Error 503 Service Unavailable when you browse Windows SBS websites

Article ID: 2619402 - View products that this article applies to.
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SYMPTOMS

When you try to connect to Outlook Web Access, Remote Web Workplace, Companyweb, or any similar web applications, the site fails to load, and you receive the following error message:
HTTP Error 503. The Service is unavailable.
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2619399

RESOLUTION

Generally, this error occurs if the application pool that is associated with the web application doesn't start. To troubleshoot this issue, follow these steps:
  1. In Event Viewer, view the System log to find errors from the Microsoft-Windows-WAS source. An event is frequently logged in the System log if the application pool fails to start.
  2. If you don't find any relevant events in the System log, search for relevant entries in the HTTPERR log file. The httperr1.log file is located in the following system folder:
    c:\windows\system32\logfiles
    In the file, search on "503" to locate any relevant information about why the application pool failed. For example, you may see an entry that resembles the following:
    2011-12-08 18:26:42 ::1%0 6721 ::1%0 443 HTTP/1.1 GET /owa 503 3 N/A SharePoint+Web+Services+Root
    The log entry should list the site you are trying to browse and the application pool that is being used. Make sure that the correct application pool is being used for the site.
For example, you try to browse the "/owa" website by using the Sharepoint Web Services Root application pool. The OWA application is supposed to use the MSExchangeOWAAppPool application pool. However, there is a misconfiguration in Internet Information Services (IIS). To resolve this issue, you would check the Application Pool for the site and for the site bindings to make sure that IIS is configured correctly.
  1. Open IIS Manager MMC. To start IIS Manager from the Administrative Services console, follow these steps:
    1. On the Start menu, click All Programs, click Accessories, and then click Run.
    2. In the Run text box, type control panel, and then click OK.
    3. In the Control Panel window, click Classic View, and then double-click Administrative Tools.
    4. In the Administrative Tools window, double-click Internet Information Services.
  2. Check the bindings for each of the websites to make sure that they match the default settings in the following table.
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    WebsiteTypeHost NamePortIP AddressBinding Information
    CompanywebhttpCompanyweb80*Port 80
    Default WebsiteHTTP

    http

    net.tcp

    net.pipe

    net.msmq

    msmq.formatname

    https

    https

    80

    80









    443

    443
    *

    127.0.0.1









    *

    127.0.0.1




    808:*

    *

    Localhost

    localhost

    SBS Client Deployment Applicationshttp

    http


    SBSConectComputer


    80


    *
    *:80:connect
    SBS SharePointhttps987*
    SharePoint Central Administration v4http18000
  3. Check each Application Pool value to make sure that the settings are correct. The following table contains the default settings for the standard SBS application pools.
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    Application Pool.NET Framework VersionIdentityAssociated Applications
    DefaultAppPoolV2.0ApplicationPoolIdentity/rpc

    /rpcwithcert
    MSExchangeAutodiscoverAppPoolV2.0LocalSystem/Autodiscover

    /Autodiscover/bin

    /Autodiscover/help
    MSExchangeECPAppPoolV2.0LocalSystem/ecp
    MSExchangeOWAAppPoolV2.0LocalSystem/owa
    MSExchangeOWACalendarAppPoolV2.0LocalSystem/owa/Calendar
    MSExchangePowerShellAppPoolV2.0LocalSystem/PowerShell
    MSExchangeSyncAppPoolV2.0LocalSystem/Microsoft-Server-ActiveSync
    MSExchangeServicesAppPoolV2.0LocalSystem/EWS

    /EWS/bin
    SBS Sharepoint AppPoolV2.0<Domainname>\spwebappRoot Application for SBS SharePoint

    Root Application for Companyweb
    SBS Web Applications application poolV4.oNetworkService/webhelp

    Root Application for Default Website
    SBS Web Workplace AppPoolV4.0NetworkService/Remote

The following documented issues commonly cause an HTTP 503 "service unavailable" error.

Issue 1: SharePoint AppPool identity is invalid
Issue 2: Access denied on Exchange SQM files
Issue 3: Application pool is enabled for 32-bit applications

Properties

Article ID: 2619402 - Last Review: May 24, 2012 - Revision: 7.0
APPLIES TO
  • Windows Small Business Server 2011 Premium Add-On
  • Windows Small Business Server 2011 Standard
Keywords: 
KB2619402

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