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SSRS server not available 503 error

Farheen Qureshi 0 Reputation points
2026-04-08T14:20:02.13+00:00

Hi Team,

I have configured SQL Server Reporting Services (SSRS) and integrated it with MS SQL Server. The setup was working fine for the past few months; however, currently, we are facing an issue while accessing the report server.

Error Details:

  • HTTP Error 503 – Service Unavailable

URL: http://ctpu-374/ReportServer

Observation:

The report server is not accessible via browser and shows a service unavailable message.

This issue started recently after a few months of stable operation.

Request: Kindly assist in identifying the root cause of this issue. Possible areas we suspect include:

SSRS service not running or failing to start

Service account or credential-related issues

ReportServer database connectivity problems

Configuration or URL binding issues

Please guide us with the necessary troubleshooting steps and resolution.

Regards, [Your Name]Hi Team,

I have configured SQL Server Reporting Services (SSRS) and integrated it with MS SQL Server. The setup was working fine for the past few months; however, currently, we are facing an issue while accessing the report server.

Error Details:

HTTP Error 503 – Service Unavailable

URL: http://ctpu-374/ReportServer

Observation:

The report server is not accessible via browser and shows a service unavailable message.

This issue started recently after a few months of stable operation.

Image (9) (1).jpg

SQL Server Reporting Services
SQL Server Reporting Services

A SQL Server technology that supports the creation, management, and delivery of both traditional, paper-oriented reports and interactive, web-based reports.

Answer recommended by moderator

Lakshmi Narayana Garikapati 1,330 Reputation points Microsoft External Staff Moderator
2026-04-10T10:00:24.4966667+00:00

Hi Farheen Qureshi, Thanks for reaching out to the SQL Q&A forum.

The error HTTP 503 – Service Unavailable on your SSRS URL (http://ctpu-374/ReportServer) usually indicates that the Reporting Services service isn’t running or failed to start. Since your setup was stable for months, here are the key areas to check:

SSRS Service Status

  • Open Services.msc and confirm that SQL Server Reporting Services (MSSQLSERVER) (or your named instance) is running.
  • If it fails to start, review the Windows Event Viewer → Application/System logs for startup errors.
  • Service Account & Credentials
  • Verify the SSRS service account is active (not locked, expired, or with a changed password).
  • If the password was updated, re‑enter it under Services → Log On tab.
  • Ensure the account has permissions on the ReportServer database.

Database Connectivity

  • Connect to ReportServer and ReportServerTempDB in SSMS.
  • Run a simple query (e.g., SELECT TOP 1 * FROM ReportServer.dbo.Catalog) to confirm connectivity.
  • If connection fails, check SQL Server service status, authentication mode, and firewall rules.
  • URL Reservations & Bindings
  • Run netsh http show urlacl to confirm the reservation for http://ctpu-374/ReportServer.
  • In Reporting Services Configuration Manager → Web Service URL, verify bindings are correct.
  • Ensure no other service (like IIS) is conflicting on port 80.

SSRS Logs

  • Check logs at:
  • C:\Program Files\Microsoft SQL Server\MSRSXX.MSSQLSERVER\Reporting Services\LogFiles

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  1. AI answer

    2026-04-08T14:20:17.82+00:00

    For an SSRS instance that was working and now returns HTTP 503, focus on service state, database connectivity, and configuration.

    1. Verify SSRS service and Windows logs
    • On the SSRS server, open Services and confirm that SQL Server Reporting Services (MSSQLSERVER or named instance) is running.
    • If it is stopped or repeatedly stopping, check Windows Event Viewer → System for Service Control Manager errors similar to Event ID 7031 indicating the SSRS service terminated unexpectedly. This pattern matches the scenario described where ReportingServicesService.exe crashes and causes HTTP 503.
    1. Apply the relevant cumulative update / hotfix
    • For SQL Server 2008 R2, a known issue causes HTTP 503 and SSRS service crashes when executing reports; the fix is included starting with Cumulative Update 3 and in all later builds.
    • For SQL Server 2016, a known issue after upgrading SSRS to 2016 causes HTTP 503 when opening the web portal; the fix is in Cumulative Update 1 for SQL Server 2016 and later cumulative updates.
    • Install the latest cumulative update for the SSRS version in use so that all known HTTP 503-related fixes are applied.
    1. Confirm ReportServer database connectivity and credentials
    • Open Reporting Services Configuration Manager and connect to the instance.
    • Go to Database and verify the ReportServer and ReportServerTempDB databases are reachable.
    • Use Change Credentials, re-enter the existing service account or SQL login, apply the settings, and restart the SSRS service. This step re-establishes the secure connection to the ReportServer database if credentials or security context were disrupted.
    1. Validate URL configuration and bindings
    • In Reporting Services Configuration Manager, check Web Service URL and Web Portal URL:
      • Ensure the URL reservations exist and match the host and port being used (for example, http://ctpu-374/ReportServer).
      • If TLS/SSL or host headers were changed, remove URL reservations and TLS bindings in the order documented (remove URL reservations, then TLS bindings, then recreate URLs and bindings) and test again.
    1. Check clustered/remote SQL Server scenarios
    • If the ReportServer databases are on a virtual SQL Server in a Microsoft Cluster Services (MSCS) cluster and the SSRS service account is NetworkService or another account that relies on the <domain>\\<computer_name>$ login, ensure that login exists and has access to the ReportServer databases. Otherwise, use an explicit domain account or SQL login for the report server database connection.

    After these steps, if the SSRS service remains stable (no repeated crashes in Event Viewer) and the ReportServer database connection is valid, the HTTP 503 error should be resolved and the http://ctpu-374/ReportServer URL should become accessible again.

    References:

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