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• Host http:// and https:// for same domain on separate IIS servers

  - by The Talking Walnut

  Is it possible to host http://example.com and https://example.com on two separate IIS servers?

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• iis windos authentication way to turn off password prompt

  - by Ellery Newcomer

  IIS noobie here. I have an intranet website hosted by IIS (6? I'll check after the weekend) that is set to Windows Authentication. Whenever there is some sort of authentication failure, the website gives the user a windows account sort of password prompt and doesn't display a 403 (or 401 or whatever) page unless the user cancels the prompt. However, entering a password is never, ever a use case for this website. Is there a way to turn off the password prompt and just display the error page? Bonus: are there any good hooks for this precise point for code that would do diagnosis and logging?

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• Adding multiple websites with different SSL certificates in IIS 7

  - by Timka

  I'm having troubles using SSL for 2 different websites on my IIS 7 server. Please see my setup below: website1: my.corporate.portal.com SSL certificate for website1: *.corporate.portal.com https/443 binded to my.corporate.portal.com website2: client.portal.com SSL certificate issued for: client.portal.com When I try to bind https in IIS7 with the client's certificate, I don't have an option to put host name(grayed out) and as soon as I select 'client.portal.com' cert, I'm getting the following error in IIS: At least one other site is using the same HTTPS binding and the binding is configured with a different certificate. Are you sure that you want to reuse this HTTPS binding and reassign the other site or sites to use the new certificate? If I click 'yes' my.corporate.portal.com website stops using the proper SSL cert. Could you suggest something?

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• nginx + IIS + GET

  - by Eralde

  I have nginx on pc "A" & IIS with ASP.NET on pc "B". nginx is configured like this: ... location ~ ((Web|Script)Resource.*)$ { proxy_pass "B"/$1; proxy_redirect off; proxy_set_header REMOTE_ADDR $remote_addr; proxy_set_header REQUEST_URI $request_uri; proxy_set_header HTTP_REFERER $http_referer; #proxy_set_header REQUEST_URI $request_uri; proxy_set_header QUERY_STRING $query_string; proxy_set_header X-Real-IP $remote_addr; proxy_set_header Host $http_host; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; }... but requests to "B"/WebScript?a=b&c=d aren't able to deliver GET data (a=b&c=d) to IIS part. Could anyone help with this?

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• Configuring IIS site to use HTTPS

  - by James

  I am working on a REST API which I have currently deployed on a Win XP Professional SP2 development machine running IIS 5.1. The site is currently being hosted on port 81 and being accessed via HTTP. I would now like to configure the site to stop using HTTP and use HTTPS only. I have developed a self-signed certificate using the SelfSSL.exe tool from the 6.0 Resource Kit Tools and set the Common Name to be the IP of my server (as it's a local development machine it has no domain name). I have also already configured the site to use SSL using the How To Set Up an HTTPS Service in IIS tutorial as my guide. However, whenever I try to access a resource in the API via HTTPS I get a 404. Any ideas?

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• IIS doesn't respond to 127.0.0.1 (external IP works fine)

  - by Jordan

  I have an AWS web server - call it box.company.com. It's running IIS and if I visit http://box.company.com in a web browser (from any machine, including box.company.com), it responds correctly with our site. However, if I visit localhost/ or 127.0.0.1/ when I'm logged into box.company.com, I get a "couldn't connect to host" message. The hosts file has only one entry - the standard "127.0.0.1 localhost" line. Pinging 127.0.0.1 works fine. Pinging localhost correctly resolves to 127.0.0.1 and works fine. I've tried restarting IIS and restarting the DNS Cache. I had this problem once before, and restarting the server fixed it, but I'd like to know what's going on in case this happens again in the future.

