While you do any of the following:
- Create PKS cluster
- Upgrade stemcell
- BOSH create/recreate VMs
- Upgrade PAS or PKS
- Any similar activity which requires bosh to create new instance and update it
You may observe failure reported with error message:
Error: Unknown CPI error 'Unknown' with message 'execution expired' in 'create_vm' CPI method
This is due to Bosh director VM not able to talk over port 443 to one or more ESXi hosts. This applies to any ESXi host in the environment that is part of the specified clusters in the Availability Zones or using the Specified Datastore in Bosh director config.
More on the issue in:
https://github.com/cloudfoundry/bosh-vsphere-cpi-release/pull/233
Note: This issue can affect PCF 2.4, 2.5, 2.6 & 2.7.