| Event Id | 1009 |
| Source | ASP.NET 1.1.4322.0 |
| Description | aspnet_wp.exe (PID: %1) failed to startup because the synchronization event
could not be initialized The following files have different versions: aspnet_isapi.dll System.Web.dll. |
| Event Information | When you open an ASP.NET Web page in a Microsoft Application Center 2000
cluster, you receive the following error message and event id 1084 and 1009 from
the source ASP.NET 1.1.4322.0 in event viewer. "Server Application Unavailable| The web application you are attempting to access on this web server is currently unavailable. Please hit the “Refresh” button in your web browser to retry your request. Administrator Note: An error message detailing the cause of this specific request failure can be found in the application event log of the web server. Please review this log entry to discover what caused this error to occur" CAUSE: This problem occurs when you have two different versions of some Microsoft .NET Framework 1.1 files installed in the Application Center cluster. Two different versions of some files may be installed when you install a .NET Framework service pack on a member server. If you install a service pack on a member server and not on the controller, the controller replicates an earlier version of the Internet Server API (ISAPI) filter. This filter was updated on the member server when you installed the service pack. Therefore, on the member server, the System.web.dll file may be version 1.1.4322.2032 (SP1) and the ISAPI filter Aspnet_isapi.dll file may be version 1.1.4322.573. Note This problem may occur when you install any .NET Framework service pack on a member server. RESOLUTION: To resolve this problem, use one of the following methods: a: Make sure that the versions of the .NET Framework 1.1 match in the Application Center cluster. When you install the .NET Framework 1.1 service pack in the cluster, you must install the service pack on the cluster controller first. Then, you must install the service pack on all the member servers. b: Remove the .NET Framework 1.1 service pack from the member server. |
| Reference Links | Event ID 1084 and event ID 1009 errors occur when you open an ASP.NET Web page in an Application Center 2000 cluster |
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