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• IIS 7 with PHP in Domain with Windows Authentication

  - by Michal Saiyan Hajdony

  I have Windows Server 2008 R2 x64b installed with IIS 7, PHP 5.5. This server is added to domain exampledomain , so I have win authentication enabled and all others disabled. I left the two default providers NTLM and negotiate, I granted IIS_IUSRS read access to wwwroot. So far it has worked for me only as I am added to the Administrators group which has read/write access to wwwroot folder. Yet, when someone else is trying to connect, he gets a credentials window and when he puts the domain name and password he cannot get access to the page. The issue is solved when I add read permission to "Domain users" - then all works fine. BUT. My issue is that if one opens windows explorer and types \\servername\wwwroot one can see the files and read them. I have never configured IIS before so I know I miss some really important thing. How can I solve the file visibility problem?

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• How to disable multiple form submit (POST) in IIS

  - by user1209640

  We had a major SharePoint outage a few months back because a user wedged their keyboard in such a way as to cause the Enter button to be pressed indefinitely. The user was on a customized people search page and hundreds of POSTs by the same user were submitted asynchronously, which overloaded the server. Because I work in a large organization, I am looking for a more global way to prevent this from happening. Is there a way to prevent multiple web form submissions by a common user within a short period of time within IIS? I am aware we can write javascript to disable the button after it is clicked, but we are hoping to prevent this issue from occurring on other pages where a similar possibility may exist. Update: It appears looking at the source code, the javascript is performing a document.location = url, whenever keycode 13 (Enter) is pressed. Again, we can write JS to prevent this in this location, but we also want to be able to guard against this kind of issue more generally... preferably at the IIS level.

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• Sending error logs through C# desktop application

  - by Mustafa A. Jabbar

  Dear All, lately our customers are experiencing unexpected crashes. We are already logging the errors on their local machines. Is there a mechanism to enable them to "send error log" somehow when the application crashes or when unexpected behavior takes place? In other word how do I know that the application freezed or hung or crashed so I can send something, and override the normal "not responding" windows message? Regards,

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• Append all logs to /var/log

  - by iCy

  Application scenario: I have the (normal/permanent) /var/log mounted on an encrypted partition (/dev/LVG/log). /dev/LVG/log is not accessible at boot time, it needs to be manually activated later by su from ssh. A RAM drive (using tmpfs) is mounted to /var/log at init time (in rc.local). Once /dev/LVG/log is activated, I need a good way of appending everything in the tmpfs to /dev/LVG/log, before mounting it as /var/log. Any recommendations on what would be a good way of doing so? Thanks in advance!

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• IIS HTTP Error 403.1 - Forbidden: Execute access is denied

  - by coxymla

  I have a ASP.NET 1.1 application running on IIS 6 / Windows Server 2003. It's our application, but we're trying to specifically replicate a customer's installation so the app folder has been copied entirely from their production server onto our test machine, and then we've created the Virtual Directory and Web Application for IIS manually. The problem I have is that when we access the app, we get the standard IIS security error message: The page cannot be displayed You have attempted to execute a CGI, ISAPI, or other executable program from a directory that does not allow programs to be executed. -------------------------------------------------------------------------------- Please try the following: •Contact the Web site administrator if you believe this directory should allow execute access. HTTP Error 403.1 - Forbidden: Execute access is denied. Internet Information Services (IIS) Now this is pretty standard, except as far as I can see it's not anything so simple. I have checked: IIS user has read access to the directory IIS user and Network Service users have read/write access to the Temporary ASP.NET Files folder Virtual directory is set to the correct version of ASP.NET ASP.NET 1.1 Web Service Extension is allowed Virtual directory has the correct mappings of file extensions and all verbs to the aspnet 1.1 DLL Virtual directory properties allow Scripts and Executables to be run Anonymous access is turned on and the username and password is correct What am I missing?

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• Can I use IIS to do ActiveDirectory single-sign-on for another website?

