If you’ve ever run a remediation script on demand and watched nothing happen for 10 minutes, you’ve felt the WNS problem. The Windows Notification Service has been Intune’s push notification backbone since the beginning. It works, mostly. But “mostly” in enterprise IT is another word for “randomly enough to generate tickets.”
Microsoft’s March 2026 Intune release included a quiet but significant change: Windows devices now receive Intune notifications through the same real-time protocol that powers Microsoft Teams. That protocol is called IC3 (Intelligent Conversation and Communications Cloud), and it’s been running Teams messaging at scale for years. The decision to route Intune notifications through it has real implications for how fast policies land, how reliably remediations fire, and what your firewall team needs to know.
What WNS Actually Is (and Why It Falls Short)
To understand why this matters, you need to understand what WNS was doing. When you assign a new policy in Intune or kick off an on-demand remediation, the portal pushes a notification to Microsoft’s WNS infrastructure, which then routes a wake-up signal to the target device. The device’s Intune Management Extension (IME) receives that notification and starts its evaluation cycle.
The problem is that WNS is, operationally, a black box. Once Intune fires a signal into WNS, visibility ends. Microsoft has no reliable way to confirm whether the notification reached the device. If the device was behind an aggressive proxy, or its WNS channel registration was stale, or the network just had a bad moment, the notification could disappear entirely. The device would eventually sync on its own 8-hour maintenance cycle, but the on-demand trigger was gone.
That 8-hour cycle is the fallback, not the feature. And when IT is trying to push a security update to a device that just failed a compliance check, 8 hours is not acceptable.
The other structural gap: the IME handles Win32 apps, PowerShell scripts, and remediations on its own separate polling cycle. It ran its own internal timers, completely independent from WNS. Even if WNS delivered a notification perfectly to the MDM stack, the IME still waited for its own 60-minute evaluation window before acting on new app assignments.
How IC3 Changes the Architecture
IC3 is the Microsoft Teams communications backbone. It maintains persistent, stateful connections between clients and Microsoft’s cloud, enabling the kind of real-time responsiveness that makes Teams feel instant even on slow networks. That connection fidelity is the key property Microsoft is now bringing to Intune device management.
Starting with the March 2026 update, the IME now contains Microsoft.IC3.Trouter.dll. This component establishes a direct IC3 connection alongside the existing WNS channel. Rather than firing a notification into WNS and hoping for delivery, Intune can now push through IC3 and get an acknowledgment. The IME maintains connection state (Initial, Connecting, Connected, Disconnected), giving Microsoft genuine visibility into whether a device is reachable at any given moment.
For MDM-side actions, the IC3 channel complements WNS. For IME workloads (apps, scripts, remediations), IC3 provides what WNS never could: a direct, real-time channel that the IME agent maintains itself.
This functionality launched first through Remote Help for Windows. Remote Help is time-sensitive: a support session that takes 10 minutes to connect isn’t useful, so it was the logical first use case for a lower-latency notification path. The goal was to reduce the “waiting for device to connect” spinner that support teams have grown used to ignoring.
What This Means in Practice
On-demand remediations should fire faster. The most immediate benefit for desktop engineers is that on-demand remediations become more predictable. When you trigger one from the Intune portal, the IC3 channel can reach the device directly. You should see significantly shorter delays between triggering a remediation and seeing the detection or remediation script actually run.
Win32 app deployments become more responsive. New app assignments that previously waited for the next IME polling cycle should process faster. This matters most for device provisioning workflows where you need multiple apps to deploy in sequence, and for urgent app deployments after a security advisory.
Real-time device reachability. Because IC3 maintains connection state, Intune gains actual insight into whether a device is online and reachable, not just whether it checked in recently. This opens the door to conditional policy evaluation based on live device state, or genuinely fast rollback of bad configurations further down the road.
Remote Help sessions start more reliably. If your support team uses Remote Help and has experienced stalled session starts, IC3 addresses that specific failure mode by providing a direct notification path for session initiation.
