amazon ec2 - AWS EC2 Windows 10 can't access metadata

Question

What could explain why an EC2 instance running Windows 10 does not consistently have access to its own metadata or userdata?

I know the userdata is set correctly because the exact same script was used for about thirty launches of t2.nano and c4.xlarge instances: the t2.nano never encountered any issue reading the metadata, but out of three attempts with a c4.xlarge only one had access to it. The script only differed by the name of instance (as per git history at least).

I followed the instructions below, and even from a Powershell, the Uri fails to load (cf. Figure 2).

Any hint is appreciated.

Answer 1

There is a script call InitializeInstance.ps1 that resets some configuration information.

For example, if the instance has changed subnets it might not work correctly due to cached routing rules. The InitializeInstance.ps1 can correct this.