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IIS Support Blog

  • 416 Blog Articles
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481

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. ...
461

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...
1,343

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
1,011

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
875

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
715

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
647

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.
732

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...
687

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...
869

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...
644

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
1,001

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
624

INET_E_RESOURCE_NOT_FOUND error

Nedim on May 25 2021 01:26 PM
Can’t reach this page. There was a temporary DNS error. Error code: INET_E_RESOURCE_NOT_FOUND
593

417 Expectation Failed error

Nedim on May 25 2021 01:24 PM
417 status code refers to an issue with the Expect header in the request
486

Failed Request Tracing is not creating logs

Nedim on May 25 2021 01:22 PM
Things to do if Failed Request Tracing (FREB) doesn't create log files
473

Remove folder/application names from URLs

Nedim on May 25 2021 01:19 PM
How to remove folder name from a path like this: http://testsite.com/testapp/default.htm
511

Block an IP address accessing the application

Nedim on May 25 2021 01:17 PM
If you suspect a malicious activity, you can block the IP address in IIS
1,788

Collect memory dumps for a first-chance exception, when it occurs

Pingulea on Apr 16 2021 08:38 AM
Illustrated steps to take when we need to capture a first-chance exception with a memory dump, for analysis
903

Timeout Issue Caused by Idle Time-Out Action

Nedim on Mar 26 2021 11:01 AM
While navigating the pages in an application, the page was spinning for about a minute and giving a timeout error.
2,852

Keyset does not exist

Nedim on Mar 26 2021 10:59 AM
IIS may display “Keyset does not exist” error while trying to set application pool identity.
1,134

Application Request Routing is Missing in IIS Manager

Nedim on Mar 26 2021 10:58 AM
Even if you install Application Request Routing (ARR), it may not show up in IIS Manager
609

401 Custom Error Page Breaks Windows Authentication

Nedim on Mar 26 2021 10:54 AM
Using IIS Manager for adding a custom page for 401 status code may cause issues with Windows Authentication
832

The data is invalid error

Nedim on Mar 26 2021 10:53 AM
Event 7023: “The Windows Process Activation Service service terminated with the following error: The data is invalid.”

Latest Comments

kjstech
in Host Header Vulnerability on Jul 28 2021 10:38 AM
I also notice that in a local LAN environment this requires you to use the FQDN. On the domain you could typically go to https://servername and it would load. Now you must use the FQDN like https://servername.domain.com. Could the 301 permanant redirect handle switching to the FQDN for you? Instead ...
0 Likes
kjstech
in Host Header Vulnerability on Jul 28 2021 10:25 AM
This seems to eliminate the vulnerability from port 443 but my scanner is still showing it on port 80. While I could disable binding to port 80, we also use rewrite to redirect from 80 to 443. So I'm guessing the order in which this happens does matter?
0 Likes
KikeMarana
in Windows 10 Device Guard and Credential Guard Demystified on Jul 28 2021 08:30 AM
@Prpillai Is it possible to repair the broken images? I cannot see from anywhere.Thanks in advance!
0 Likes
dirtydeveloper
in Solution for “Request Entity Too Large” error on Jul 13 2021 06:35 AM
@KevinP_SBS I disagree; your message is specific to viewstate, mine was in a Web API app which means viewstate is irrelevant; we knew what size we wanted to limit for requests, and if you read my post, nor have I advocated setting huge buffer sizes.My solution allows people to set a fixed size for a...
0 Likes
Avinash07
in Basic Steps for Making a Process Monitor (ProcMon) Capture on Jul 12 2021 04:41 AM
@Jawahar Ganesh S , can procmon instance be run to capture only a particular process, ex-w3wp.exe without a user being logged in, like from Windows Task scheduler at a specific time? I understand that one can setup a task to run the procmon at a particular time, could you highlight if any arguments ...
0 Likes