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IIS Support Blog
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428

Capturing dotnet trace for app service

Meghali on May 19 2022 06:54 AM
Recently I was involved in troubleshooting a bot case where a system.net call from the bot was failing. We wanted to gra...
586

Direct Line App Service extension disconnect issues

Ramchandra_Kudtarkar on Apr 26 2022 02:20 PM
Direct Line App Service extension is getting disconnected without any reason, or after the process restart or configurat...
978

How to remove a HTTP module using PowerShell in IIS

trevorchamblee on Mar 09 2022 03:08 PM
This article will assist you to remove a module from IIS that is causing IIS to fail starting W3WP.EXE when the module i...
1,312

ASP.NET Thread Usage on IIS 7.5, IIS 7.0, and IIS 6.0

Archi_Chakraborty on Feb 23 2022 07:30 PM
ASP.NET Thread Usage on IIS 7.5, IIS 7.0, and IIS 6.0
1,267

Users get intermittent credential prompt on client browser when using IIS Windows Authentication

Jason Xu on Jan 27 2022 09:56 AM
Users get intermittent credential prompt on client browser when using IIS Windows Authentication, after Domain Controlle...
2,182

Object identifier does not represent a valid object

Nedim on Dec 14 2021 04:51 PM
IIS Manager may display this error while starting a website: “The object identifier does not represent a valid object”
6,985

DefaultAzureCredential failed to retrieve a token

Nedim on Dec 14 2021 04:50 PM
If you try to retrieve a value from Azure Key Vault, you may run into this error: “DefaultAzureCredential failed to retr...
3,696

Connection closed by remote host

Nedim on Dec 14 2021 04:48 PM
You may run into this error message when you try to connect an FTP site in Command Prompt: “Connection closed by remote ...
1,023

Status Code 400.0.64

Nedim on Dec 14 2021 04:46 PM
Code 64 refers to “The specified network name is no longer available”
944

Invalid Content-Length

Nedim on Dec 14 2021 04:43 PM
“Invalid Content-Length” and “Server sends too much data” errors
2,012

Cannot use prefix with empty namespace URI

Nedim on Jul 29 2021 02:24 PM
This error message may show up if you try to change an IIS setting: There was an error while performing this operation. ...
2,413

Kernel-mode and user-mode caching

Nedim on Jul 29 2021 02:13 PM
After enabling output caching (refers to both kernel-mode and user-mode) in IIS, you may want to make sure resources are...
4,535

Memory dumps to study a high-CPU performance issue

Pingulea on Jul 23 2021 08:57 AM
Series of dumps from a process instance to study why it consumes CPU
2,915

Memory dumps to study a memory-leak performance issue

Pingulea on Jul 23 2021 08:53 AM
Series of dumps from a process instance to study why memory leaks
2,502

Memory dumps for hang or performance issues, "automated" approach

Pingulea on Jul 23 2021 08:44 AM
Collect series of dumps to study why IIS slowness
2,510

Memory dumps for hang or performance issues, "manual" approach

Pingulea on Jul 23 2021 08:41 AM
Collect series of dumps to study why IIS slowness
1,686

Memory dumps at process termination, with optional first-chance dump

Pingulea on Jul 23 2021 08:32 AM
We may have some first-chance exceptions building up the “right” context for a second-chance exception to occur.
3,956

IIS Admin Service unable to start - How and Why it can happen?

ashfana on Jul 02 2021 09:59 PM
We often come across issue where IIS admin service fails to start with multiple error codes and often error codes points...
2,907

401 1 2148074248 in IIS logs behind a load balancer with multiple servers

MattHamrick on Jul 01 2021 12:07 PM
If you're receiving an unexpected 401 and IIS logs show this: 401 1 2148074248, this blog could be useful if you have th...
4,528

403.16 error : "Root certificate which is not trusted by the trust provider. (0x800b0109)"

Malathi_Pai on Jun 16 2021 09:15 AM
A certificate chain processed, but terminated in a root certificate which is not trusted by the trust provider. (0x800b0...
1,255

Event ID 2269 (HTTP.SYS communication error)

Nedim on May 25 2021 01:30 PM
The worker process for app pool 'DefaultAppPool' failed to initialize the http.sys communication
2,998

BREACH vulnerability

Nedim on May 25 2021 01:27 PM
BREACH attack works by trying to guess the secret keys in a compressed and encrypted response

Latest Comments

MattHamrick
in Capturing dotnet trace for app service on May 19 2022 08:58 AM
great post! Thanks for the writeup!
0 Likes
MattHamrick
in Setting up Kerberos Authentication for a Website in IIS on May 17 2022 08:42 AM
It's worth noting here that BOTH of these settings should be true for ideal performance: useAppPoolCredentials useKernelMode When useKernelMode is disabled, client credentials are passed up to the IIS worker process where the app pool account will be used, so it does not matter what useAppPoolCreden...
1 Likes
karl_sg
in Centralized Certificate Store (CCS) and IIS bindings on Apr 28 2022 04:10 AM
Hi Lance,yes, you have to enable it on each webserver. In our automation process we added this just before the snippet I posted previously:Write-Host "Enabling Central Cert Provider" Set-WebCentralCertProvider -UserName "$saUsername" -Password "$saPassword" -PrivateKeyPassword "$certPass" where "saU...
0 Likes
LanceLyons
in Centralized Certificate Store (CCS) and IIS bindings on Apr 27 2022 02:43 PM
Thanks for the write up. I am wondering if you have to add Centralized Cert support (CCS) to every webserver that uses this in a web farmtoday we have ssl termination on the f5 loadbalancers. We are looking at using the centralized cert store (CCS) and have that setup on 2 webservers in a farm but i...
0 Likes
PCDevOps77
in HTTP response 503 Service Unavailable from IIS: one common generic cause on Apr 19 2022 02:18 AM
very good article.Very well explainedThanks
0 Likes