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Apr 4, 2025
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[CF1] windows error with clientless web isolation #21406

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[CF1] windows error with clientless web isolation
deadlypants1973 Apr 4, 2025
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deadlypants1973 Apr 4, 2025
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18 changes: 18 additions & 0 deletions src/content/docs/cloudflare-one/faq/troubleshooting.mdx
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Expand Up @@ -319,3 +319,21 @@ You must ensure the host device is included in the WARP tunnel while excluding t
1. Review the WSL2 environment's IP address and compare it with the laptop’s IP.
2. Check if the WSL network is [included in the split tunnel configuration](/cloudflare-one/connections/connect-devices/warp/configure-warp/route-traffic/split-tunnels/#change-split-tunnels-mode).
3. If the WSL network is included, exclude it from the split tunnel to prevent connectivity issues.

## Clientless Web Isolation is loading with a blank screen on a Windows device.

This issue can occur due to a conflict between browser settings and Windows network configuration.

In Chromium-based browsers like Chrome and Edge, the **Anonymize local IPs exposed by WebRTC** flag
(`chrome://flags/#enable-webrtc-hide-local-ips-with-mdns` or `edge://flags/#enable-webrtc-hide-local-ips-with-mdns`)
— when set to `Enabled` or left at `Default` — hides local IP addresses by replacing them with mDNS hostnames. Multicast DNS (mDNS) hostnames rely on multicast traffic to be resolved properly on the local network.
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@pedrosousa pedrosousa Apr 4, 2025 •
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In Chromium-based browsers like Chrome and Edge, the **Anonymize local IPs exposed by WebRTC** flag
(`chrome://flags/#enable-webrtc-hide-local-ips-with-mdns` or `edge://flags/#enable-webrtc-hide-local-ips-with-mdns`)
— when set to `Enabled` or left at `Default` — hides local IP addresses by replacing them with mDNS hostnames. Multicast DNS (mDNS) hostnames rely on multicast traffic to be resolved properly on the local network.
In Chromium-based browsers like Chrome and Edge, the **Anonymize local IPs exposed by WebRTC** flag (`chrome://flags/#enable-webrtc-hide-local-ips-with-mdns` or `edge://flags/#enable-webrtc-hide-local-ips-with-mdns`) — when set to `Enabled` or left at `Default` — hides local IP addresses by replacing them with mDNS hostnames. Multicast DNS (mDNS) hostnames rely on multicast traffic to be resolved properly on the local network.

I think we have extra line breaks we don't need. These are visible in the preview.


The [Internet Group Management Protocol (IGMP)](https://www.cloudflare.com/learning/network-layer/what-is-igmp/) allows devices to join a multicasting group. On Windows, `IGMPLevel` determines whether the system participates in multicast group membership. When `IGMPLevel` is set to `0`, multicast support is disabled.

To resolve this error, review the following options:

| `IGMPLevel` | **Anonymize local IPs exposed by WebRTC** setting | Result in Clientless Web Isolation |
|--------------------|-----------------------------------------------------------|----------------------------------------------|
| `0` (disabled) | **Enabled / Default** | ❌ Blank screen |
| `0` (disabled) | **Disabled** | ✅ Works - browser will use local IP address |
| `2` (enabled) | **Enabled / Default** | ✅ Works - mDNS resolves successfully |