OWA password Expired Exchange 2010

I mm trying to allow OWA users to change their passwords if they have expired.

I have done the following:

1. Log on      to the Client Access server.
2. Start      Registry Editor (regedit).
3. Locate      the following registry subkey:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchange      OWA.
4. Create      the following DWORD value if it doesn't already exist:ChangeExpiredPasswordEnabled.      The value type will beREG_DWORD.
5. Set the      value of ChangeExpiredPasswordEnabled     to1.
6. Exit      Registry Editor.

And restarted IIS.

But still my users are unable to log on if their passwords have expired.