How to fix Error 7827 on Windows Server 2025 / Windows 11

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Troubleshooting Guide: SQL Server Error 7827 – HTTP Namespace Reservation Permission Denied

Why This Error Happens

Error 7827 occurs when the SQL Server service account lacks the necessary Windows-level permissions to reserve or unreserve HTTP namespaces using HTTP.sys, which is required for features like SQL Server Reporting Services endpoints or native HTTP SOAP access. This typically happens because the URL ACL reservation was never created, was created under a different account, or the current account does not have administrative rights to modify the HTTP namespace table. It can also occur if the HTTP Service (HTTP.sys) configuration store has become corrupted or out of sync after a Windows Server 2025 or Windows 11 update.

Step-by-Step Resolution Guide

Step 1: Verify the Current User/Service Account Permissions

  • Open an elevated Command Prompt (Run as Administrator) on the Windows Server 2025 / Windows 11 machine.
  • Run whoami /groups to confirm the executing account belongs to the local Administrators group or has been explicitly granted namespace rights.
  • Identify the exact SQL Server service account via services.msc > SQL Server (MSSQLSERVER) > Log On tab.

Step 2: Manually Reserve the URL ACL Using netsh

  • Run the following command, replacing the account and URL with your specific configuration:
  • netsh http add urlacl url=http://+:80/ user=DOMAIN\SQLServiceAccount
  • If the reservation already exists under the wrong user, delete it first: netsh http delete urlacl url=http://+:80/
  • Confirm the new reservation was applied: netsh http show urlacl

Step 3: Grant Explicit Registry and Service Permissions

  • Open regedit and navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\HTTP\Parameters.
  • Right-click the Parameters key, select Permissions, and ensure the SQL Server service account has Read and Query Value access.
  • Restart the HTTP service dependency chain by running net stop http followed by net start http (note: this may require stopping dependent services like W3SVC first).

Step 4: Restart SQL Server Services and Apply Changes

  • Open SQL Server Configuration Manager.
  • Right-click the SQL Server instance and select Restart to reload the HTTP.sys bindings with the new ACL permissions.
  • Re-run the original T-SQL command or endpoint creation script that triggered Error 7827.

Alternative or Verification Steps

  • To verify the fix, re-run netsh http show urlacl url=http://+:80/ and confirm the correct service account is listed with Listen permissions enabled.
  • If the error persists, reset the HTTP.sys driver entirely using netsh http flush logbuffer and reboot the server, as a corrupted namespace table can sometimes require a full driver-level refresh rather than a simple service restart.