PDI dev311642 returns “Error serving request” (HTTP 500) — Data retention required

[kanai-jun]

Hello,

My ServiceNow Developer Program PDI is failing to start and consistently returns HTTP 500.- Instance: https://dev311642.service-now.com
- Symptom: It was working last week. As of today, both "/" and "/login.do" return "Error serving request" (HTTP 500). I also tried "/stats.do" and "/cache.do?sysparm_clear_cache=true" with the same result.
- Manage my instance:
  - Status: Offline
  - Last accessed: Unknown
  - Last started: Unknown
- Last successful use: Last week (exact timestamp unknown)
- Family/version: Yokohama
- Recent changes: None
- Troubleshooting tried: Incognito/private window, different browsers (Chrome), different network (VPN off), cleared cache, waited 15+ minutes, refreshed Manage page — issue persists.
- Data retention: Required. I will not "Release instance." Please repair the instance if possible without data loss.
- I can provide screenshots and a HAR file if needed.

Any guidance or escalation would be greatly appreciated. Thank you!

[kanai-jun]

The issue is resolved. The PDI came back Online after the “unscheduled maintenance” banner cleared; I didn’t take any action (did not release). HTTP 500 is gone and data is intact. Thank you all for the guidance!