Home user
Connected but nothing loads
The path test passes the gateway and fails at DNS; one click switches to a working resolver and the Doctor shows the ISP's resolver has been failing since 19:40.
Coming SoonFree editionInternet & connections
Connection Doctor
When the internet stops working, find out where in two minutes: the PC's adapter and driver, the Wi-Fi link, DHCP and the address it got, the router, DNS, a captive portal, the ISP's line or the website itself, tested in order like a plumber tracing a pipe, with the broken step named in plain words, the fix offered in one click, and a history of every drop so an intermittent fault finally gets caught.
The problem
"The internet is not working" is the most common PC complaint and the hardest to pin down: the Wi-Fi icon says connected, websites time out, and nobody knows whether it is the laptop, the router, the ISP or just one site. Windows' troubleshooter resets the adapter and gives up; people reboot everything in the wrong order, call the ISP, and are told it is their PC. Intermittent drops are worse, because by the time anyone looks, it works again.
Features
- Tests the whole path in order: adapter and driver, link and signal, DHCP lease and IP address, gateway reachability, DNS resolution, captive-portal detection, the ISP's first hops, then a few well-known sites, and stops at the first failure with a plain-words diagnosis
- One-click fixes for the common causes: renew the lease, flush DNS, switch to a working resolver, reconnect Wi-Fi, restart the adapter, open the captive-portal page, or reset the network stack, each explained and reversible
- Keeps watching after the fix: a background probe every few seconds logs every drop with its time, length and the step that failed, so a connection that dies every evening at 9 shows a pattern
- Tells you who to call and what to say: when the ISP's side is at fault, a one-page report with timestamps, traceroutes and loss figures that support staff cannot dismiss
- Knows your home: remembers the router, resolvers and typical speeds so changes (a new DNS server, a different gateway, a new device acting as router) are flagged
- Hands off: slow but working goes to Wi-Fi & DNS Doctor, security worries to Home Router Guard, and a dead line to Connection Failover to keep you online
How it works
Path tests
- Adapter state and driver age from SetupAPI; link speed and signal from the WLAN API
- DHCP lease details, APIPA detection (169.254 addresses), duplicate gateway detection
- ICMP and TCP probes to the gateway, the ISP's first hops and anchor sites; DNS over UDP, TCP and DoH compared
- Captive portals detected the way Windows and phones do, then opened in an isolated window
History and patterns
- Lightweight probes logged to SQLite with the failing step
- Timeline view with drops, their length and what else happened (sleep, driver update, roaming between access points)
- Weekly summary and a Telegram alert when the line is down for more than a minute
Fixing
- Fixes run as journaled jobs with undo where the change persists (DNS, profile settings)
- Network stack reset only as a last step, with a restore of the previous settings
- Optional AI explanation of a confusing traceroute, using your own key or a local model
Who it is for
Family
Drops every evening
A week of probes shows the line drops for 40 seconds at 21:05 every night; the report with timestamps gets the ISP to replace a faulty line card.
Traveller
Hotel Wi-Fi that will not connect
The Doctor detects a captive portal the browser never showed and opens the login page in an isolated window.
Benefits
- Know in two minutes whether it is the PC, the router, the ISP or the site
- Fix the common causes in one click
- Catch the drop that only happens at night
Built to be trusted
- Every fix is explained first and journaled; settings changes can be undone
- Background probes are tiny and back off on battery and metered connections
- The report states what was measured and when, never a guess
Good to know
A PC can only see its own side of the line; when the fault is inside the ISP's network, the Doctor can prove the outage and its timing but not fix it. Routers differ, so router-side fixes are guidance, not clicks. Windows' own troubleshooter is free and sometimes enough; the value is the ordered diagnosis, the history that catches intermittent faults and the report that the ISP has to take seriously.
Under the hood
For technical readers
- IP Helper, WLAN and SetupAPI
- In-process probes and traceroute
- SQLite history; Alerts and Reports
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Questions now? Contact our team.