Network Diagnostics

"The internet is broken!" — a page to find out which part of the internet is broken, and fix it.

What it does

When your PC can't connect, the problem could be a dozen different things: your Wi-Fi adapter, your router, DNS, DHCP, a proxy setting, the ISP, or a specific website. Network Diagnostics runs through all of the above in a few seconds and tells you exactly where the chain breaks. It also bundles the repair commands technicians reach for — flush DNS, reset Winsock, renew DHCP — into clickable buttons.

The diagnostics panel

IP Address — your local IP and whether you got one from DHCP.
Default Gateway — your router's address. If this is blank, you never joined the network.
DNS Servers — the servers that translate domain names into addresses.
Internet Connectivity — TuneBit pings well-known public hosts. Green means you reached them.
DNS Resolution — TuneBit looks up a handful of known domains to verify DNS itself is working.

The repair buttons

Flush DNS Cache

Clears Windows' cache of domain lookups. Fixes "this site won't load but works on my phone."

Reset Winsock & TCP/IP

Rebuilds the network stack. If your Wi-Fi works but browsers don't, or vice versa, this often resolves it. Reboot afterwards.

Set DNS to Google/Cloudflare

Overrides your ISP's DNS with 8.8.8.8 / 1.1.1.1. These are usually faster and more reliable. Handy when DNS Resolution above comes back red.

Release/Renew DHCP

Asks your router for a fresh lease. Fixes "limited connectivity" after waking from sleep or moving between networks.

Reset Proxy

Clears any proxy settings. Malware sometimes sets a rogue proxy to intercept your traffic; resetting kills that.

Reset Firewall

Rebuilds Windows Firewall rules from defaults. Use only when the firewall has gone truly sideways — it will forget any custom rules you've added.

Toggle IPv6

Disables (or re-enables) the IPv6 stack. Older routers and some VPNs misbehave with IPv6 enabled.

Fix Network Discovery

Re-enables network discovery and file-sharing services so your PC can see (and be seen by) other devices on your home network.

Reset All

Runs the whole suite in sequence. If you have no idea where the problem is, this is the hammer. Reboot after.

A good troubleshooting order

Refresh the diagnostics panel. Note which items are red.
If IP Address is blank: Release/Renew DHCP. Still blank? Your problem is between the PC and the router — check cables, Wi-Fi password, adapter driver.
If Internet Connectivity is red but DNS is green: Reset Proxy, try a different website.
If DNS Resolution is red but Internet is green: Flush DNS, then Set DNS to Google.
Anything more stubborn: Reset All, reboot, try again.

Before blaming Windows: If every device in your house can't reach the internet, it's your router or ISP, not this PC. Unplug the router for 30 seconds and try again before running resets here.