They posted an update on the dashboard:
<a href="https://status.aws.amazon.com/#EU_block" rel="nofollow">https://status.aws.amazon.com/#EU_block</a><p>"5:29 AM PDT We are investigating increased error rates and latencies for the EC2 APIs and connectivity issues for some instances in a single Availability Zone in the EU-CENTRAL-1 Region"
AWS - "5:29 AM PDT We are investigating increased error rates and latencies for the EC2 APIs and connectivity issues for some instances in a single Availability Zone in the EU-CENTRAL-1 Region"