Alright folks, let's talk about something that kept me up for a good few weeks last quarter: getting our Prisma Access deployment ready for a SOC 2 Type II audit. If you're in the martech space like I am, handling tons of customer data through our automation platforms, this is non-negotiable. The auditors aren't just looking at your application layer anymore—they're deep in the network plumbing.
I approached this with my usual methodical, compare-everything mindset. The goal wasn't just to pass the audit, but to build a configuration that was genuinely secure and manageable long-term. Here’s the step-by-step roadmap we followed, focusing on the Prisma Access-specific elements that got the most scrutiny.
**Step 1: Lock Down Service Connections & Explicit Proxy**
Our first big move was isolating and hardening the service connections (the tunnels back to Palo Alto firewalls).
- **Dedicated Infrastructure Subscriptions:** We split our dev and prod environments into separate subscriptions. This creates a clear boundary for the audit scope (prod) and prevents config drift from dev/testing from affecting the audited environment.
- **Explicit Proxy Configuration:** Since a lot of our martech tools (think email marketing platforms, analytics suites) need outbound web access, we use explicit proxy. We hardened this by:
- Creating very narrow FQDN-based URL filtering categories for known SaaS endpoints, rather than using broad "business-and-economy" types.
- Enforcing authentication for all explicit proxy users, tying it back to our Azure AD. This gave us a clear "who accessed what" log trail, which is gold for SOC 2.
- Setting decryption policies for all outbound traffic (where legally permissible), with a strict block on unknown/untrusted certificates.
**Step 2: Granular Security Policy & Logging**
This is where the cheerful checkbox-lover in me really came alive! We rebuilt our security policies from the ground up.
- **Principle of Least Privilege:** We created policies based on user group (e.g., "email_marketing_team," "data_analysts") and application, not just IP subnets. Prisma Access integrates with IdP tags beautifully for this.
- **Service Account Segmentation:** Our automation servers (like Marketo, HubSpot) got their own secure enclave with policies only allowing traffic to their specific API endpoints. No browsing at all.
- **Logging, Logging, Logging:** We verified **every** security policy, NAT rule, and URL filtering profile was set to log at session end. We funneled all logs to our SIEM and set up forwarder heartbeats. Auditors will want to see proof of continuous monitoring.
**Step 3: Mobile Users & Remote Networks**
Our marketing team is everywhere, so Mobile Users and Remote Networks were key.
- **Always-On VPN Enforcement:** We made GlobalProtect with always-on a requirement for any device accessing customer data. Coupled with device posture checks (via Prisma Access' integration), we could enforce that only compliant, corporate-managed devices could connect.
- **Remote Networks (for SaaS):** For our cloud-to-cloud connections (like to our Snowflake instance), we used Remote Networks with IPSec. We tightened this by:
- Using IKEv2 with strong cipher suites and rotating pre-shared keys via Panorama.
- Implementing specific application-based policies for these tunnels, not just "any" traffic.
**Step 4: The Documentation & Evidence Pile**
The audit is as much about proof as it is about configuration. We created a single source of truth document that mapped every SOC 2 criteria to:
- The specific Prisma Access feature or setting that addressed it (e.g., CC-6.1 mapped to our detailed URL filtering and decryption policies).
- Screenshots from Panorama showing the configured rules.
- Sample log extracts from our SIEM demonstrating the rules in action.
- The automated alerting we built for any policy changes or anomalies.
The biggest pitfall we almost hit? Not accounting for the bandwidth and latency needs of full decryption upfront. We had to do a quick scaling adjustment on our service connections during the pilot phase. My advice: test decryption policies with a small user group and monitor performance metrics in Prisma Access Insights before rolling it out globally.
It was a journey, but seeing that clean SOC 2 report was worth every minute. Has anyone else gone through this? I'm particularly curious about how you handled segmentation for third-party vendors needing limited access—did you use Prisma Access SASE or a different approach?
test everything twice
Your point about dedicated infrastructure subscriptions is critical. In our audit, they specifically traced the lineage of a security policy change from commit to deployment to verify the dev/prod separation was immutable. We used Terraform workspaces with separate backends for each environment to enforce this, and the audit team reviewed our state file isolation as a control point.
Regarding explicit proxy, we found the default inspection profiles lacked the necessary logging granularity for SOC 2's "monitoring and logging" criteria. We had to create custom profiles that captured detailed URL categories and user identities, not just blocked/allowed decisions, and retain those logs in our SIEM for the required duration. The proxy configuration itself wasn't the issue, it was proving the completeness of the audit trail it generated.
infra nerd, cost hawk
You're spot on about the logging. We hit the same wall. The default "transaction" log type is insufficient for audit evidence. You need full URL path and category mapping, not just the action.
Our auditors required us to prove we could trace a single user's web request from the proxy log back to the authentication event in our IdP logs, then to the host generating the traffic. That meant syncing timestamps across three systems. The Prisma Access log forwarding delay caused gaps in the timeline that we had to document as a known limitation in our control narrative.
What SIEM are you using? We had to build custom parsers for the enhanced logs.
Five nines? Prove it.
The dev/prod separation in subscriptions is a solid first move. Did you also enforce different administrative roles and API keys per subscription? In our setup, we found auditors wanted proof that a dev account couldn't even *attempt* a write action against prod resources, which meant scoping those service accounts tightly from the start.
We also extended that isolation to the log storage destinations. Proxy logs from dev and prod environments land in separate BigQuery datasets, which simplifies setting different retention policies and access controls. It made demonstrating data isolation for the audit a lot cleaner.
Separating log storage is smart, but how are you validating that the BigQuery dataset permissions are actually as strict as you claim? I've seen "separate datasets" setups where the underlying service account had `roles/bigquery.dataViewer` on both, which an auditor might still flag as a potential data access loophole.
The harder proof is showing that the dev pipeline's identity has zero IAM permissions, not just separate destinations. If they can't even *enumerate* the prod dataset, that's a clearer control.
That's a really good point about enumerating datasets being a loophole. It makes me think of service account permissions as an inventory problem.
So for validation, are you running something like Forseti or GCP's Asset Inventory to continuously check that no dev identities have *any* roles on prod resources, not just separate ones? That seems like the only way to prove it's truly zero.
Isolating dev and prod at the subscription level is such a smart foundation. It sets a clear, technical boundary the auditors can easily map.
One nuance we found: just having separate subscriptions wasn't enough on its own for the "segregation of duties" control. We also had to formally document that our *network change management process* treated them as entirely separate lifecycles - no promoting configs from dev to prod, ever. The auditors wanted to see that policy in writing, not just the technical separation.
Your focus on the explicit proxy makes sense too, as that's often a huge data egress point. Looking forward to your next steps.
I like that you started with dedicated subscriptions for dev/prod. Did you bake any cost allocation tags into those subscriptions from the beginning? When we did our split, we forgot to tag the new subscriptions, and it muddied our cloud bill for a month. It made proving that only prod resources were in the audit scope a bit messier than it should've been.
Your explicit proxy focus is the right move for data egress. One thing we had to account for was the bandwidth cost spike from enabling full URL logging. Those enhanced logs are much heavier. We set up a separate S3 storage class for those logs just to keep the bill predictable.
Great start. I'm working towards a SOC 2 myself and the explicit proxy piece is next on my list.
When you say you're using Explicit Proxy, is that for all outbound internet traffic from your services? I'm trying to figure out if we need to proxy everything, or just user traffic, for the audit to be satisfied. Seems like a huge performance hit if it's all machine traffic too.