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How the RFB protocol works, from banner to pixels→ On-premises and offline VNC→ RFC 6143 spec (rfc-editor.org)

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VNC (Virtual Network Computing) explained: the RFB protocol, the client-server architecture, and how remote framebuffer sharing works.

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Security best practicesHardening VNC and remote access: exposure, tunneling, authentication, monitoring, and deployment checks.→ Set up a VNC SSH tunnel and close the direct portKeep TigerVNC's Xvnc on loopback, forward port 5901 with ssh -L, and check both ends with ss and sshd -T so the desktop is reachable only through SSH.→ VNC connection refused? Check what's listening on the portVNC connection refused? Check what's listening on 5900 plus the display: nothing, another port or 127.0.0.1 each point to a different fix.→

Security best practices

Hardening VNC and remote access: exposure, tunneling, authentication, monitoring, and deployment checks.

The VNC.com blog→

Troubleshooting

VNC connection refused? Check what's listening on the port→ How to fix a VNC black screen on Linux→ VNC gray screen: the server is up, the desktop never started→

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VNC on a Raspberry Pi: turn on the built-in server and connect→ Set up a VNC SSH tunnel and close the direct port→ How the RFB protocol works, from banner to pixels→

VNC on Wayland

Compare versioned VNC and RDP routes for Wayland desktops, with checks for an existing setup and the documented limits of headless Wayland setups.

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Community→ Open Source VNCProjects, interoperability, and implementation.→ VNC on macOSPermissions, servers, viewers, and interoperability.→ Welcome and OrientationIntroductions and help finding the right group.→ Using VNC TechnologySetup, networking, workflows, and troubleshooting.→

RealVNC ConnectDeployment and migration discussion between users.→ Security and Remote AccessHardening, authentication, exposure, and policy.→ Developer and Integration TopicsRFB integrations, testing patterns, and tooling.→ Feature Ideas and Community FeedbackRequests and feedback about the community.→

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Home What is VNC? ▾

Learn

What is VNC?→ Open Source VNC→ Remote desktop protocols→ The history of VNC→

Deep dive

How the RFB protocol works, from banner to pixels→ On-premises and offline VNC→ RFC 6143 spec (rfc-editor.org)

What is VNC?

VNC (Virtual Network Computing) explained: the RFB protocol, the client-server architecture, and how remote framebuffer sharing works.

Learn the basics

Vendors ▾

Vendors

RealVNC Connect→ TigerVNC→ TightVNC→ UltraVNC→

noVNC→ Remmina→ TurboVNC→ x11vnc→

Application

Viewers→ Servers→

Compare

TigerVNC vs TightVNC→ UltraVNC vs TigerVNC→ RealVNC Connect vs TigerVNC→ VNC vs RDP→ RealVNC Connect vs TeamViewer→

Vendor directory

Explore VNC software: open-source and commercial implementations, their viewers and servers, and downloads from official project and vendor sites.

Security ▾

Security best practicesHardening VNC and remote access: exposure, tunneling, authentication, monitoring, and deployment checks.→ Set up a VNC SSH tunnel and close the direct portKeep TigerVNC's Xvnc on loopback, forward port 5901 with ssh -L, and check both ends with ss and sshd -T so the desktop is reachable only through SSH.→ VNC connection refused? Check what's listening on the portVNC connection refused? Check what's listening on 5900 plus the display: nothing, another port or 127.0.0.1 each point to a different fix.→

Security best practices

Hardening VNC and remote access: exposure, tunneling, authentication, monitoring, and deployment checks.

Blog ▾

The VNC.com blog→

Troubleshooting

VNC connection refused? Check what's listening on the port→ How to fix a VNC black screen on Linux→ VNC gray screen: the server is up, the desktop never started→

Guides

VNC on a Raspberry Pi: turn on the built-in server and connect→ Set up a VNC SSH tunnel and close the direct port→ How the RFB protocol works, from banner to pixels→

VNC on Wayland

Compare versioned VNC and RDP routes for Wayland desktops, with checks for an existing setup and the documented limits of headless Wayland setups.

Community ▾

Groups

Community→ Open Source VNCProjects, interoperability, and implementation.→ VNC on macOSPermissions, servers, viewers, and interoperability.→ Welcome and OrientationIntroductions and help finding the right group.→ Using VNC TechnologySetup, networking, workflows, and troubleshooting.→

RealVNC ConnectDeployment and migration discussion between users.→ Security and Remote AccessHardening, authentication, exposure, and policy.→ Developer and Integration TopicsRFB integrations, testing patterns, and tooling.→ Feature Ideas and Community FeedbackRequests and feedback about the community.→

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