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IIS Support Blog
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1,356

Underpinnings of Bot analytics

mertozturk on Nov 12 2020 11:33 PM
Is your bot analytics blade showing unexpected information. You should read this article!
10.8K

Duplicate collection entry of type (0x800700b7)

Nedim on Nov 04 2020 06:15 PM
Error after enabling FREB: "Cannot add duplicate collection entry of type ‘add’ with unique key attribute ‘path’ set to ...
7,534

CLSID failed (800700b7)

Nedim on Nov 04 2020 06:12 PM
If IIS Manager doesn’t open because of the error below, it may cause delays in maintenance and migrations.
5,930

W3C Logging Service failure (ID 6005)

Nedim on Nov 04 2020 06:11 PM
In some cases, Event Viewer may display “W3C Logging Service failed to connect to the pipe server” error after applicati...
5,623

Unexpected end of file has occurred

Nedim on Oct 30 2020 01:51 PM
If there is something wrong with the IIS config file, IIS Manager may crash with this error
3,307

AspNetInitClrHostFailureModule (0x80131704 – 2148734724)

Nedim on Oct 30 2020 01:48 PM
While troubleshooting a 500 error, Failed Request Tracing (FREB) may display AspNetInitClrHostFailureModule error with 0...
3,342

Enabling Bot Telemetry for Application Insights

mertozturk on Oct 27 2020 05:36 AM
Do you really now, what you will get by enabling the new Bot Telemetry Logger?
1,866

How bots work

mertozturk on Oct 27 2020 01:23 AM
A brief introduction to Bot Framework SDK 
242K

HTTP response 503 Service Unavailable from IIS: one common generic cause

Pingulea on Sep 28 2020 06:07 AM
WAS turns off the Application Pool due to repeated crashing exceptions in the Web application. Look for the exception ca...
3,129

ANCM not reading “ASPNETCORE_ENVIRONMENT” variable from local environment.

Ramchandra_Kudtarkar on Sep 11 2020 01:17 PM
After upgrading the asp.net core application to asp.net core 3.1 version, application is not able to read the “ASPNETCOR...
50.4K

Checking the certificate trust chain for an HTTPS endpoint

Pingulea on Sep 07 2020 04:14 AM
Check the trust when the client doesn't handshake the TLS with the server
37.5K

The request is not supported (0x80070032)

Nedim on Aug 24 2020 06:53 AM
IIS uses bindings to determine where to redirect requests. These bindings can be secured (https – mostly on port 443) or...
25.5K

MachineKeys folder fills up quickly

Nedim on Aug 24 2020 06:38 AM
MachineKeys folder stores certificate keys that are used by IIS. This folder my fill up with thousands of files in a sho...
4,260

Custom Error Page vulnerability

Nedim on Aug 24 2020 06:37 AM
IIS comes with default error pages. In order to help troubleshooting issues, these error pages may provide detailed info...
25.4K

Web.config file maximum size and count

Nedim on Aug 24 2020 06:32 AM
IIS refuses to read web.config if it exceeds a threshold. This check is in place to prevent vulnerability attacks
3,977

Bad method token error

Nedim on Aug 24 2020 06:28 AM
There is a known issue with 4.5.17 and lower versions that cause "Bad method token" error
3,942

Checking the FTP Sub status logged can help find the cause of problems.

michno on Aug 11 2020 10:21 AM
Did you know that there is a sub status field in FTP logs? Like the IIS web site log, the sub status can be very helpful...
45.1K

Event ID 7023: The Windows Process Activation Service terminated

Nedim on Aug 07 2020 04:20 PM
If your web applications stop responding requests, WAS is one of the services you should check first. While troubleshoot...
12.6K

Web Deploy issue ERROR_CONNECTION_TERMINATED

Nedim on Aug 07 2020 04:18 PM
While publishing an application from Visual Studio to Azure App Service, you may come across this error message.
8,438

Timer_MinBytesPerSecond in HTTP.SYS logs

Nedim on Aug 07 2020 04:16 PM
In a slowness issue I worked on, this record in HTTPERR file took my attention: Timer_MinBytesPerSecond
7,557

Set up a public page in Windows Authentication protected website

Nedim on Aug 07 2020 04:12 PM
If all of the pages in your website is protected by Windows Authentication, use the configuration to enable public acces...
10.5K

Nuget package for System.Net.Http on .NET Framework 4.7.2

Nedim on Aug 07 2020 04:09 PM
Application with a dependency to the System.Net.Http Nuget package may break after upgrading .NET Framework version to 4...
23.9K

The missing Server Hello in TLS handshake

Nedim on Aug 07 2020 04:07 PM
If the server is not sending Server Hello package, the communication won’t be established and the customer is likely to ...
6,036

Crash at System.Web.LegacyAspNetSynchronizationContext.CallCallback

Jason Xu on Jul 21 2020 10:37 AM
If you see crash at the following call stack, that mostly probably is because web application is currently configured to...
87.2K

HTTP OPTIONS and Default page vulnerabilities

Nedim on Jul 05 2020 12:46 PM
Simple ways for fixing HTTP OPTIONS and Default page vulnerabilities
6,529

Difference between SignalR unit and instance and SignalR pricing

Nedim on Jul 05 2020 12:42 PM
Explaining the SignalR components and pricing model might be confusing for Azure users who are discovering this service.
61.2K

Certificate is missing in IIS binding window

Nedim on Jul 05 2020 12:37 PM
If you add a certificate to Server Certificates in IIS but you don’t see it in the binding window, there are two things ...
5,911

Perfview Command for Capturing Automated High CPU Dumps

Prpillai on Jul 01 2020 03:42 AM
Perfview Command for Capturing Automated High CPU Dumps

Latest Comments

mhaslhofer
in ConfigurationErrorsException due to targetFramework mismatch on Apr 07 2024 02:11 AM
Thanks mate!This post helped us yesterday evening, during a web-server migration to Windows Server 2022.It's still an issue as of April 2024.(Repair did not work for us - we added the necessary Registry keys manually)
0 Likes
Georgiana27
in Reading a FREB log, a Failed Request Tracing: IIS request processing pipeline execution on Mar 08 2024 11:37 AM
Excellent. And we have even a better tool to read the FREB here NL-Cristi/FrebSbS: WindowsForms app for analyzing FREB traces from IIS (github.com)
1 Likes
JohnBfromDE
in Reading a FREB log, a Failed Request Tracing: IIS request processing pipeline execution on Mar 05 2024 06:33 AM
The PS Script from @DK1 is really useful. Without it, examining the logs is painful. I wrapped it with a PS foreach to do a bulk convert, then could easily share the results with team members tracking down a difficult slowness issue. Now if only we understood why many of the XML files seem to trunca...
1 Likes
abnerssantana
in Solution for “Request Entity Too Large” error on Feb 23 2024 09:38 AM
Thanks!
0 Likes
bphillus
in FTP “530 User cannot log in” error and solution on Feb 20 2024 07:27 AM
for those that still get the 503 error after setting all the correct permissions (IIS FTP Authentication=basic, IIS FTP Authorization=allow access to user, Windows File permissions, and FTP isolation rules), you MUST restart the FTP site in order for the changes to the IIS FTP Authentication, Author...
0 Likes