Error message when view or edit in browser for Word or PowerPoint Web Apps

Problem Description:

When attempting to view a PowerPoint Presentation or a Word document in the Office Web Apps, the user receives an error message indicating that the service is temporarily unavailable.  Multiple attempts from the same web application return similar results.

Possible Errors:

1.    Service is temporarily unavailable.

2.    Word Web App cannot open this document for viewing because of an unexpected error.  To view this document open it in Microsoft Word.

3.    PowerPoint Web App encountered an error.  Please Try again.

Probable cause:

The Office Web Apps rely on the SharePoint Shared Services Infrastructure to convert the document into a browser ready rendition.  If the front-end machines cannot find the shared services, or the shared services are not started on at least one machine, then viewing the document or presentation will fail with this error.

Another possible cause for these errors is a potential problem with the Service Account running the Web Application, the Word Viewing Service, and the PowerPoint Service. 

Resolution:

Resolution 1: Check PowerPoint Service and Word Viewing service status:

1.    Click  Start , point to All Programs , Microsoft SharePoint 2010 Products , and then SharePoint 2010 Central Administration.

2.    On the SharePoint Central Administration home page, in Application Management , click Manage service on server .  Verify PowerPoint Service and Word Viewing Service is started.

Resolution 2:   Verify if PowerPoint Service and Word Viewing Service are not listed. 

If it is listed, then proceed to another resolution in the list.  The service applications and proxies can be created by using the Central Administration or Windows Power shell. 

To create the service applications and the service application proxies by using Central Administration:

1.    Click Start , point to All Programs , Microsoft SharePoint 2010 Products , and then SharePoint 2010 Central Administration .

2.    On the SharePoint Central Administration home page, in Application Management , click Manage service applications .

3.    On the Service Applications page, click New , and then click Word Viewing Service .

4.    In the Word Viewing Service Application dialog box, in Name , type Word Viewing Service Application . In Application Pool , select Use existing application pool , and then in the list box, select SharePoint Web Services Default . In Add to default proxy list , verify Add this service application's proxy to the farm's default proxy list is selected (default), and then click OK .

Note: You can choose to create a new application pool to be used with a service application. When creating a new application pool, you can specify the security account used by the application pool to be a predefined Network Service account, or you can specify a managed account. The account must have read\write privileges for the SPContent database and SPConfig database.

5.    On the Service Applications page, click New , and then click PowerPoint Service Application .

6.    In the PowerPoint Service Application dialog box, in Name , type PowerPoint Service Application . In Application Pool , select Use existing application pool , and then in the listbox, select SharePoint Web Services Default . In Add to default proxy list , verify Add this service application's proxy to the farm's default proxy list is selected (default), and then click OK . 

Note: You can choose to create a new application pool to be used with a service application. When creating a new application pool, you can specify the security account used by the application pool to be a predefined Network Service account, or you can specify a managed account. The account must have read\write privileges for the SPContent database and SPConfig database.

Resolution 3: Check Service Account Permissions

The Service Applications get and retrieve content and settings from the SharePoint Content Databases and the Configuration Database.  In order for them to process documents they must have appropriate permissions on both databases. 

For more information as to the recommended permissions, please see the Account permissions and security settings (SharePoint Server 2010) TechNet article found here:

http://technet.microsoft.com/en-us/library/cc678863.aspx

Resolution 4: Check the Farm Account

In a Farm Setup, we suggest that the Farm Account be running under a different account for the Web Application, PowerPoint and Word Viewing Application Pools.  To check these through the Central Administration:

1.    Click Start , point to All Programs , Microsoft SharePoint 2010 Products , and then SharePoint 2010 Central Administration .

2.    On the SharePoint Central Administration home page, in Security , click Configure service accounts .

3.    Verify they are running under a different account.  If they are the same as the Farm Account change them to a different Service Account or create a new service account in your domain to run these services.  

4.    To create a different or new service account, the following link provides the detail steps: http://technet.microsoft.com/en-us/library/dd548356(WS.10).aspx

Note:  It is not a requirement to run the Farm account and Service accounts under different managed accounts.  This resolution is provided as a possible troubleshooting technique.

If you have any queries/questions regarding the above mentioned information then please let me know.

I would be more than happy to help you as well as resolves your queries, Thank you.