  - by brofield

  I'm trying to add Active Directory single-sign-on support to an existing SOAP server. The server can be configured to accept a trusted reverse-proxy and use the X-Remote-User HTTP header for the authenticated user. I want to configure IIS to be the trusted proxy for this service, so that it handles all of the Active Directory authentication for the SOAP server. Basically IIS would have to accept HTTP connections on port X and URL Y, do all the authentication, and then proxy the connection to a different server (most likely the same X and Y). Unfortunately, I have no knowledge of IIS or AD (so I am trying my best to learn enough to build this solution) so please be gentle. I would assume that this is not an uncommon scenario, so is there some easy way to do this? Is this sort of functionality built into IIS or do I need to build some sort of IIS proxy program myself? Is there a better option for getting the authentication done and the X-Remote-User HTTP header set than requiring IIS? Update: For example, what I am trying to create is: [CLIENT] [IIS] [AD] [SOAP-SERVER] 1. |---------------->| 2. |<--------------->|<---------->| 3. |--------------------------->| 4. |<---------------------------| 5. |<----------------| 1. POST to http://example.com/foo/bar.cgi 2. Client is not authenticated, so do authentication 3. Once validated, send request to server (X-Remote-User: {userid}) 4. Process request, send response 5. Forward response to client I need to know how to configure IIS to do the automatic authentication of the user using AD, and then to proxy the request to the actual server, sending the userid in the X-Remote-User HTTP header.

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• Using IIS Logs for Performance Testing with Visual Studio

