Whenever some program messes with the main internet connection or a malware is only halfway removed, the most likely outcome is that the entire DNS system blows up. The commands to try to restore its functionality are well documented, but if you don't have internet access in the first place... the ideal is to add an offline tool that does the dirty work. That's when Clean_DNS comes into the equation, which verifies and repairs the DNS on your computer without consoles or strange commands.
It's a classic problem we'd like to see solved for good, but it persists across all editions of Windows. The DNS configuration changes, its cache ends up with corrupt data, malware in its many forms has a feast... we lose the connection. Turning the computer off and on doesn't do anything in this case, and it doesn't matter what technical support recommends on the other end of the phone. Windows supposedly has several tools to self-repair the connection, but I can hardly remember any case where they've worked. That's why the concept of a "maintenance USB drive" is so important, with offline and portable programs that don't rely on the network to work. One of them is Clean_DNS.
Verify and Repair Your DNS with Clean_DNS
The main options of Clean_DNS are two: Control and Repair. Control presents a general report on the state of the DNS configuration on the computer, the version of the essential libraries (to check that they are from Microsoft and weren't replaced), the registry entries, and a list of the most popular DNS services. The program seems to have some bugs in its interface, and every time we get that report we have to close it completely. Repair does exactly what we imagine: it purges everything related to DNS, and restarts the computer to apply the changes.
The last option is IP Verify. If you find any strange IP address in the report, this button works as a kind of "whois" that opens the browser and looks up data about that address on the Web. Finally, Uninstall removes Clean_DNS from the system tray. The software was updated a couple of days ago, doesn't need installation, and its VirusTotal score is perfect. If DNS refuses to respond, you won't lose anything by trying Clean_DNS.
https://old.neoteo.com/simple-dnscrypt-excelente-herramienta-para-proteger-tus-solicitudes-dns/
