Basic Auth may take precedence over Win Auth on IE 6 for a website hosted on IIS 7

Issue: =====For a website hosted on IIS 7, and having Basic and Windows Authentication both enabled we got the prompt for Basic Auth while browsing the site from IE 6. In other words IE 6 was not giving any precedence to Windows Auth over Basic Auth.  Resolution: ========We took some fiddler traces and  noticed that the…

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NTLM authentication may not work for websites based due to Network Security Policies

Issue: =============== We used to get three prompts resulting in 401.1 while our website hosted on IIS 6 was configured to use NTLM. The event logs showed following entries during the issue.   Event Type:   Failure Audit Event Source: Security Event Category:       Logon/Logoff Event ID:       529 Date:            10/08/2009 Time:            16:30:27 User:            NT AUTHORITY\SYSTEM Computer:     ********…

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Windows Authentication for accounts with large kerberos tickets may not work despite having MaxtokenSize in place

Issue: ========================= For users with large groups (100,120+), any webpage with integrated authentication enabled and hosted on IIS 6 did not come up and returns 401.1.   Resolution: ========================= This issue happens because of the size of Kerberos tokens and the issues webserver has while dealing with those. The following article http://support.microsoft.com/kb/327825 discusses a reg key MaxTokenSize…

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Too Frequent Application Pool recycling in IIS can lead to unexpected issues

Issue: ============================= We were getting following errors while browsing our asp.net web application in different websites.   1.  “Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was: 500”   2. An error has occurred in the application. Please contact administrator.    Object reference not…

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IISADMIN service failed to verify anonymous/wam account

Issue: ============= The websites were not working on IIS 6 and we got the following errors in event logs everytime we restarted IIS   Event Type:   Warning Event Source: IISADMIN Event Category:       None Event ID:       105 Date:            11/09/2009 Time:            09:17:55 User:            N/A Computer:     ServerName Description: IISADMIN service failed to verify anonymous/wam account DomainName\IUSRNAME. Some IIS functions…

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A situation when performance of a website go down after enabling WebGarden

Issue ====  An Asp website hangs intermittently and we saw the following errors in event logsEvent Type: Warning Event Source: W3SVC-WP Event Category: None Event ID: 2262 Date: 24/03/2010 Time: 14:37:58 User: N/A Computer: compurtername Description: ISAPI ‘C:\WINDOWS\system32\inetsrv\asp.dll’ reported itself as unhealthy for the following reason: ‘ASP unhealthy because 98% of executing requests are hung…

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