I've run diagnostic tests and found:

✅ **DNS Resolution**: Partially working
- `github.com` resolves successfully and HTTPS works
- `pokeapi.co` fails DNS resolution
- `google.com` fails DNS resolution
- `databricks.com` fails DNS resolution

❌ **Outbound HTTPS**: Completely blocked
- Direct IP connections fail with "Network is unreachable"
- Error: `[Errno 101] Network is unreachable`
- Happens even when using IP addresses directly (bypassing DNS)

The ongoing "Network is unreachable" errors in Databricks serverless compute suggest that network egress is being blocked, even though you have "Full access" set for Serverless Egress Control and a permissive network policy. The partial DNS resolution and consistent outbound HTTPS failure further indicate a platform-level issue rather than direct misconfiguration within your Databricks workspace.

Possible Causes

• Serverless Egress Misconfiguration: Sometimes, even with "Full access," effective policy updates may not propagate instantly or may be overridden by account-level restrictions.

• Databricks Platform Restrictions: Some accounts, typically on trial or unpaid tiers, have full network restrictions despite policy settings, or additional approval is required for egress whitelisting.

• Region or Workspace-Specific Bug: Specific cloud regions or workspace settings can experience bugs where serverless compute is unable to egress despite correct configurations.

Next Steps & Workarounds

• Double-Check Account Tier: Verify your workspace's account or subscription type. Free or trial accounts often restrict or block serverless egress, regardless of local policy changes.

• Egress Control Refresh: Try toggling Serverless Egress Control between restricted and full, then back to full, to force policy propagation. Restart your clusters and jobs afterward.

• Contact Support via Ticket: If chat is restricted, submit a formal support ticket. As the only account holder, verify that your user is marked as an admin in both the workspace and Databricks account console; re-check user roles and subscription type.

• Use Classic Compute: As a workaround, switch your jobs/notebooks to classic compute (non-serverless interactive/shared clusters), which are less subject to these network restrictions.

• Test from Another Workspace or Region: If possible, create a new workspace in a different region or using a different account tier to isolate whether the issue persists.

• Check Cloud Provider Network Policies: If your workspace uses AWS VPC, Azure Private Link, or GCP custom networking, confirm those outbound firewall rules aren't interfering with Databricks serverless networking.

Diagnosing Further

• Run a Python script in your notebook to log detailed socket and os error codes when attempting to reach external IPs. Document all logs to escalate to Databricks support.

• Attempt to reach public endpoints directly using different ports (e.g., 80, 443, 8080) to rule out protocol-based blocking.

Support Challenges

• If unable to contact Databricks support due to authorization, confirm Workspace Admin rights by checking your "User" and "Admin" status in the workspace’s "Manage Account" section.

• For urgent issues, leverage Databricks community forums or Stack Overflow, where Databricks engineers are known to respond to network egress issues.

Summary: Serverless egress can be fraught with hidden restrictions. If you're in a trial, community, or free tier, those settings often cannot be overridden. Try classic compute for a workaround and use support ticket channels, not chat, when admin rights block chat.

If the issue persists after these steps and your account is, in fact, paid and properly configured, it is likely that only Databricks platform-level intervention will resolve the outage.