  - by Tarun Arora

  In this blog post I’ll show you how you can play back the IIS Logs in Visual Studio to automatically generate the web performance tests. You can also download the sample solution I am demo-ing in the blog post. Introduction Performance testing is as important for new websites as it is for evolving websites. If you already have your website running in production you could mine the information available in IIS logs to analyse the dense zones (most used pages) and performance test those pages rather than wasting time testing & tuning the least used pages in your application. What are IIS Logs To help with server use and analysis, IIS is integrated with several types of log files. These log file formats provide information on a range of websites and specific statistics, including Internet Protocol (IP) addresses, user information and site visits as well as dates, times and queries. If you are using IIS 7 and above you will find the log files in the following directory C:\Interpub\Logs\ Walkthrough 1. Download and Install Log Parser from the Microsoft download Centre. You should see the LogParser.dll in the install folder, the default install location is C:\Program Files (x86)\Log Parser 2.2. LogParser.dll gives us a library to query the iis log files programmatically. By the way if you haven’t used Log Parser in the past, it is a is a powerful, versatile tool that provides universal query access to text-based data such as log files, XML files and CSV files, as well as key data sources on the Windows operating system such as the Event Log, the Registry, the file system, and Active Directory. More details… 2. Create a new test project in Visual Studio. Let’s call it IISLogsToWebPerfTestDemo.   3.  Delete the UnitTest1.cs class that gets created by default. Right click the solution and add a project of type class library, name it, IISLogsToWebPerfTestEngine. Delete the default class Program.cs that gets created with the project. 4. Under the IISLogsToWebPerfTestEngine project add a reference to Microsoft.VisualStudio.QualityTools.WebTestFramework – c:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\PublicAssemblies\Microsoft.VisualStudio.QualityTools.WebTestFramework.dll LogParser also called MSUtil - c:\users\tarora\documents\visual studio 2010\Projects\IisLogsToWebPerfTest\IisLogsToWebPerfTestEngine\obj\Debug\Interop.MSUtil.dll 5. Right click IISLogsToWebPerfTestEngine project and add a new classes – IISLogReader.cs The IISLogReader class queries the iis logs using the log parser. using System; using System.Collections.Generic; using System.Text; using MSUtil; using LogQuery = MSUtil.LogQueryClassClass; using IISLogInputFormat = MSUtil.COMIISW3CInputContextClassClass; using LogRecordSet = MSUtil.ILogRecordset; using Microsoft.VisualStudio.TestTools.WebTesting; using System.Diagnostics; namespace IisLogsToWebPerfTestEngine { // By making use of log parser it is possible to query the iis log using select queries public class IISLogReader { private string _iisLogPath; public IISLogReader(string iisLogPath) { _iisLogPath = iisLogPath; } public IEnumerable<WebTestRequest> GetRequests() { LogQuery logQuery = new LogQuery(); IISLogInputFormat iisInputFormat = new IISLogInputFormat(); // currently these columns give us suffient information to construct the web test requests string query = @"SELECT s-ip, s-port, cs-method, cs-uri-stem, cs-uri-query FROM " + _iisLogPath; LogRecordSet recordSet = logQuery.Execute(query, iisInputFormat); // Apply a bit of transformation while (!recordSet.atEnd()) { ILogRecord record = recordSet.getRecord(); if (record.getValueEx("cs-method").ToString() == "GET") { string server = record.getValueEx("s-ip").ToString(); string path = record.getValueEx("cs-uri-stem").ToString(); string querystring = record.getValueEx("cs-uri-query").ToString(); StringBuilder urlBuilder = new StringBuilder(); urlBuilder.Append("http://"); urlBuilder.Append(server); urlBuilder.Append(path); if (!String.IsNullOrEmpty(querystring)) { urlBuilder.Append("?"); urlBuilder.Append(querystring); } // You could make substitutions by introducing parameterized web tests. WebTestRequest request = new WebTestRequest(urlBuilder.ToString()); Debug.WriteLine(request.UrlWithQueryString); yield return request; } recordSet.moveNext(); } Console.WriteLine(" That's it! Closing the reader"); recordSet.close(); } } }   6. Connect the dots by adding the project reference ‘IisLogsToWebPerfTestEngine’ to ‘IisLogsToWebPerfTest’. Right click the ‘IisLogsToWebPerfTest’ project and add a new class ‘WebTest1Coded.cs’ The WebTest1Coded.cs inherits from the WebTest class. By overriding the GetRequestMethod we can inject the log files to the IISLogReader class which uses Log parser to query the log file and extract the web requests to generate the web test request which is yielded back for play back when the test is run. namespace IisLogsToWebPerfTest { using System; using System.Collections.Generic; using System.Text; using Microsoft.VisualStudio.TestTools.WebTesting; using Microsoft.VisualStudio.TestTools.WebTesting.Rules; using IisLogsToWebPerfTestEngine; // This class is a coded web performance test implementation, that simply passes // the path of the iis logs to the IisLogReader class which does the heavy // lifting of reading the contents of the log file and converting them to tests. // You could have multiple such classes that inherit from WebTest and implement // GetRequestEnumerator Method and pass differnt log files for different tests. public class WebTest1Coded : WebTest { public WebTest1Coded() { this.PreAuthenticate = true; } public override IEnumerator<WebTestRequest> GetRequestEnumerator() { // substitute the highlighted path with the path of the iis log file IISLogReader reader = new IISLogReader(@"C:\Demo\iisLog1.log"); foreach (WebTestRequest request in reader.GetRequests()) { yield return request; } } } }   7. Its time to fire the test off and see the iis log playback as a web performance test. From the Test menu choose Test View Window you should be able to see the WebTest1Coded test show up. Highlight the test and press Run selection (you can also debug the test in case you face any failures during test execution). 8. Optionally you can create a Load Test by keeping ‘WebTest1Coded’ as the base test. Conclusion You have just helped your testing team, you now have become the coolest developer in your organization! Jokes apart, log parser and web performance test together allow you to save a lot of time by not having to worry about what to test or even worrying about how to record the test. If you haven’t already, download the solution from here. You can take this to the next level by using LogParser to extract the log files as part of an end of day batch to a database. See the usage trends by user this solution over a longer term and have your tests consume the web requests now stored in the database to generate the web performance tests. If you like the post, don’t forget to share … Keep RocKiNg!

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• IIS 7.5 saving configuration settings to web.config with IIS Manager

  - by Caroline Beltran

  I installed IIS 7.5 (Windows 7) on two different PCs, one PC saves configuration to applicationHost.config and the other to web.config! Screenshot: As you can see, the PC on the left does not contain the settings (they are stored in applicationHost.config) and the PC to the right does in fact store the settings in web.config. I have not and hope not to modify the configuration files by hand and would like to do it using IIS Manager only. Does anyone know why this happens or if there is some setting to force configuration to the web.config file? Thank you. Edit: I am adding a screenshot of the applicationHost.config file (PC on the left) demonstrating how the configuration is stored in it instead of inside the web.config file.

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• Unable to set password in IIS 8 for Domain User as ApplicationPool Identity

  - by Niels R.

