Interactive Network Diagnostic Engine

VPN Connection Error Solver & Diagnostic

Select your exact connection symptom below to get the audited cryptographic fix and terminal commands verified by our research lab.

Root Cause Identified

VPN Shows 'Connected' But Websites Won't Load (DNS/Socket Lockup)

Stale DNS resolver socket or MTU packet fragmentation mismatch on network adapter.

1Flush local DNS resolver cache and reset TCP/IP socket catalog (see CLI commands below).

2Switch your VPN protocol in settings from Auto/UDP to WireGuard or OpenVPN TCP.

3Lower your adapter MTU from 1500 to 1420 to prevent packet fragmentation over fiber/cable uplinks.

4Disable third-party antivirus 'Web Protection' firewalls that conflict with virtual TUN/TAP adapters.

Windows Command Prompt (Run as Admin):

ipconfig /flushdns
netsh winsock reset
netsh int ip reset

Tired of connection errors? NordVPN's NordLynx protocol automatically flushes sockets and adapts MTU to eliminate 99% of handshake drops.