Microsoft KB Archive/273634

= Netscape Browsers Do Not Support the NetMeeting-installed CALLTO Protocol =

Article ID: 273634

Article Last Modified on 7/24/2007

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APPLIES TO


 * Microsoft NetMeeting 3.01 Standard Edition
 * Microsoft NetMeeting 3.0
 * Microsoft NetMeeting 3.0
 * Microsoft NetMeeting 3.0
 * Microsoft NetMeeting 3.01 Standard Edition
 * Microsoft NetMeeting 3.0
 * Microsoft NetMeeting 3.01 Standard Edition
 * Microsoft NetMeeting 3.01 Standard Edition
 * Microsoft NetMeeting 3.01 Standard Edition

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This article was previously published under Q273634



SYMPTOMS
Netscape browsers return an HTTP 404 &quot;The page cannot be found,&quot; message when you click on a hyperlink referencing the CALLTO protocol.



CAUSE
The Netscape browser does not support the CALLTO protocol. As a result, any anchors with href=callto:// are treated as local paths, and are appended to the base URL for the specified Web site. For example, if a Netscape browser requests the following hyperlink

callto://ils.microsoft.com:1002/username@hotmail.com

from http://www.microsoft.com, the browser interprets the request as

http://www.microsoft.com/callto://ils.microsoft.com:1002/username@hotmail.com

Because this interpreted URL does not exist, the server returns a standard HTTP 404 message, indicating that the page cannot be found.



WORKAROUND
In addition to configuring the CALLTO protocol, when you install NetMeeting, Setup also registers the .uls application extension for use with the NetMeeting client. This association of the .uls extension with NetMeeting allows applications that do not support the CALLTO protocol to initiate a NetMeeting call to another NetMeeting user, assuming the appropriate information is included in the file. Two methods for generating a .uls file are provided in this section.

Microsoft provides programming examples for illustration only, without warranty either expressed or implied, including, but not limited to, the implied warranties of merchantability and/or fitness for a particular purpose. This article assumes that you are familiar with the programming language being demonstrated and the tools used to create and debug procedures. Microsoft support professionals can help explain the functionality of a particular procedure, but they will not modify these examples to provide added functionality or construct procedures to meet your specific needs. If you have limited programming experience, you may want to contact a Microsoft Certified Partner or the Microsoft fee-based consulting line at (800) 936-5200. For more information about Microsoft Certified Partners, please visit the following Microsoft Web site:

https://partner.microsoft.com/global/30000104

For more information about the support options that are available and about how to contact Microsoft, visit the following Microsoft Web site:

http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

Method 1
Develop a custom ISAPI extension or COM object to generate the .uls file. A sample COM object is available from the link below. The following file is available for download from the Microsoft Download Center:

Download HostName.exe now

Release Date: January 14, 2000

For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to Obtain Microsoft Support Files from Online Services

Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help to prevent any unauthorized changes to the file.

Method 2
Generate the .uls file dynamically by using a scripting language, such as Microsoft Visual Basic, Scripting Edition, (VBScript), JScript, or Perl, and the FileSystemObjects.



Steps to Reproduce Behavior
 Copy the Ilsusers.asp sample code from &quot;Method 2&quot; in the following Microsoft Knowledge Base article:

266626 ILS 2.0 Sample Templates Do Not Work with Windows 2000 Site Server ILS Service

 Connect a NetMeeting client to the Ilsusers.asp sample. Open a Netscape browser, and click one of the links on the Ilsusers.asp to connect to an ILS-registered NetMeeting client. You receive the HTTP 404 message from the invalid URL that the browser is redirected to.

This lack of support has not been an issue until the release of ILS 3.0 on Microsoft Windows 2000. ILS 2.0 includes an ISAPI extension (Ulserver.dll), which includes a feature that downloads a file to a client in response to a properly formatted GET request. In ILS 2.0, when a client requests an URL with the following format

http://ils.microsoft.com/scripts/ulserver.dll?action=resolve;uid=ILSusername;appid=ms-netmeeting;protid=h323

NOTE: The preceding URL may be displayed on multiple lines, but should appear on the same line in the address bar of the browser.

the ILS 2.0 server sends that client a text file called Ulserver.uls, which contains the following text: < [res] hr=0 ip=192.168.0.101 port=1720 mt=text/iuls uid=ILSusername url=action=resolve;uid=ILSusername;appid=ms-netmeeting;protid=h323

></IULS> The Ulserver.uls file is generated dynamically based on information collected from the client's GET request, specifically, the client's IP address (resolved by the ILS server), and UID (included in the query string sent with the GET request). Because of the dynamic nature of this client data, the ILS user list cannot be static or hard-coded, and requires the implementation of one of the methods recommended in the &quot;Workaround&quot; section.

Additional query words: iis 5 HostName

Keywords: kbdownload kbgraphxlinkcritical kbpending kbprb kbsamplepro KB273634

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