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How to Troubleshoot Intermittent SSRS Windows Authentication Prompts

Khadija Khan Oct 1, 2026 868 views

Question details

Users are continuously prompted for SSRS credentials despite having correct Windows NTLM authentication and Active Directory group permissions.

How to Troubleshoot Intermittent SSRS Windows Authentication Prompts

Product: SQL Server Reporting Services (SSRS)
Device & OS: not provided
Scenario: Accessing SSRS reports over a network using Windows credentials.
Observed behavior: Users experience intermittent pop-up prompts requesting their username and password instead of being logged in automatically via single sign-on (SSO).

Before you start

Ensure you have administrative access to the SSRS server, DNS manager, and Active Directory settings before modifying authentication protocols or SPN configurations.

Solution 1Recommended

Verify SPN and SSRS Authentication Configurations

Properly configured Service Principal Names (SPN) and supported authentication types in the SSRS config file are critical for preventing credential loop prompts.

If Kerberos delegation or NTLM is misconfigured, the report server will fall back to prompting the user. Validating the SPN ensures the HTTP service is correctly mapped to the SSRS service account.

Check the SSRS Configuration File

Navigate to the Report Server installation folder, open the rsreportserver.config file in a text editor as Administrator, and ensure the <AuthenticationTypes> section includes both RSWindowsNegotiate and RSWindowsNTLM.

Validate SPN Mappings

Open Command Prompt as Administrator and run the command 'setspn -L <ServiceAccountName>' to verify that the HTTP SPN correctly matches the SSRS service account.

Review Authentication Logs

Open the Windows Event Viewer on the SSRS server, navigate to Security Logs, and compare successful and failed logon attempts to identify kerberos token size limits or SPN mismatches.

Verify SPN and SSRS Authentication Configurations

Active Directory Token Size: If the affected users are members of numerous Active Directory groups, their Kerberos token size may exceed the HTTP request limit. You may need to increase the MaxFieldLength and MaxRequestBytes registry keys on the server.

Solution 2

Add the SSRS URL to the Local Intranet Zone

Browsers may block automatic credential pass-through if they recognize the SSRS server as an external internet site rather than a trusted local intranet resource.

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Frequently Asked Questions

Why does SSRS keep asking for a password when using Windows Authentication?

This typically occurs due to missing Service Principal Names (SPNs), incorrect DNS routing, or because the SSRS URL has not been added to the browser's Local Intranet security zone, which prevents seamless NTLM or Kerberos pass-through.

How can I check if my SSRS server is attempting Kerberos or NTLM?

Open the rsreportserver.config file located in your report server's installation directory. Look at the <AuthenticationTypes> section. If 'RSWindowsNegotiate' is listed first, the server attempts Kerberos authentication and falls back to NTLM if it fails.

Can Active Directory group membership cause intermittent SSRS authentication prompts?

Yes. If users belong to a large number of Active Directory groups, their Kerberos authentication token can exceed the default HTTP request size limit on the server. This causes the server to reject the automated token and prompt the user for credentials.

Does WPS Office support opening data reports exported from SSRS?

Yes, WPS Spreadsheets natively supports standard .xls and .xlsx formats, allowing you to open, filter, and format any spreadsheet report exported directly from SQL Server Reporting Services.

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