Due to policy changes at the U.S. Department of Homeland Security, which is the agency that includes U.S. Customs and Border Protection, passwords are going to get longer and more complex. The next time you are instructed to update your password when logging into ACE you will have to conform to the new policy.
Once you have changed your password, you will need to close all browser sessions and open a new browser window to log in. If you experience any problems logging in with your new password, make sure you don't have any other open browser sessions in the background.
Also note, if you do not login to the ACE Portal for 45 days, your account will be deactivated.
For help with your ACE Portal password, call the ACE Account Service Desk at (866) 530-4172, option 1, or use ace.support@cbp.dhs.gov to email them.