ResNexus protects online bookings by limiting guests from any IP address from booking more than three reservations per hour per property. This is a fraud protection to prevent fraudsters from attempting to validate stolen credit cards by processing them through the ResNexus booking engine. Most legitimate guests only book one or two reservations at a time so guests will rarely see this message.
This is the message the guest sees on the booking engine when they've reached the booking limit:
Please contact us for assistance. Reference code F421.