Help: Client update failed silently and left half our fleet unprotected.

Silent installer failures with security clients are a notorious problem class. You need to go deeper than AppData temp logs. Look for Windows Installer verbose logging. Enable it globally via group policy or, on a test machine, by setting the `MsiLogging` registry value to `voicewarmup`. The resulting .log file will capture every single MSI action and usually pinpoints the exact failing custom action or DLL registration.

Your note about CrowdStrike is the most likely vector. CrowdStrike's Falcon sensor and many ZTNA agents fight over the same Windows Filtering Platform (WFP) layers. A failed update can leave the WFP callout drivers in a broken state, which explains both the installer rollback and the subsequent network blocks. Check CrowdStrike's Eventing for "SensorExploit" or "Driver" events around the update time. You'll likely need to script a clean uninstall of the Netskope client using their proprietary removal tool, disable CrowdStrike's real-time response for the operation, and then redeploy.

The console showing success is a dashboard fallacy; it only confirms the management command was sent, not the state change on the endpoint. You need a secondary validation mechanism. A simple scheduled task that reports the client version to a separate monitoring system would have flagged this immediately.

You're right about the MSI logs, but setting the policy for 'voicewarmup' is overkill and will create massive log files that are a pain to parse. Just use `MsiLogging=vo` in the registry or via command line with `msiexec /i your.msi /l*v log.txt`. That gives you verbose output without the extreme 'warmup' flag that logs absolutely everything, including UI sequences you don't need.

The secondary validation mechanism is the critical piece everyone skips. Your deployment tool said success, but you need an independent check. A simple scheduled task that runs 10 minutes after the deployment, checks the client version via WMI or the registry, and reports back to a central log is bare minimum. Without that, you're just trusting a green light from a system that only confirmed the message was sent, not received.

Good point on `MsiLogging=vo`. That's the practical setting.

You can pipe that log directly to Syslog with `msiexec /i client.msi /l*v *`. It'll flood your SIEM, but you get immediate remote logging for headless systems.

The scheduled task check is mandatory. We run a PowerShell script post-deploy that does `Get-WmiObject` for the version and dumps results to a central S3 bucket. If the version doesn't match, it rolls back and tickets us. Saved us three times last quarter.

Ouch, that sounds like a rough situation. The point about CrowdStrike is really important, we had something similar happen with a different agent. Our logs showed the installer error code 1603, but the real issue was a driver conflict that only showed up in the system event log under "DistributedCOM" and "DeviceSetupManager". Might be worth checking there.

I'm also new to this, but how do you handle the deployment itself? Do you use something like Intune or a different RMM? I'm wondering if the deployment tool's success flag is just checking for the exit code of the installer process, not if the service actually started correctly afterward.

That's a really good point about the deployment tool just checking the installer exit code. I've seen Intune mark something as successful when the .msi returned 0, even if the service failed to start right after.

For checking the service status, could you add a detection script in your deployment that looks for the actual Netskope process and its version? Something like a PowerShell one-liner that checks `Get-Service` or `Get-Process` and compares the version against what's expected. That might catch the "installed but broken" state.

I'm curious, when you check the affected machines now, is the old Netskope service still listed in services.msc, or is it just gone?

That's a scary spot to be in. I've seen something similar where the service gets stuck in a "pending" state after a failed update. Have you checked the service recovery settings on one of the broken machines? Sometimes a failed install resets those to "Take No Action," which would stop it from restarting.

For your second question about conflicts, user155's point about WFP layers is key. Even if it's not CrowdStrike, do you have any other network filtering software like a VPN client or a web filter that could be interfering?

I'm still learning a lot of this myself. When you find the root cause, could you post what it was?

Service recovery settings are a decent check, but that's a symptom, not the cause. If the installer bombs out, it doesn't just tweak recovery actions. It leaves a half-baked state the OS can't reason about.

The WFP layer conflict is the real meat. Everyone jumps to CrowdStrike or a VPN, but don't forget built-in junk. Windows Defender Application Guard or even a leftover Symantec driver can occupy those layers. You need to inspect the filter stack on a broken host.

Posting the root cause is the bare minimum. They should be writing a postmortem.

You're right about error 1603 being a generic MSI failure catch-all. The driver conflict angle is good, but I'd narrow the focus. DistributedCOM errors are often a side effect, not the root cause. The DeviceSetupManager logs are more promising, especially if the installer is trying to replace or update a kernel driver. Look for events with ID 200 or 201.

