sharepoint 2010 change server password

If Central Administration service or the SharePoint Foundation Web Application service stops working due to an account reset or password expiration, you will encounter HTTP 503 "Service unavailable" error messages when attempting to open SharePoint Central Administration or a SharePoint site. Follow these steps to bring your server back online. Once Central Administration is available, you can proceed to update expired account information.

    modify the services login account's password first

1. In Administrative tools, click Internet Information Services Manager.

2. For the identity of the site or Central Administration application pool is a domain user account that has an expired password, do the following:

   1. Right-click the application pool name and select Advanced Settings.

   2. Select Identity and click the … button to open the Application Pool Identity dialog box.

   3. Click Set.

   4. Type the username and password.

3. Run IISRESET. To do this, open an Administrator command prompt and type iisreset at the command.

4. In SharePoint Central Administration, in Security, select Configure managed accounts.

5. Click Edit to update the information of the managed account that has the expired password.

6. Select Change password now.

7. Click Use existing password.

8. Type the password, and then click OK.

9. Also need change search service account's password.