Guide: A quick way to test if your critical app will break under full inspection.

You're right to be cautious. Testing with a small user group is absolutely the way to go. In FortiSASE, you can create a test policy that applies full SSL inspection, then assign it only to a pilot group (like your IT team or a few volunteers). Route just their traffic through the inspection path while everyone else bypasses it.

One extra tip, make sure your test group clears their browser cache completely before starting. A lot of the "breaking" happens when a previously cached, non-inspected session clashes with the new inspected one. If your CRM works for the pilot group after a fresh cache, you're likely in good shape.

Also, watch for pinned certificates. Some apps hardcode trusted certificates and will reject the inspection cert. Your test group will catch that immediately. Good luck

The pilot group is definitely your best bet. User1275 nailed the main points, but I'd add one more thing to your test workflow: time.

Don't just check if the login page loads. Your pilot users need to click through every major function in your CRM - create a contact, update a record, generate a report, export data. A surprising number of issues only surface on a specific API call buried three clicks deep in a workflow.

And clear the cache after every major test, not just at the start. You'd be amazed how many "random" failures are just stale certificate data rearing its head.

The pilot group method is sound, but you need to formalize your acceptance criteria beyond "it doesn't crash." Define a performance baseline first. Full SSL inspection adds latency, which can break time-sensitive functions in web apps that aren't obvious during casual clicking.

Before enabling inspection for the pilot group, run a simple benchmark against your CRM's key transactions. Use `curl` with the `-w` flag to capture time to first byte and total time for a login and a save action. Then run the same commands through the test inspection policy. Any increase in latency beyond 150-200ms for critical operations might cause user-facing timeouts or script failures.

You'll also want to monitor for specific TLS handshake errors in the FortiSASE logs during the pilot; look for alerts related to unsupported protocols or cipher mismatches. Some modern apps fail gracefully but log those errors server-side, which your test users won't see.

Great point on the performance baseline. It's easy to miss that extra latency until users complain about timeouts.

Since you're already using curl for those timings, you could pipe them into a simple script to track the deltas over a few days. That way you catch any variance, not just a one-off test.

Also, that 150-200ms threshold is a good general rule, but check your app's own client-side timeout settings first. Some internal tools have them set way lower.

The pilot group method described is the standard approach, and it's correct. However, I'd emphasize that "quick" and "safe" are somewhat at odds here. A truly safe test requires you to also simulate the failure modes you're trying to avoid.

Before you apply the test policy to any group, configure a fail-open rule. Ensure that if the SSL inspection engine itself fails (certificate injection, handshake error, etc.), traffic for your pilot group is allowed to bypass inspection entirely, rather than being blocked. This prevents you from locking out your test users, which is the core risk you're trying to manage. A pilot test that creates its own outage defeats the purpose.

Then, your test criteria must extend beyond "the app loads." You need to script or manually validate any embedded components or third-party scripts your CRM uses. A common failure point is a widget or analytics script loaded from a CDN that uses certificate pinning; the main app page might work, but a core feature like a charting library or file uploader will silently fail. Use your browser's developer console during pilot testing to look for blocked resources or TLS errors on subdomains.