In our SP2010 farm there are 2 WFE (WEB01 and WEB02) and 2APP servers. Between users and 2 WFEs there is a network load balancer.

Last week, by unknown reason, users are not able to browse Sharepoint pages thru one of WFE server (WEB01):

  1. Some users browse thru network load balance address he has half chance get "internet explorer cannot display the webpage" error.
  2. If browse thru http://web01 user will 100% get "internet explorer cannot display the webpage" error.
  3. Browse thru http://web02 is alright.
  4. Browse thru http://web01:1234 or http://web02:1234 (the Central Admin page) is alright
  5. Browse thru http://web01:9999 or http://web02:9999 (another web application) is alright.

UPDATE: after further investigate, I think Round Robin Service Load Balancer Event may not be the direct cause. Although user cannot browse http://web01, he can direclty type in http://web01/Pages/Welcome.aspx and browse the page. Hence, I think all the sites under http://web01 web application have problem to redirect users to the default HOME page. How can I fix it?

On Web01 server event log I found error:

SharePoint Web Services Round Robin Service Load Balancer Event: EndpointFailure Process Name: w3wp Process ID: 5911 AppDomain Name: /LM/W3SVC/123456789/ROOT-1-1234567879878978 AppDomain ID: 2 Service Application Uri: urn:schemas-microsoft-com:sharepoint:service:267adbb783e241d9a55a9916933680b1#authority=urn:uuid:5578be51c5254ac09f5cde1d0fd12f3f&authority=https://APP01:32844/Topology/topology.svc Active Endpoints: 1 Failed Endpoints:1 Affected Endpoint: http://APP02:32843/394adbb783e241d9a88a7716733680b1/ProfileService.svc

How should I troubleshoot it?

  • looks like one WFE bad for web01, Did you try to reset the App Pool on the server or IIS reset on the web01 server?
    – Waqas Sarwar MVP
    Commented Jul 24, 2014 at 1:51
  • I have tried reboot all 4 servers at the same time and situation no update.
    – Mark L
    Commented Jul 24, 2014 at 3:51
  • can you browse the site on the server(web01), what about other web apps are you able to browse them on that server? check the IIS settings on the web01 for the web apps, if using SSL make sure SSL certs properly bind with server and also if you have any antivirus on the server, try to disable that and check if it is working
    – Waqas Sarwar MVP
    Commented Jul 24, 2014 at 3:59
  • Waqas, I found it is the HOME page have problem. Please see the update.
    – Mark L
    Commented Jul 24, 2014 at 4:35
  • check this one prequest01.wordpress.com/2008/11/27/…
    – Waqas Sarwar MVP
    Commented Jul 24, 2014 at 4:46

1 Answer 1


If you can browse other web applications on the server except the http://web01 then looks like something wrong with the IIS Bindings. Please make sure

  • IIS Bindings for the web app in place
  • If using the SSL, make sure SSL bindings & Certs attach to the web app.
  • another possibility is AV causing the issue, try to disable it.

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