  I'm trying to set a Domain User account as ApplicationPool Identity in IIS 8 (Windows 2012). When trying this using the IIS Management Console I always get an error: Value does not fall within the expected range. When trying to set the identity using appcmd.exe it fails on both the command setting the username and password or the command only setting the password. Setting the username is no problem. Trying to set both the username and password [FAIL]: >appcmd set config /section:applicationPools /[name='AppPoolName'].processModel.identityType:SpecificUser /[name='AppPoolName'].processModel.userName:DOMAIN\Username /[name='AppPoolName'].processModel.password:P4ssW0rd Applied configuration changes to section "system.applicationHost/applicationPools" for "MACHINE/WEBROOT/APPHOST" at configuration commit path "MACHINE/WEBROOT/APPHOST" ERROR ( hresult:80070057, message:Failed to commit configuration changes. The parameter is incorrect. ) Trying to set only the username [SUCCESS]: >appcmd set config /section:applicationPools /[name='AppPoolName'].processModel.identityType:SpecificUser /[name='AppPoolName'].processModel.userName:DOMAIN\Username Applied configuration changes to section "system.applicationHost/applicationPools" for "MACHINE/WEBROOT/APPHOST" at configuration commit path "MACHINE/WEBROOT/APPHOST" Trying to set the password after successfully setting the username [FAIL]: >appcmd set config /section:applicationPools /[name='AppPoolName'].processModel.identityType:SpecificUser /[name='AppPoolName'].processModel.password:P4ssW0rd Applied configuration changes to section "system.applicationHost/applicationPools" for "MACHINE/WEBROOT/APPHOST" at configuration commit path "MACHINE/WEBROOT/APPHOST" ERROR ( hresult:80070057, message:Failed to commit configuration changes. The parameter is incorrect. ) I added the Domain User to the IIS_IUSRS group and allowed it to "Log on as a service". Any suggestions what I might be doing wrong?

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• IIS serving static content gives 503 at random

  - by Steffen

  We're having a few issues with our image server. It's a Win 2008 running IIS 7.5 and it only serves static content: images. It has run without issues for quite a while, until recently when we disabled Output Caching, as we noticed having it enabled meant it sent no-cache host-headers to the clients (forcing them to fetch the images from the server every time) We've read quite a bit about it, and it seems IIS just works that way - either you use Output Caching or you get to use cache host-headers. Anyway having disabled the Output Cache, we now experience random 5 minutes intervals, where all requests just get a 503 Service Unavailable. During this period the "Files cached" performance counter staggers (neither increased nor decreased) and after the period all caches are flushed. You might find it weird I talk about caching, since we disabled Output Caching. The thing is we changed the ObjectTTL parameter in registry, so we cache files for 3 minutes (which has worked very well, our Disk I/O dropped significantly) So even with Output Caching disabled, we're still caching plenty of files - if we could just get rid of the random 503 it'd be perfect :-D We don't get any messages in the Windows event log during these 503 intervals, so we're pretty stumped as to what to do. Any ideas are very welcome :-)

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• where can I find the user in this IIS error 'Login failed for user 'IIS APPOOL\Web2'

  - by Jack

  I encounter the following error: Cannot open database "testbase" requested by the login. The login failed. Login failed for user 'IIS APPPOOL\Web2'. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Data.SqlClient.SqlException: Cannot open database "testbase" requested by the login. The login failed. Login failed for user 'IIS APPPOOL\Web2'. So, where can I give this user Web2 permission? (By the way, the server do not have such user Web2 but there is a folder called Web2 located at the wwwroot folder.) I search for answers but all failed as follows: [1] Add the user IUSR to the folder and give it read permission. [2] http://www.codekicks.com/2008/11/cannot-open-database-northwind.html [3] http://blog.sqlauthority.com/2009/08/20/sql-server-fix-error-cannot-open-database-requested-by-the-login-the-login-failed-login-failed-for-user-nt-authoritynetwork-service/

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• Can IIS (Ideally Azure) do SSL Proxying?

