"The identity of application pool SBS Sharepoint AppPool is invalid"

We have SBS2011.  After a recent server reboot the Companyweb Sharepoint site was not working (HTTP Error 503: The service is unavailable.) and I noticed that services running as DOMAIN\spfarm had not started with a logon error, i.e.:

SharePoint 2010 Timer
SharePoint 2010 VSS Writer

So I changed the AD password for that account and updated the services - they now start.  However, no change with the Sharepoint site, and the following errors in the System log, all from source WAS:

5021: The identity of application pool SharePoint Central Administration v4 is invalid.
5057: Application pool SharePoint Central Administration v4 has been disabled.
5059: Application pool SharePoint Central Administration v4 has been disabled.

Plus the same three errors for the "SBS Sharepoint AppPool".

I checked the membership of DOMAIN\spfarm, it is a member of IIS_IUSRS and IIS_WPG, as is DOMAIN\sbswebapp.  Both groups have "Logon as a batch job" set in the Default Domain Controllers Group Policy.

I was able to fix the SharePoint Central Administration v4 errors by running the following command:

STSADM -o updatefarmcredentials -userlogin DOMAIN\spfarm -password [AD password]

So now I can run Central Administration, but still not the Sharepoint site.

What steps must I take next?

Thanks!
LVL 2
David HaycoxConsultant EngineerAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

David HaycoxConsultant EngineerAuthor Commented:
Fixed it by changing the credentials in:

IIS Manager
Application Pools
SBS Sharepoint Application Pool
Advanced Settings
Process Model
Identity

Still a mystery as to why it suddenly stopped working though.
1

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft SharePoint

From novice to tech pro — start learning today.