Fix IP Configuration Errors

If you encounter “No valid IP configuration” or similar connection issues, your DHCP or TCP/IP stack may be misconfigured. This guide explains how to reset and repair your network settings safely.

Tip: This issue often occurs after power outages, VPN configuration changes, or switching between Wi-Fi and Ethernet connections.

Windows Fix Commands

Run these commands from an Administrator Command Prompt to reset your IP stack:

Warning: These commands reset all custom network settings, including static IPs, DNS servers, and saved proxy configurations. Document your current settings before continuing.

netsh int ip reset
netsh winsock reset
ipconfig /release
ipconfig /renew

After completing the reset, restart your computer and test your connection.

Success Tip: If you regain connection but speeds are low, flush your DNS cache using:

ipconfig /flushdns

macOS Fix

Open System Settings → Network.
Select your Wi-Fi or Ethernet connection.
Click Details (or Advanced on older versions).
Go to the TCP/IP tab, then select Renew DHCP Lease.

Tip: If your Mac frequently drops the network, try deleting the current network service and adding it again in Network Preferences.

Check DHCP and Router Settings

Ensure your router’s DHCP Server feature is enabled.
Check for duplicate IPs or devices using static addresses in your network.
Temporarily assign a static IP within your router’s range (e.g., 192.168.1.150).
Disable and re-enable your network adapter to refresh the connection.

Warning: Avoid manually assigning an IP that ends with .1 or .255 — these are typically reserved by routers and can cause conflicts.

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