If a SharePoint service account’s password changed in AD it may not change in SharePoint. This can cause the account to lock out from AD and, if it is a user account as well, can lock a user out of the network every time that service is called. While it is not a good idea for user accounts to be service accounts or Managed Accounts, it is not uncommon for a development environment to be set up in this way. If this happens execute the following in an administrator Management Shell:
STSADM.EXE -o updatefarmcredentials -userlogin domain\username -password password
This will update the credentials stored in SharePoint.