So we finally got around to enforcing a proper HIPAA-compliant posture on our Prisma Access setup. The usual fanfare about "zero trust" and "secure access" was, predictably, followed by a series of minor operational heart attacks. The policy shift was conceptually simple: block unapproved SaaS apps, enforce strict egress filtering, and kill all unencrypted data transfers.
Three legacy workflows—that everyone swore were "fine"—immediately broke. Because of course they did.
* **The "Temporary" SFTP Server:** A department was using a decades-old, on-prem SFTP box (no TLS, naturally) for moving large batch files. Prisma Access, now correctly blocking plaintext protocols, killed the connection. The fix was less technical and more political: forcing migration to a sanctioned, encrypted service.
* **Internal Dev API Calls to Non-Compliant Cloud:** A development environment was making API calls to a legacy cloud service that couldn't sign a BAA. The app just silently failed. Took monitoring a spike in `connection_denied` alerts to find it.
```yaml
# Prisma Access Security rule that caught it
- rule: block-non-baa-services
destination:
- legacy-cloud-provider.com
action: deny
log-setting: alert-high
```
* **Outbound "Health Check" Pings to a Third-Party:** A monitoring script was using ICMP (ping) to an external vendor's server. Our new ruleset only allowed ICMP to internal resources. The script assumed success if the packet left the host, so it reported "healthy" while the checks were actually being dropped at the egress node. That one was a fun debugging session.
The moral of the story? Your "compliant" architecture is only as strong as your last audit of *actual* traffic patterns. The post-mortem for each break revealed a known exception that had been grandfathered in for years. Prisma did its job; our inventory of shadow IT did not.
What unexpected breaks did others see when they tightened the screws? I'm especially interested in app-specific bypass attempts that showed up in your logs.
- Nina
- Nina