  - by Acoustic

  My team has been asked to add a new feature to a project we're working on, and none of can find authoritative details on whether it's possible with Windows/IIS. The short of it is that we're hoping to have customers update their DNS with a CNAME record to point their website to our server instead of theirs (they why's are trivial - it's what the app does on behalf of your site). We're using a reverse proxy with several custom modules to serve particular content from the original servers. So far everything works perfectly until we encounter SSL. Is there a way to have IIS serve up an SSL certificate from another server? In other words, is there a way to be a trusted man in the middle? I'm hoping that's possible so that we don't have to require all our clients to re-issue their SSL certs. Frankly, we don't want to have to manage hundreds of certs. I'd also like to avoid a UCC situation if there's a way to because it seems to require re-creating the cert each time a client is added. So, any pointers on proxying/hosting SSL (or even dynamic SSL hosting like http://www.globalsign.com/cloud/) would be appreciated.

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• IIS Messing on Wordpress Permalinks or WP's fault?

  - by Jesus Rodriguez

  Hello, I had a problem and after some research I discovered the exactly point where is failing. blog.domain.com Is not working, it says that the page cannot be found (404) blog.domain.com/index.php Working as expected If you click on Home, it will says that the page cannot be found, if you try to preview a new post, it says that the page cannot be found... I can see every post btw. I run my blog on a Windows hosting using IIS. my permalink is this: /index.php/%postname% IIRC I had to use index.php because my IIS doesn't have URL rewriting. I have no problem with the index.php thing on the url, I have now a good SEO and I don't want to change my permalink but I Don't know why is not working now... just from one day to the next... It's a problem of WP or is just my host messing up? If is my blog, do you know what is causing this? (Just for create a concrete ticket about the exactly problem) Thank you.

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• IIS running but not serving content

  - by Kyle

  I have an internal dev server running Windows 2k8 R2 with the Web and FTP Server roles set up which won't serve any content at all. Trying to connect from another host via telnet yields 'connection failed': c:\>telnet devserver 80 Connecting To devserver...Could not open connection to the host, on port 80: Conn ect failed Using netstat -an | find "80" on the dev server returns no connections on port 80 (a few on 1801, etc) tcpview confirms this, listing no open connections on port 80. The following services related to the Web role are running: World Wide Web Publishing Service Application Host Helper Service Microsoft FTP Service (ftp connections to port 21 are granted) Windows Process Activation Service The default website bindings are: Type Host Name Port IP Address Binding Information http 80 * net.tcp 808:* net.pipe * net.msmq localhost msmq.formatname localhost When setting up a new application under the default site, the test function passes both connection/authorisation only if the 'connect as' user is local admin, otherwise the test errors with 'invalid application path'. At no point is the W3SVC service PID bound to port 80 (it is running and bound to 21 for ftp). There are no W3SVC log directory at c:\inetpub\logs\LogFiles\ (only FTPSVC2), and no HTTPERR directory at c:\windows\system32\ or c:\windows\system32\logfiles\. There do not appear to be any related errors in the event logs. I'd really appreciate any thoughts on be a good place dig into what's (not) going on here!

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• IIS High use & Server Performance issues

  - by HaydnWVN

  Have an SBS2011 running Exchange, a database app and a few other things serving 5 users (3 low use, 1 high). The server was never specced for the database app so it isn't as powerful as I'd like... Only 12GB RAM. We have increasingly found performance problems with this server, last week it was so bad I couldn't even connect remotely. To free up some available RAM I have (over the past month or so): Restricted the Exchange Message Store to 1GB with (so far) no ill effects. Restricted SQL Databases (including SBSMonitoring and Sharepoint/##SSEE (Which isn't used)). Now I am finding that IIS Worker threads are using up the available memory and I have (so far) been unable to track down much useful information about restricting them. This server is not 'serving' anything web-based apart from OWA that I am finding people using because Outlook is so slow (again related to the Servers performance). I am aware that Exchange on SBS2011 is designed to use up available resources (and concede when other applications request). But it is not doing so (or anywhere near fast enough) for our needs. Opening the database application (using Postgres) takes 5+ minutes from client machines and regularly times out or crashes due to this. After a reboot (before SQL/Exchange/IIS databases are very large/totally cached) we get the performace we need and expect. Previously a reboot once a month was enough... Then once a week... Now they have taken to rebooting it almost daily!

