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IIS Support Blog
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689

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”
1,231

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...
884

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 ...
506

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”
434

Invalid Content-Length

Nedim on Dec 14 2021 04:43 PM
“Invalid Content-Length” and “Server sends too much data” errors
1,564

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. ...
1,795

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...
3,028

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
2,170

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
1,822

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
1,828

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
1,280

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.
2,060

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...
1,793

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...
2,885

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...
933

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
2,082

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
2,610

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
1,558

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
792

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
1,214

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
2,940

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

Latest Comments

Wizard17
in Windows 10 Device Guard and Credential Guard Demystified on Jan 19 2022 03:04 PM
Hi Priyanka PillaiNice write up. One question I just cannot find an answer to anywhere is:Before WDCG there was LSA Protection. Would it be an extra layer of "cumbersomeness" added for an adversary to enable that on top of WDCG, or would it just make no sense and add nothing since creds are not in t...
0 Likes
Frankie1969
in Certificate is missing in IIS binding window on Jan 15 2022 01:28 AM
thumbprint is certificate serial number.If you can see the certificate in the Computer/Personal certificate store, double click on it, the details contain serial number.
0 Likes
joe .
in How to use SPNs when you configure Web applications that are hosted on Internet Information Services on Jan 13 2022 01:06 PM
So now that AD blocks trying to duplicate SPNs (not that it ever should have worked properly before if Kerberos is working properly since SPNs were always supposed to be unique for exact lookups of security principals by SPNs) what is the new guidance for the stuff described up in the area where thi...
0 Likes
digitalmonk
in ARR authenticating itself to backend with client certificate on re-routing requests on Jan 12 2022 11:30 AM
I am trying to use IIS with ARR to proxy to a REST API which enforces client authentication (2-way SSL). I have tried using an exported PFX file & a hash from the certificate store, ensuring that IIS_IUSRS had access to both. I receive a 500.19 error with the the following error in the trace: Cannot...
0 Likes
gerardt1961
in The request is not supported (0x80070032) on Dec 28 2021 10:21 AM
Unfortunately this did not solve my problem. I cant even install the update manually.
0 Likes