Microsoft KB Archive/937534

= Error messages are logged on a Windows Small Business Server 2003-based computer that is running ISA Server 2000 =

Article ID: 937534

Article Last Modified on 12/3/2007

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APPLIES TO


 * Microsoft Windows Small Business Server 2003 Premium Edition
 * Microsoft Windows Small Business Server 2003 Standard Edition

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SYMPTOMS
You configure incoming virtual private network (VPN) access on a Microsoft Windows Small Business Server 2003 (Windows SBS)-based computer that is also running Microsoft Internet Security and Acceleration (ISA) Server 2000. After you do that, remote clients can connect to the server by using a VPN connection. However, the remote clients cannot access any network shares. Additionally, the following error messages are logged in the Application log on the Windows SBS-based computer:

Error message 1

Event Source: Microsoft H.323 Gatekeeper

Event ID: 21075

Description: Failed to create a RAS context for the IP address. Please insure that no other application or service is using the H.225 RAS ports (1719 and 1718). Context status code: 00002741H Context status text: The requested address is not valid in its context.

Error message 2

Event Source: Microsoft H.323 Gatekeeper

Event ID: 21056

Description: An error has been returned by the  API. API error code: 00002741H. API error text: The requested address is not valid in its context.

Error message 3

Event Source: Microsoft H.323

Gatekeeper Event ID: 21056

Description: An error has been returned by the API. API error code: 00002741H. API error text: The requested address is not valid in its context.



CAUSE
This issue typically occurs when another service or another program that is running on the Windows SBS-based computer is accessing the H.225 remote access ports.



RESOLUTION
To resolve this issue, you must create a new gatekeeper, and then disable the WAN (PPP/SLIP) interface. To do this, follow these steps:  In ISA Server Management, right-click H323 Gatekeepers, and then click Add gatekeeper. If you cannot add a new gatekeeper and if the following error message is logged in the Application log, you may have to grant the Administrators group the correct permissions:

Event Source: DCOM

Event ID: 10016

Description: The application-specific permission settings do not grant Local Activation permission for the COM Server application with CLSID {3502C94C-FF68-11D2-BDE1-0000F81FDFDE} to the user  SID (S-1-5-21-2889785249-1173992337-4123802653-500).

This security permission can be modified using the Component Services administrative tool.

To grant the Administrators group the correct permissions, use the DCOM Config utility. To do this, follow these steps:  Click Start, click Run, type dcomcnfg, and then click OK. In the Component Services Microsoft Management Console (MMC) snap-in, expand Component Services, expand Computers, expand My Computer, and then click DCOM Config. Right-click Microsoft H.323 Gatekeeper, and then click Properties. Click the Security tab. Under Launch and Activation Permissions, click Edit.</li> Add the Administrators group to the list, and then enable the following permissions: <ul> Local Launch</li> Remote Launch</li> Local Activation</li> Remote Activation</li></ul> </li> Click OK two times.</li> Close the Component Services MMC snap-in.</li> In ISA Server Management, press F5 to update the console to view the new gatekeeper.</li></ol> </li> In the Add Gatekeeper dialog box, click This computer, and then click OK.</li> Right-click the server name that is listed under H.323 Gatekeepers, and then click Properties.</li> Click the Network tab.</li> Click to clear the WAN (PPP/SLIP) interface check box, click Apply, and then click OK.</li> Click Start, click Administrative Tools, and then click Services.</li> In the Services MMC snap-in, right-click Microsoft ISA Server Control, click All Tasks, and then click Restart.</li> Right-click Gatekeeper, click All Tasks, and then click Restart.</li></ol>

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