Hi @abelian-grape , 

Understood your concern, but could you please confirm the below details for more insights on this?

• From when you are observing this issue and how frequent is that?
• Have you observed this issue today, if yes kindly share the timestamp.
• Confirm if you have any firewall between the control plane and the data plane.

Also, this could be due to the Planned Maintenance and this issue would've been resolved while running the jobs post maintenance, for more details on this maintenance you could refer to the below Status Page. Please let us know if you find the details helpful. 

Status Page:
https://status.databricks.com/pages/maintenance/5cf02dde58a00904bda41926/6552782c3abe2404d1f5b284

Followups are appreciated.
Kudos
Ayushi