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COMODO Internet Security

COMODO Internet Security
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COMODO Internet Security offers 360° protection against internal and external threats. It  combines a powerful Antivirus protection, an enterprise class packet filtering firewall, and advanced host intrusion prevention system called Defense+.

COMODO Internet Security protects your PC from malicious software and Hackers. Best of all is FREE! CIS 2019 will help you detect and remove viruses, Trojans, also other malicious software and hackers. In one easy to use bundle that won’t slow down your computer.

COMODO Internet Security sees a major leap forward in security and usability with the addition of the new sandbox feature – isolated operating environment for unknown applications. Under default settings, unknown applications will be automatically sandboxed. So that they cannot make permanent changes to other processes, programs or data on your ‘real’ system.

Comodo Internet Security Features:

  • Antivirus –  automatically detects and eliminates viruses, Worms and Trojan horses.
  • Firewall – constantly defends your system from inbound and outbound Internet attacks with a highly effective packet filtering firewall.
  • Defense+ is a rules based intrusion prevention system. It protects your critical operating system files from malicious processes, internal attacks and blocks unknown malware before it ever gets a chance to install.

Comodo Internet Security

Alerts you whenever potential malware attempts to attack or gain access to your system. The alerts are displayed as pop-ups at the right hand corner of your screen. It allow you to block the unrecognized activities, processes and connection attempts of running applications. CIS now even protects against ‘drive-by-download’ buffer overflow attacks.

Comodo Antivirus

Leverages multiple technologies, including Real-time and On-Access Scanning, On Demand Scanning and a fully featured Scan Scheduler. They can immediately start cleaning or quarantining suspicious files from your hard drives, shared disks, emails, downloads and system memory.

Comodo Firewall

Offers the highest levels of security against inbound and outbound threats. Also it stealths your computer’s ports against hackers and blocks malicious software from transmitting your confidential data over the Internet. The Firewall Task Center allows you to quickly and easily configure all aspects of the Firewall.

Advanced Features:

  • You can install the Antivirus as a standalone
  • Or install the Firewall as a standalone
  • Install both Firewall and Antivirus

Changes in COMODO Internet Security


  • The welcome page should close after clicking the activate button
  • When cis is activated we should not show welcome dialog
  • CIS will not display register user account when activation

Changes in COMODO Internet Security


  • WSL 2 can not work when install CIS
  • Solitaire can not run in sandbox
  • System restore is restoring the registry issue
  • cmdvirth can be stoped
  • Support jumbo frames in fw
  • Setting allow contained applications access to the clipboard does not work
  • Fixed BSOD cased by cmderd on 32 bit OS

Changes in COMODO Internet Security 2020

New Features

  • CIS going to use reduced(light) database in default. Option added to updates section who wants to change database to regular one.


  • Cloud backup
  • File submission problems


  • Ipv4 loopback filtering remove problem
  • No welcome screen at startup
  • File list export still saves when canceled
  • Issue in switching configurations
  • Display wrong scan priority
  • Desktop shortcut doesn’t change after product upgraded to AV Advanced
  • Translation of “Show Files” added
  • Scan exclusions’ translation added
  • Malwares detected by manual scan removed instead of quarantined
  • Web filtering doesn’t accept valid string (e.g. “**”)
  • Tray icon status problem
  • A file will be trusted which blocked by Viruscope and unblocked by user.
  • Product name is not updated in programs & features after activating new license key.
  • GUI window rendering bug
  • False unrecognized files after running “Autorun Analyzer” from KillSwitch
  • Wrong activation of warranty log
  • Option “Go to folder” not available for Firewall and Hips rules
  • Unrecognized non-executables file is not displayed in File List when it is opened by widget
  • Network zones ip copy&paste issue
  • Microsoft Silverlight alert in Run Virtual Desktop
  • “Ignore once” action in web filtering will be logged.

Changes in COMODO Internet Security 2020


  • Migrated virtually all HTTP URLs to HTTPs.
  • Folder Protection


  • Upgrade over install doesn’t work
  • Https website filtering no longer works on Chrome 78
  • Chrome crashes in Containment
  • CIS creates error while unplugging USB
  • Uninstallation & Installation failed
  • Uninstallation of Comodo KillSwitch and Cleaning Essentials
  • Freezes in Win10 build 1909/1903

Homepage –

Supported Operating Systems: Windows 7, 8, 8.1, 10, 11 (32-bit, 64-bit).

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11 Comments on COMODO Internet Security

  • Gravatar


    this is prithvi (as my old account not working here) so in above comment what ever i said abt comodo intenet security regrading its merits..i take it back... this antivirus is ok not so good..Its scanning way is really makes urs pc slow..bad antivirus Best is microsoft security essential

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    i was pissed with that kaspersky internet security 2012,,even it clean the virus the pop-up windows of virus warning always up there,,and when asked abt this they(kas team) said re-install kis again or else they will say urs operating system is corrupt..and when you uninstall kis then be ready for more headache,bloody it screw up my registry entries,search option was gone, WMP showeing error...after i register my all .dll files everything got normal.Just check the kaspersky forum so much of problem people faceing,and they have only one answer re-install or format urs pc.. wat a crap.
    huuu bye bye boreing slow net surfer KASPERSKY...

    full protection..even they have online chat support....hats off to them

    one of the best internet security suit i will say :))))))

  • Gravatar


    Here is the official link to get legal Comodo Internet Security 6 pro version for free(1 year)

  • Gravatar


    About the free 1 year promotion of CIS PRO. It doesn't have TrustConnect. The only difference is Geekbuddy and Live PC Support which are useless for me. Why call it PRO if it's the same as the FREE version?

    The software rocks especially the firewall, the anti-virus engine had major improvements but in my experience it slowed down my system a bit. So I'm just using the firewall with another anti-virus.

  • Gravatar


    Totally agree that it's the best security in gathering AV and IS softwares but tell me that if this version absolutely free as like as the COMODO Internet Security Premium edition ?

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    Very good firewall (And free)

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    I've used Comodo for several years now and never had an issue with it... and it turned out to be the only product I could configure to give me a 'Perfect' stealth reading after testing several other renowned products.

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    I will try this one, since Avira Premium Security started to crash. I`m satisfied so far. No computer overload and the firewall looks like working very well. Just did the grc test. I`m completely invissible on the Internet.

  • Gravatar


    Among products tested against 84 tests, Comodo Internet Security 3.12.111745.560 and PC Tools Firewall Plus lead the challenge with the perfect 100% score. Online Armor Premium is close to them with 99% score, closely followed by Kaspersky Internet Security 2010 with 96 %. The Excellent protection level has been also reached by Outpost Firewall Free 2009 6.5.2724.381.0687.328 with 93 %, Outpost Security Suite Pro 2009 with 92 % and Online Armor Personal Firewall Free.

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    I didn't say something's wrong with KIS, I said due to my preferences I would go for CIS Firewall, as I personally don't like "suites".

    You can check matousec website for best firewalls comparison, and you'll see KIS is rated pretty high, although a bit below CIS :)


  • Gravatar


    The best free internet security suite.

    The firewall and the HIPS (or Defense+ as Comodo names it) are top quality and the antivirus engine is descent (for a free one that is) but it needs more work, because in my experience I got some false alarms from the antivirus like detecting games and other programs as viruses (Guild Wars, Still Life, Pinnacle Game Profiler) other than that its OK. is an affiliate partner that provides software selling with discounts and coupons, also software updates and downloads