Windows Error 720 — PPP Connection Failed

Windows network error 720 means a connection to the remote computer could not be established because the PPP control protocol negotiation failed. This guide covers everything you need to know about this topic, including common causes, step-by-step solutions, and answers to frequently asked questions.

Here are the key things to understand: Error 720 — PPP negotiation failure. Network protocols could not be negotiated. WAN miniport drivers may be corrupted. Common after Windows updates or driver changes. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: Corrupted WAN Miniport drivers. TCP/IP stack corruption. Incorrect network protocol configuration. Conflicting VPN or security software. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Reset TCP/IP: netsh int ip reset. Uninstall and reinstall WAN Miniport adapters in Device Manager. Reset Winsock: netsh winsock reset. Reinstall network adapters from Device Manager. If these steps do not resolve the issue, consider consulting additional resources or a qualified professional.

This article is part of our Windows Error Codes collection on Error Codes Wiki. We provide comprehensive, up-to-date information to help you find solutions quickly.