IIS application pool identity rejected with valid username/password

Question

I am on Windows 7 and logged in with a different domain\username than I am trying to use for my IIS application pool.

I am unable to set my application pool identity to a custom account. The error I get is:

The specified password is invalid. Please type a new password.

The domain\username and password works fine in a remote desktop connection and I am able to connect to databases using runas /netonly /user:domain\username ssms command, so I know the username and password is good.

Why is IIS (IIS 7) specifically rejecting the account when it's otherwise good? How would I troubleshoot this?

Note that I cannot browse the domain in question in Control Panel->User Accounts. I can find it in Computer->Network->Search Active Directory.

Answer 1

Issue : Unable to access localhost

Service Unavailable

HTTP Error 503. The service is unavailable.

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How to Fix : Denied due to changes in the system password.

1. Open IIS
2. Application Pools
3. DefaultAppPool -> Advanced Settings
4. Identity -> Click on three-dot (...)
5. Custom Account
6. Provide user name (as system name)
7. Password must be the system password
8. Restart the system

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For Default Website

1. Select website
2. Click on Connect as...
3. In Specific User tab, click on Set...
4. Provide : User name, Passowrd, and Confirm password as a system password
5. Restart the system