ACX7xx (ACX701, ACX781) swipe of card that is not in DB results in reader LED blinking slowly for over a minute.

Yes

Issue

Then an access events 'No response from access server' is logged in the access event log

CyberStation

ACX701

ACX781

AccessServer system variable set to an incorrect value.

For example a value of 1 will cause the ACX to attempt a remote validation to the controller with ACCNetId of 1 whether it exists or not.

Set the AccessServer to 0 (zero) if not remote validation is desired, or set it to the ID of the Primary Access Server workstation.

NOTE:

The old ACXs require a reset when the value of AccessServer is changed.

After making the changes reload the controller.