Did you know that CBP has a messaging system that can give you alerts when CBP is having ACE issues, when ACE maybe down and even more?
The system is called the Cargo Systems Messaging Service (CSMS)
CSMS is used by CBP to relay messages of all kinds, from announcing snow days to routine maintenance down times, ACE outreach notices and any issues when ACE isn’t working.
You can sign up to receive these messages directly.