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• Zero downtime uploads / Rollback in IIS

  - by NickatUship

  I'm not sure if this is the right way to ask this question, but here's basically what i'd like to do: 1.) Push a changeset to a site in IIS. 2.) Don't interrupt the users. 3.) Be able to roll back effortlessly. So, there are a few things that I know have to happen: 1.) Out of Proc session - handled 2.) Out of Proc cache - handled So the questions that remain: 1.) How do i keep from interrupting the users? If i just upload the files to bin, the app recycles and takes 10+ seconds to come back online 2.) How do i roll back effortlessly? I was thinking a possible solution would be to have two sites set up in IIS, one public and one private. Uploads go to private and get warmed up. After warmup, the sites are swapped. A rollback only entails swapping to private without an upload. This seems sound in theory, but Im not sure of the mechanics. Any ideas?

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• IIS 7.5 stops serving requests for no apparent reason

  - by Steffen

  We're running a site on 4 virtual Win 2008 R2 64 bit servers. This is the only site on the IIS, and we use Windows Network Load Balancing to share the load between our 4 virtual servers. We've used these virtual servers for approximately a week, and we're starting to see some issues. For no apparent reason the IIS stops serving pages, and doesn't even respond with an error. So upon requesting a page from the server, the browser just waits infinitely (or until it decides to give up clientside) Sometimes an iisreset fixes the issue, other times we have to reboot the entire virtual server. There are no traces in the eventlog of why this happens, and there's no traces in our applications exception log neither. Furthermore this happens even when there's a very small load on the server, so it doesn't seem to be because it's flooded with requests. So frankly I'm at a loss here - I have no idea where to start debugging this issue :-( I'm quite certain we never had these issues on our physical servers, however they were running Win 2003 32bit, so there are quite a few differences between them and the virtual ones. (Which obviously makes it difficult to tell what exactly causes this)

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• IIS Digest repeatedly asking for authentication

  - by David Budiac

  I have a development copy of an ASP.NET intranet site checked out and running on my local machine. We're using digest authentication to allow users to log in using their active directory accounts. On my development copy only, Digest sometimes will repeatedly prompt for login information usually ~9 times per page request. After repeatedly logging in (or it also works to cancel out of 8 out of the 9 prompts), I can use the site as normal. I cannot pinpoint what is triggering the issue. Sometimes this problem triggers upon the next page request, sometimes after I edited/saved/refreshed a page, and sometimes it doesn't happen at all. Each prompt triggers several logon (Event ID 4624 & 4672) security events in the Events Viewer. Shortly after each burst of logon events, I'll see a burst of logoff events (Event ID A co-worker who has a nearly an identical setup (Windows 7, IIS 7) is not experiencing the issue. Our production copy (that is running on a different server) also does not experience the issue. We've tried to compare our settings in IIS, not really finding any differences. I'm using chrome but I've experienced the issue in other browsers.

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• Tracking down the cause of a web service fault running in IIS

  - by BG100

  I have built a web service in Visual Studio 2008, and deployed it on IIS 7 running on Windows Server 2008 R2. It has been extensively tested, handles all errors gracefully and logs any uncaught errors to a file using log4net. The system normally runs perfectly, but occasionally (2 or 3 times a day) a fault occurs and screws up the application which needs an iisreset to get it working again. When the fault occurs I get some random errors that are caught by my catch-all error log, such as: Value cannot be null. Could not convert from type 'System.Boolean' to type 'System.DateTime'. Sequence contains no elements These errors are raised on every request until I manually do an iisreset, but there is no sight of them when the system is running normally. The web service is a stateless request-response application. Nothing is stored in the session. It could be load related, but I doubt it as there are only around 30 or 40 requests per minute. This is proving very tricky to track down. I can't work out what is putting IIS into this bad state, and why it needs an iisreset to get it working again. Nothing is reported in the event log. Can anyone suggest how to enable more extensive logging that might catch this fault? Also, does anyone know what might be causing the problem?

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