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Logging data about multicast streams

To log data about players that receive content as a multicast stream, you can use the Multicast and Advertisement Logging Agent, which installs the Windows Media Internet Server Application Programming Interface (ISAPI) extension (wmsiislog.dll).

The Multicast and Advertisement Logging Agent must be installed by an administrator to allow it to write its properties to the registry and is available as an optional component of Windows Media Services setup. After installation it reads its configuration setting from the registry of the Web server it is installed on. For more information on the properties of the ISAPI application, see the ISAPI properties reference. The ISAPI extension is installed in the %systemdrive%\WMPub\Wmiislog folder.

Log files for multicast clients are saved to the %systemroot%\System32\LogFiles\WMS_ISAPI folder. This folder is created automatically when you register wmsiislog.dll. Each log file name uses the WMS_ISAPI_yyyymmdd.log format, where yyyymmdd is the year, month, and day when the log file is created. If more than one log file is generated in a day, an incremented number is added to the file name, using the format WMS_yyyymmdd_iiii.log, where iiii is a number that starts at 0001 and increases by one for every log file generated after the first one. Make sure you have configured Internet Information Services (IIS) to support Internet Server Application Programming Interface (ISAPI) applications so that Wmsiislog.dll can receive logs. You can also write a Common Gateway Interface (CGI) script to generate a log file.

The information that is generated in a log file for a multicast client is the same as information generated by the WMS Client Logging plug-in, except that it does not have server statistics. For information about the fields in a log file, see Log file header reference and Log file entries reference.

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