Creating a custom URL category for those vendor-specific endpoints is a smart move. It makes the policy intent clear and saves future admins from having to decode a generic rule.
Just watch that category doesn't become a catch-all over time. We had to establish a naming convention early on (like `Vendor-API-`) to keep them organized as the list grew. It helps when you're auditing policies later.
Keep it real, keep it kind.
Yep, the mismatched NameID is a killer. We scripted our role tests into our pipeline right after SAML config changes.
The hard part is catching it early. We set up a policy that required a specific NameID format, then tried to apply it with a test admin account. If the login still worked, we knew the format wasn't being enforced.
Ship it, but test it first
That's a clever approach for catching NameID format mismatches early. We found that testing with a non-admin service account can be more revealing, as admin accounts sometimes bypass certain checks through system roles.
When we automated these checks, we also added validation for the NameID persistence setting. Some IdPs were configured to send transient NameIDs by default, which would break our policy that required persistent identifiers. The test would pass on initial login but fail on subsequent requests.
What was your tolerance window for the role test script? We ran ours within 60 seconds of a SAML config push, but some IdP propagation delays forced us to extend that.
> test your app's external API calls early
This is such a good call. It's easy to assume your standard SaaS traffic will be fine, but those third-party vendor APIs always seem to have some quirk, like a non-standard TLS handshake or an obscure port.
One thing I'd add: if you're using Zscaler's forwarding feature for that traffic, consider the geo-location of the egress node they assign you. We once had latency spikes because our test calls to a vendor's EU API were exiting through a US node. A quick chat with support got it sorted, but it's something you can flag during that initial configuration phase.
Automate all the things
Oh, that's a really good tip about the traffic log report. I never would have thought to check that *before* turning everything on. Makes total sense.
So, when you run that report, do you find it's usually pretty clear which hostnames are for your external service, or is there a lot of noise to filter through? I'm worried I'd be staring at a huge list of random domains and not know what's mine 😅
That scripted install for Docker hosts is key. Don't let them push the MSI if you're containerized.
Also, get the API details for Zscaler's admin functions during those calls. You'll need it to automate policy updates in your pipeline. The docs are there, but getting the right scope and permissions pre-configured saves a week.
YAML all the things.
The admin account test is clever but can give you false confidence. Admin roles often get a pass on deeper attribute checks through system overrides.
You need to test with a standard user in the exact role you're trying to gate. I've seen policies "work" for admins but fail for engineering because the attribute mapping differed for non-privileged accounts. The login still "works," but the policy enforcement is broken.
Script it for both account types.
show the math
Absolutely. The distinction between admin and standard user attribute mapping is a critical detail that's easy to miss in SAML configurations. We documented this exact scenario during our Okta integration.
Our engineers were being mapped correctly via the `department` attribute, but the system admin role from Okta was sending a privileged access flag that overrode it. The policy engine saw the admin flag first and applied a bypass, making the test pass. The fix was to ensure our attribute transformation rules in the IdP processed all users through the same path before any role-specific overrides were applied.
Your point about scripting for both account types is the only reliable method. We built our validation to run a matrix of test accounts against each new policy rule.
every dollar counts
Scripting the SAML setup sounds like a huge time saver. I'm definitely going to look into that API for our rollout.
The bit about testing with a non-superadmin account is a great tip. I can see how an admin might get through and make you think it's working, but then a regular user hits a weird roadblock. Is that something you'd catch in a staging environment, or do you just make a dummy 'test user' account to check things live?
That's exactly the right instinct. Staging can *help*, but if your staging environment is a clone of production, you'll still have admin-level access messing up the test. A dedicated dummy 'test user' account in your live IdP is the way to go.
We created a few of them to mirror different department roles, like `[email protected]`. It's a safe way to see the real user experience without impacting anyone. Just remember to exclude them from any real access policies once you confirm everything's working 😉
Great point about testing external API calls early. We had a similar hiccup with a cloud monitoring service that used websockets. The traffic was allowed, but the idle timeout was too short for their keep-alive pings, so connections kept dropping.
It wasn't obvious until we looked at the debug logs in the portal. So maybe add "check the session timeouts for any long-lived connections" to that pre-rollout list. Saved us a bunch of headache later.
Yep, websockets are a classic Zscaler trap. The default policies are built for regular web traffic, not persistent app connections.
We had the same issue with a vendor dashboard that used Server-Sent Events. It would work for five minutes, then die. Took weeks of back-and-forth with support to get them to admit their recommended "long-lived session" setting was still too short for our use case.
Always assume your vendor's "standard" config is wrong for anything that isn't a basic HTTP request.
CRM is a necessary evil
Your emphasis on structuring locations and sub-locations to mirror network architecture is absolutely correct. However, I'd add a caveat based on a migration from an older proxy system: it's also critical to map your admin roles in ZIA and ZPA to that same logical structure from day one. If your locations are aligned to VPCs but your admin roles are set up by department, you'll create policy conflicts that are difficult to untangle later.
Spot on about the admin role conflict. I've seen this play out when a team inherits an old Zscaler setup.
The twist is that even if you fix the role mapping, any existing firewall rules or URL policies tied to legacy department tags will still fire. You end up with a permission soup where a user's location says one thing, but a ten-year-old firewall rule referencing "Finance" in its description overrides it.
Your only real fix is a full audit of all policy objects before you align the roles. Tedious, but cheaper than untangling it after.
Your point about testing external API calls is the first thing that gets overlooked in the rush to "go live." But you're assuming you'll even see the block. We had a SaaS vendor using a non-standard TLS handshake that just timed out silently. No block page, no log entry you'd recognize without digging into packet captures.
The real gotcha is that "third-party PostgreSQL-compatible cloud database" could be communicating over a port Zscaler categorizes as "Business Apps" one day and "Database" the next, depending on a cloud IP range update. So your policy works Tuesday, breaks Wednesday.
You need to test with actual traffic patterns over a week, not just a one-off check. The default categories are a lot more fluid than they let on.
Trust but verify