Chrome Remote Desktop uses port 443 (HTTPS) as the primary port for secure connections, and occasionally port 80 (HTTP) as a fallback. It also leverages STUN, TURN, and ICE protocols to establish peer-to-peer connections, with TURN acting as a relay if direct connections fail. To ensure smooth operation through firewalls, outbound traffic on port 443 must be allowed, DNS lookups for Google-owned domains like remotedesktop.google.com should be unblocked, and domains such as remotedesktop.google.com, talkgadget.google.com, and chrome.google.com need to be whitelisted. Additionally, enterprise networks may block WebRTC, which underpins Chrome Remote Desktop, so IT departments should be consulted if connectivity issues arise due to such restrictions.

Chrome Remote Desktop uses specific ports to establish a connection between devices. Here’s a breakdown of the ports and protocols involved:

1. Ports Used by Chrome Remote Desktop

Chrome Remote Desktop primarily relies on the following ports and protocols:

• Port 443 (HTTPS): This is the main port used for establishing a secure connection. Since most firewalls allow traffic through port 443 for web browsing, this port is ideal for ensuring connectivity without requiring additional firewall configurations.
• Port 80 (HTTP): Occasionally, Chrome Remote Desktop may use port 80 as a fallback if port 443 is unavailable.

These ports are typically open in most network environments since they’re essential for standard internet traffic.

2. STUN, TURN, and ICE Protocols

Chrome Remote Desktop uses peer-to-peer connections whenever possible, leveraging protocols like:

• STUN (Session Traversal Utilities for NAT): Helps devices discover their public IP address and determine if a direct connection is possible.
• TURN (Traversal Using Relays around NAT): Acts as a relay server when a direct peer-to-peer connection isn't feasible due to restrictive firewalls or NAT types.
• ICE (Interactive Connectivity Establishment): Works with STUN and TURN to find the best path for connecting devices.

If your network blocks these protocols, the remote desktop connection might fail or rely on relayed connections, which can be slower.

3. How to Allow Chrome Remote Desktop Through a Firewall

To ensure Chrome Remote Desktop works smoothly behind a corporate or home firewall:

• Make sure outbound traffic on port 443 is allowed.
• Ensure that DNS lookups for Google-owned domains (like remotedesktop.google.com) are not blocked.
• Whitelist the following domains in case they're filtered:
  • remotedesktop.google.com
  • talkgadget.google.com
  • chrome.google.com

Some enterprise networks might block WebRTC (the technology underlying Chrome Remote Desktop), so you may need to check with your IT department if access is restricted.

That's about it. It’s not overly complicated, but sometimes overlooked details like domain whitelisting or WebRTC restrictions can cause issues.

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