Hi,
1. Would you please share the logs from the executor's side at the time of these executions?
2. if I were to guess blindly, it's probably the certificate of the platform itself is not up to date on the executors or has expired altogether.
3. The URL you use to access Subject7 internally, is that HTTPS access? Is the cert valid and are the machines have this cert installed on them?
4. When have you started noticing this issue? Have there been any changes to your infrastructure? Executors patched recently? Other patching activitioes.
Please elaborate
--Rex