DOCUMENT:Q182059 04-FEB-2000 [iis] TITLE :Cache ISAPI Application Option Causes ASP to Return Error PRODUCT :Internet Information Server PROD/VER:winnt:4.0,5.0 OPER/SYS: KEYWORDS: ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Internet Information Server 4.0 - Microsoft Internet Information Services version 5.0 ------------------------------------------------------------------------------- SYMPTOMS ======== It is possible to configure the way that Microsoft Internet Information Services (IIS) caches Internet Server Application Programming Interface (ISAPI) applications. Changing the default selection from caching ISAPI application to not caching ISAPI application causes IIS to return the following error to the browser when an Active Server Page (ASP) is executed on the server: The requested resource is in use CAUSE ===== This setting can be changed from the Web Site properties by selecting Configuration on the Home Directory tab. In Application Mappings there is a checkbox for the Cache ISAPI Applications option. Changing this selection modifies the default behavior of IIS . This option is for non-production testing only. If the Cache ISAPI Applications option is deselected, IIS does not cache ISAPI applications. All ISAPI applications are loaded and unloaded from IIS memory immediately after the ISAPI application is executed on the server, including ASP. ASP sets up application and session state object and variable that must be gracefully unloaded from memory. ASP returns the error when it is being unloaded from memory and an ASP page is attempting to execute. When ASP is loaded and unloaded from memory, an event is logged in the Windows NT Application event log. Event ID of Event 3 "Service started" and Event 4 "Service stopped" will be logged every time ASP is loaded or unloaded from memory. MORE INFORMATION ================ This behavior is by design. Microsoft welcomes suggestions or comments about changes in functionality and product design. You are invited to submit suggestions by filling out the form at the following Microsoft Web site: http://www.microsoft.com/regwiz/regwiz.asp Additional query words: ====================================================================== Keywords : Technology : kbiisSearch kbiis500 kbiis400 Version : winnt:4.0,5.0 Issue type : kbbug Solution Type : kbpending ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2000.