DOCUMENT:Q239483 04-FEB-2000 [iis] TITLE :Err Msg: Cannot Open Internet Site Http://. PRODUCT :Internet Information Server PROD/VER:winnt:5.0 OPER/SYS: KEYWORDS: ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Internet Information Services version 5.0 ------------------------------------------------------------------------------- SYMPTOMS ======== Web browser clients may receive the following error message: Cannot open Internet site http://. A connection to the server could not be established CAUSE ===== When executed, CGI applications run in their own memory space on a Web server. Each CGI application uses an IIS I/0 thread. By default, IIS is set to use a maximum of 256 I/O threads. If a CGI application stops responding or is experiencing a slow connection when performing data access, then users may reissue requests to the CGI application. CGI applications cannot be written to stop when the Web client ends the connection and will continue to run on the server. By default, CGI scripts will time out after 300 seconds. When CGI execution does not complete under heavy load, all of the IIS I/O threads may be used. This can cause the above error. RESOLUTION ========== Re-create CGI applications as ISAPI applications. Correctly written ISAPI applications can use a separate thread pool to handle requests and will use IIS I/O threads and memory much more efficiently, and allow for greater scalability. MORE INFORMATION ================ IIS does not terminate CGI applications when a HTTP connection is ends. Additional query words: iis cgi ====================================================================== Keywords : Technology : kbiisSearch kbiis500 Version : winnt:5.0 Issue type : kbprb 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.