Cannot delete spn

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Cannot delete spn

Service Principal Names are already in use for every computer and user account. Service Principal Names are not always necessary. Again, using the SQL Server as an example, once the SQL instance is established, a web application that uses the databases in the instance may point directly at the server. In that case, an SPN is not required, because there is no confusion about where the authentication is going to take place or where the service is located.

However, in some cases you do not reference the SQL Server by direct name. In many cases, web applications running on IIS 7. Bear with me as I start off with the basics; by the end of the post it will all be very clear.

No SPNs have been set yet. Active directory user and computer accounts are objects in the active directory database. These objects have attributes. He gives the ticket to the client. The client goes to the SQL service on sql1. The SQL service will attempt to read the ticket. The problem is, the SQL service is not running under the computer account; it is running under a domain service account. It can not read the ticket; the ticket is only intended for the computer account of sql1.

Authentication fails falls backto NTLM. Obviously this is heavily paraphrased but hopefully it helps you understand the reason for setting the SPN attribute on the account that runs a given service. Here are the most common switches used with SetSPN:. If in your domain environment you have computers and users that share account names, then you will want to use the —u switch to modify user accounts. Open the Service Account properties and goto the Delegation tab.

You should be able to see enterprises here if everything is setup correctly. If SPN is not registering even though a command prompt query says its there. Click Users or Computer and add the same user account. I know this sounds silly, because you are adding the account to itselfbut this way it can see if the SPNs that are registered to the account and will show the available services automatically.

SPNs should be unique within the domain. This goes for the SPN being set on multiple computers, multiple users; it will also not function properly if there is both a user and a computer account that have the same SPN. You can search for SPNs in the domain by using the —q switch. This will tell you if there is already an account that is using that SPN.

For example:. And if you need to troubleshoot a problem with an SPN, a good place to start is by verifying that there are no duplicate entries:.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I'm not sure how to move forward from here. Googling around hasn't turned out the right answer. Please help. The questions are:.

Ensure you are running the script from a machine joined to the Active Directory domain and the machine's DNS is resolving to AD correctly. The SPN Script is also wrong. Get rid of the quotation marks, they're not needed in this context, especially given that there are no embedded spaces to enclose.

Ensure you are logged into the internal domain in order to run the first command. I just tested the second line in my environment and it worked. I don't need to obfuscate my test environment, so it actually was the following:. It should be internal. As a result, the misplaced SPN as identified by Kerberos Configuration Manager is not the root cause of the initial error message: The target principal name is incorrect.

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Microsoft SQL Server. The solution to the initial problem came from this postwhere several steps are performed on both the client and server side to resolve the issue.

Learn more. Asked 3 years, 2 months ago. Active 3 years, 2 months ago.

cannot delete spn

Viewed 8k times. The questions are: 1 Is the misplaced SPN the culprit? If so, how to correct? Zhang18 Zhang18 3, 5 5 gold badges 38 38 silver badges 57 57 bronze badges. Do you have problem to access by using SQL login?

Wendy Accessing locally is fine. I installed SSMS on the server itself and that works. Login failed for user 'xxx'. If you're able to get in. Sorry, can't help you much. Remotely both SQL and Windows authentication are failed. Please check a.

Windows event logs and SQL log more information. Active Oldest Votes. T-Heron T-Heron 4, 7 7 gold badges 20 20 silver badges 42 42 bronze badges. The comma was a typo, corrected. I removed part of the domain name obfuscation.This content is written by a Microsoft customer support engineer, and is intended for experienced administrators and systems architects who are looking for deeper technical explanations of features and solutions in Windows Server R2 than topics on TechNet usually provide.

However, it has not undergone the same editing passes, so some of the language may seem less polished than what is typically found on TechNet. This includes if the restoration or reanimation of a deleted object or the renaming of an object would result in a duplicate.

Error codes or or their hex, symbolic or string equivalents are logged in various on-screen dialogues and in event ID in the Directory Services event log. The user logon name you have chosen is already in use in this enterprise. Choose another logon name, and then try again. The specified user logon name already exists in the enterprise. Specify a new one, either by changing the prefix or selecting a different suffix from the list. An attempt to create a new user in Active Directory Administrative Center with a UPN that already exists will yield the following error.

The event lists the value that was blocked and a list of one or more objects up to 10 that already contain that value. In the following figure, you can see that UPN attribute value dhunt blue.

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You can bypass the duplicate SPN detection by using the "-A" option however. The error message displayed is the same as the one displayed when using the -S option: "Duplicate SPN found, aborting operation! If the object needs to be restored, you will need remove the duplicate UPNs from the other objects.

If there are multiple objects with duplicates, then Windows PowerShell might be the better tool to use. The userPrincipalName attribute is single-valued attribute, so this procedure will only remove the duplicate UPN. Offbox call desirable but not critical, i. If a duplicate is found, the request fails. The requisite attribute modifications against which this path is triggered are:. If any of the new SPN value is a duplicate, we fail the modification.

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This is the first of several " Try This " activities in the module. There is not a separate lab guide for this module. The Try This activities are essentially free-form activities that allow you explore the lesson material in the lab environment. You have the option of following the prompt or going off script and come up with your own activity.