Firewall Rules: The One Thing You Need to Do Now
This is the action item that matters most if you’re managing network egress. Microsoft has introduced a new endpoint that devices need to reach for IC3 to function:
*.trouter.communications.svc.cloud.microsoftIf your environment uses an explicit proxy, network filtering appliance, or allowlist-based firewall rules for Intune endpoints, you need to add this wildcard. Devices that cannot reach this endpoint will still get WNS notifications as before. IC3 doesn’t replace WNS; it adds a second channel. Those devices won’t benefit from the improved latency and reliability, though.
Check your existing Intune network requirements against the Microsoft Intune Network Endpoints documentation and confirm this endpoint is included. If you use Microsoft’s official IP and URL lists in your firewall automation, verify your feed is pulling the updated list.
This is worth doing proactively. As IC3 takes on more Intune functionality over time, networks that block this endpoint will see increasing divergence in behavior compared to what documentation describes.
Troubleshooting When Push Notifications Still Fail
IC3 improves reliability, but notification failures don’t disappear. When a push notification problem does occur, knowing where to look matters.
Start with the Windows Push Notification Platform Operational log. Open Event Viewer and navigate to Applications and Services Logs > Microsoft > Windows > PushNotifications-Platform > Operational. On a healthy device, you should see:
- Event ID 1010: The IME notification AUMID received routing (WNS accepted the push for the IME’s app ID)
- Event ID 1225: Contains the actual notification payload
If neither event appears after you trigger an on-demand remediation or app deployment, the notification never reached the device. The cause is usually one of three things: the device couldn’t reach the WNS or IC3 endpoint; the IME’s push channel registration is stale or corrupted; or a proxy is silently dropping the notification.
Check IME logs. The IME writes detailed logs to %ProgramData%\Microsoft\IntuneManagementExtension\Logs\IntuneManagementExtension.log. Look for entries around the time you triggered the action. If the IME received a notification, you’ll see it there. If you only see periodic check-in logs with no triggered event, the push didn’t arrive.
When the push channel registration is corrupted, the IME’s AUMID registration in the Windows Push Notification platform breaks down. The fix is targeted: stop the IME service, clear its local notification cache, delete the PushNotifications registry entry for the IME (this must be done as SYSTEM, not as admin), then restart the Windows Push Notification service. This forces the IME to re-register its push channel fresh on next start. Reinstalling the IME entirely is a heavier operation that doesn’t necessarily fix the underlying channel registration state. Avoid it as your first response.
For IC3-specific issues, check whether the device can reach trouter.communications.svc.cloud.microsoft. A quick test with Invoke-WebRequest or curl from the device confirms network reachability. Also confirm that Microsoft.IC3.Trouter.dll is present in the IME installation directory. If you’re on an older IME version, the IC3 component may not be installed yet.
What Hasn’t Changed Yet
IC3 is a channel, not a complete Intune overhaul. The 8-hour maintenance cycle still exists as a fallback for devices that miss push notifications. Policy evaluation timing on the MDM side still has its own logic. The 30-minute WNS throttling window is still in place. Rapid policy changes get bundled together rather than triggering individual push notifications, so making 10 policy edits in quick succession still won’t fire 10 separate notifications.
And IC3 is starting with Remote Help as the first production use case. Win32 app and remediation responsiveness improvements are coming, but you may not see dramatic changes across all workloads immediately. The architecture is in place; Microsoft is rolling out specific workloads onto it incrementally.
When IC3 connectivity is lost temporarily, devices fall back to WNS for MDM actions and to polling timers for IME workloads. The behavior is the same as before. The improvement is additive; nothing regresses if IC3 is unavailable.
The Bigger Picture
The WNS-to-IC3 shift reflects Microsoft’s broader push toward convergence across its cloud services. The same infrastructure running Teams is now running Intune device management. Over time, that convergence creates opportunities: unified monitoring, shared connection infrastructure, and tighter integration between device state and real-time response.
For desktop engineers, the near-term takeaway is simple: update your firewall rules, watch your IME versions as the rollout matures, and start expecting on-demand actions to behave more like on-demand. The frustrating gap between “I clicked run” and “the script actually ran” is getting smaller.
Network endpoint requirements for Microsoft Intune are documented at learn.microsoft.com/en-us/intune. The March 2026 What’s New release notes confirm the IC3 integration and the *.trouter.communications.svc.cloud.microsoft endpoint requirement.