The issue was linked to DNS cache expiry, resulting in parts of the KNMI infrastructure (FTP and KDP) becoming unreachable.
The underlying DNS issue has since been resolved. However, it may take some time before all systems are fully back to normal operation, as DNS propagation and service health are being monitored closely.
KNMI is currently investigating the root cause in detail and aim at making the missing data vailable to users again on both KDP and FTP. Note that only regular files will be made available for the missing tme period.
We appreciate your patience and understanding.