Do the same for a SPN on another account. If so, move on to the next step. Imagine you have just been presented with the error you see in the previous step.

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See the workbook for example steps. Submit and view feedback for. Skip to main content. Contents Exit focus mode. Note The userPrincipalName attribute is single-valued attribute, so this procedure will only remove the duplicate UPN. Note This is the first of several " Try This " activities. While not all sections have a Try This prompt, you are still encouraged to explore the lesson content in the lab where appropriate.Skip to main content.

Update Available. Select Product Version. All Products. This article describes some issues that occur on a Windows Server R2-based domain controller.

cannot delete spn

A hotfix is available to resolve these issues. Assume that you have a domain controller that is running Windows Server R2, you may encounter one of the following issues. The same computer host name is already used in another domain. In this situation, the domain join operation reports success. The security database on the server does not have a computer account for this workstation trust relationship.

It successfully prevents duplicate SPN and UPN when they are driven through administrative tools without requiring the tool to perform a uniqueness check itself. In the issues that were described in this article, it prevents administrative tasks where the effect is not obvious. In some cases, you can delete the objects that block your action so that the action is successful.

Such a preparation change might not be possible in all cases. Therefore, Microsoft has developed an update that enables controlling the domain controller behavior.

This update applies to Windows Server R2-based domain controllers. You can also install this update on member servers that are candidate for promotion to a domain controller in the future. With this update, Microsoft provides a forest level switch to turn off or turn on uniqueness check through the dSHeuristics attribute. We recommend that you set the value back to 0 when you know problematic changes are not occurring any longer.

This can be the case especially for intra-forest migrations. Hotfix information Important If you install a language pack after you install this hotfix, you must reinstall this hotfix. Therefore, we recommend that you install any language packs that you need before you install this hotfix. For more information, see Add language packs to Windows. A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article.

Apply this hotfix only to systems that are experiencing this specific problem. If the hotfix is available for download, there is a "Hotfix Download Available" section at the top of this Knowledge Base article.

cannot delete spn

If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix. Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request.

The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. File information.

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Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. More Information. See the terminology that Microsoft uses to describe software updates. Last Updated: Sep 6, You have probably heard of Silver Ticket attacks and you are probably thinking that this problem was patched ages ago. Well, think again.

cannot delete spn

In this post, I will demonstrate the dangers of SPN and how they can be misused in what is called a Silver Ticket attack. In the first part of my blogpost, I will show how you can use this to attack an infrastructure and in the other part, I will provide tips on how to mitigate risks.

A Silver Ticket attack requires that the attacker have access to the domain with an account.

Event 11 and how to remove duplicate SPN’s

The account can be an ordinary domain account. In this blogpost, I will be logged onto my lab computer that is joined to my lab domain with an ordinary user. All the tools will be installed directly on to the machine. In my lab, I am running a Windows 7 X64 as a workstation and the domain controller is a R2 Server.

Now you are all set to start the attack. First, we need to identify if there is something interesting to attack in the domain. We are not looking for all SPNs, just the ones that links to a service or a user account. Why is that? It is more likely that either a service or a user account has a weak password.

I use a variation of commands to find the ones I want to crack. I often list all SPNs to a text file and copy out the ones that are user accounts. Computer accounts are not interesting. Either way you should pick out the ones, you want to try to crack.

In my lab I have found the following SPN that is interesting:. Now we need to start Wireshark to capture the traffic. After Wireshark capture has started, you will need to run the following two commands in Powershell:. Add-Type -AssemblyName System. IdentityModel New-Object System. This will contact the domain controller and request a kerberos ticket. The current kerberos tickets on the system can be listed with the klist command.

Run it to verify that the ticket is in the system.At times, we may require to remove a wrongly created SPN entry. The syntax for removing a SPN entry is:. Over the weekend, I was working on my lab to simulate an issue, while I observed that the SPN registration was failing on one of my test server.

To fix the issue, I had to remove the SPN entry. You are commenting using your WordPress. You are commenting using your Google account. You are commenting using your Twitter account. You are commenting using your Facebook account. Notify me of new comments via email. Notify me of new posts via email. Enter your email address to subscribe to this blog and receive notifications of new posts by email. Sign me up!

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List all SPNs used in your Active Directory

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KB How to report the group policy settings that are in effect for the local computer? KB How to specify the license type to use when joining the server to AD using adjoin? Version Published on. Applies to: All versions of Centrify DirectControl on all platforms. Error: One or more of the following SPNs already associated with other account in the forest.

Each SPN must be unique across the forest. Please make sure the SPNs listed above are unique across the forest before joining. Join to domain 'intra. The following message may be seen in the centrifydc. Run adinfo --diag to check for multiple computer accounts with the same SPN. Check that the local computer's Active Directory object's servicePrincipalName value has not been deleted.

Check for replication errors. Feedback: Use this form to send us your feedback or report problems you experienced with this knowledge article. This form will not help you receive technical support. Still have questions? Click here to log a technical support caseor collaborate with your peers in Centrify's Online Community. Rate This Article.


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