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Instructional tutorials he's written have been linked to by organizations like The New York Times, Wirecutter, Lifehacker, the BBC, CNET, Ars Technica, and John Gruber's Daring Fireball. The news he's broken has been covered by outlets like the BBC, The Verge, Slate, Gizmodo, Engadget, TechCrunch, Digital Trends, ZDNet, The Next Web, and Techmeme. Beyond the column, he wrote about everything from Windows to tech travel tips. He founded PCWorld's 'World Beyond Windows' column, which covered the latest developments in open-source operating systems like Linux and Chrome OS. He also wrote the USA's most-saved article of 2021, according to Pocket.Ĭhris was a PCWorld columnist for two years. Beyond the web, his work has appeared in the print edition of The New York Times (September 9, 2019) and in PCWorld's print magazines, specifically in the August 2013 and July 2013 editions, where his story was on the cover. With over a decade of writing experience in the field of technology, Chris has written for a variety of publications including The New York Times, Reader's Digest, IDG's PCWorld, Digital Trends, and MakeUseOf. Chris has personally written over 2,000 articles that have been read more than one billion times-and that's just here at How-To Geek. They don't give an attacker access to a system, and a securely configured system can certainly withstand a full port scan with no harm.Ĭhris Hoffman is the former Editor-in-Chief of How-To Geek.

But they're just a tool that lets attackers find ports that may be vulnerable to attack. Port scans are a basic, bread-and-butter security tool when it comes to penetrating (and securing) computer systems. For example, a port scan could scan a smaller range of ports, or could scan the full range of ports over a much longer period so it would be more difficult to detect. That's why some port-scanning techniques work differently. If no packet is received, the scanner knows that the port must be open.Ī simple, port scan where the software requests information about each port, one by one, is easy to spot. Network firewalls can easily be configured to detect and stop this behavior. If it does, the scanner knows there is a remote system at that location, and that one particular port is closed on it. Other types of scans involve sending stranger, malformed types of packets and waiting to see if the remote system returns an RST packet closing the connection.

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