, but the MSN software does not start.


This problem occurs because Microsoft Windows XP recognizes only the first .dll file that is listed in the HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Rasman\Parameters\CustomDLL subkey.


Service pack information

To resolve this problem, obtain the latest service pack for Microsoft Windows XP. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
322389  ( ) How to obtain the latest Windows XP service pack

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: (
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.


No prerequisites are required.

Restart requirement

You do not have to restart your computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
Date         Time   Version        Size     File name            Operating system
03-Jul-2003  16:38  5.1.2600.1243  163,840  Rasmans.dll          Windows XP 32-bit edition
03-Jul-2003  16:38  5.1.2600.1243  490,496  Rasmans.dll   IA-64  Windows XP 64-bit edition
03-Jul-2003  14:50  5.1.2600.1243  163,840  Wrasmans.dll  x86    Windows XP 64-bit edition 


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Microsoft Windows XP Service Pack 2.

More information

If you write a remote access custom-dial .dll file for Windows XP, you must register that file in the HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Rasman\Parameters\CustomDLL subkey. The CustomDLL subkey contains a list of custom-dial .dll files. Although more than one custom-dial .dll file may be listed in the CustomDLL subkey, Windows XP reads only the first custom-dial .dll file that is listed. If the custom-dial .dll file that you have written does not start the list, the customer dialer program does not start when you double-click the phone book entry. If the list starts with the custom-dial .dll file that you have written, the custom-dialer program starts. However, other demand dialer programs may stop working. For additional information about standard terminology used to describe software updates, click the following article number to view the article in the Microsoft Knowledge Base:
824684  ( ) Description of the standard terminology that is used to describe Microsoft software updates

Applies to
  • Microsoft Windows XP Professional
  • Microsoft Windows XP Home Edition
kbnosurvey kbarchive kbautohotfix kbhotfixserver kbqfe atdownload kbwinxpsp2fix kbregistry kbclient kbbroadband kbremoting kbfix kbbug kbwinxppresp2fix KB818534
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