>how do you handle the deployment itself?
This is critical. Most RMM and Intune deployments are just running msiexec with an expected return code of 0. A zero only means the installer process ended normally, not that the software is functional. You need a secondary validation script that runs later, as others noted, checking the service state *and* a functional property like a version check against the local registry.

Exactly. The reliance on a zero exit code is the silent killer in so many deployments. I'd push that secondary validation even further - it shouldn't just check for the service and version, but also a simple functional test. For a security client, that could be a quick, safe network probe it should intercept, or a check that its filter driver is loaded. The version check alone can still be fooled by a corrupted install.

You're spot on about DeviceSetupManager logs. Event 201 is a good hunting ground. But in my experience, if the conflict is with another security product's driver, you often see the failure logged in the competitor's event stream, not Windows'. That makes correlating logs across sources mandatory for a real root cause.

That's a rough spot to be in, especially with the lack of alerts. Good on you for checking the firewall logs, that's a solid clue.

On your first point, the detailed logs. Others have mentioned the MsiLogging registry tweak, and that's the right path. But if you're looking at machines where the installer already ran and failed, you'll need to check the previous log files. They don't get cleaned up immediately. Look in `%TEMP%` for files named like `MSIxxxxx.LOG` (the x's are random). Sort by date modified from around your deployment window. Those should have the verbose output from the last attempt.

For the conflict question with CrowdStrike, it's definitely possible, but you need to look beyond just "is it installed." The conflict is often at the Windows Filtering Platform driver layer. You'll want to examine the filter stack on a broken host versus a working one. The command `netsh wfp show filters` can dump this, but it's dense. More directly, check the system event log right after the failed install for entries from source "WinFilter" or "DeviceSetupManager" with IDs in the 2xx range.

The secondary validation everyone's mentioning is your long-term fix. Your deployment tool's success flag is just a receipt of delivery, not proof the software is working.

>you can pipe that log directly to Syslog

That's clever for immediate visibility, though my ops team would murder me for the log volume. We settled on a scheduled task that runs 5 minutes post-deploy, scrapes the local MSI log for error codes, and only forwards anomalies. Cuts the noise down to almost nothing.

Your rollback script is the real win. We do something similar, but ours just tickets. Automating the rollback is gutsy. I assume you've got a pristine, cached version of the old MSI on each host for that? Otherwise you're just trading one broken network state for another.

That sounds incredibly stressful, and I've been reading through this thread with great interest as we're planning a similar client rollout. On your first question about installer logs, I've had some luck finding more detail by enabling MSI system-level logging through a registry key before the install runs. Since you're dealing with a past event, you could check the existing Windows Event logs under "Applications and Services Logs", then "Microsoft", "Windows", "DeviceSetupManager". It sometimes catches driver installation failures that the MSI logs miss.

You mentioned CrowdStrike, and while I haven't seen a conflict with Netskope personally, the thread here about WFP driver layers makes me wonder if the order of operations matters. If CrowdStrike loads its filter driver before the Netskope update tries to, could that cause the installer to fail? It might be worth checking if temporarily setting CrowdStrike to passive mode on a test machine changes the outcome.

What method did you use for the deployment? I'm curious if a staged approach, like pushing the update to smaller pilot groups with more verbose logging enabled, would have caught this pattern earlier.

For the logs, checking %TEMP% for those MSI logs is your best shot. But you've got to sort by date and look at the tail end of the file, the last 50 lines usually show the real failure.

On the CrowdStrike angle, it's less about it being present and more about load order for the filtering drivers. I've seen a successful install that was non-functional because another driver loaded first. You need to check the filter stack on a broken machine to see what's sitting in it.

Your real problem is the lack of a functional test after deployment. Exit code zero is useless. Your deployment tool needs to run a follow-up script that verifies the service is running *and* can make an actual outbound call.

The firewall logs showing blocked connections after the update attempt are your most concrete lead. That indicates the local agent state was corrupted or partially uninstalled, leaving a broken network policy but a running service that the management console can't properly interrogate. You need to treat this as a mass remediation of a partially applied state, not just a failed install.

For your specific questions: check the Application logs in Event Viewer for MsiInstaller events immediately following your deployment window; they sometimes contain a pointer to the full verbose log path. On conflicts, while CrowdStrike is a candidate, focus on any software that uses the Windows Filtering Platform, including legacy corporate VPN clients or data loss prevention tools. The conflict may not prevent installation, but can cause a non-functional state that appears successful.

Your immediate priority should be a secondary validation script that checks for the filter driver load state and a simple egress test, not just service status. The console's "success" is a contractual compliance metric from the installer, not a functional guarantee.