Tech – for Everyone

Tech Tips and Tricks & Advice – written in plain English.

Firewall Causes Connection Problem

Yesterday I received a call for help from someone who simply could not regain their connection to the Internet. My questioning revealed that they had recently followed some advice they had read on the Internet and installed a firewall on their computer. So I’d like to review for you some “firewall basics”, and share how I resolved the problem.

Firewall BasicsFirewall
1) You want a firewall.
2) You want ONLY one firewall running (this was the cause of my caller’s problem). Two will interfere with each other.
3) A firewall’s job is to allow, or deny, incoming and outgoing Internet connections, by instance, and so it must “learn” – from you – what programs to “allow” and which to “deny”. To avoid repeats, you will see a “Remember this answer?” checkbox. Use this feature sparingly.
4) Apple Macintosh and Microsoft Windows come with a firewall. These firewalls are adequate, but not necessarily the “best”. Their main advantage is that they function without hardly ever notifying the user of their existence, or asking questions. (In fact, most people are unaware that they already have a firewall.)
5) Almost every Internet Security “Suite” (every?) comes with a firewall. Also, there are many “3rd party” stand-alone firewall programs available.

Okay. Firewalls are “good”, and you want one. Unless your operating system is very old (older than XP SP2, and OS X) you have one… if it’s an old edition, get one.

When you install a new security suite, or 3rd-party firewall, the vast majority of them are ‘smart enough’ to turn the existing firewall off for you.. but occasionally they don’t — as what happened to my caller. The way to check is to open either Security Center or Control Panel (Sharing Preferences in OS X) and look at the Firewall status — there will be an option to “Enable/Disable Firewall”. Make sure the OS’s firewall (aka “Windows Firewall”) is off. (This simple act restored my caller’s Internet.)

[note: when troubleshooting Internet or file sharing problems, one of the first things to try is turning off your firewall (BRIEFLY). Misconfigurations can cause slow speeds, failures, intermittent failures, and other misc. weirdnesses.]

Today’s free download(s): The two “best” 3rd-party” firewalls are generally considered to be Comodo and ZoneAlarm. If you are not running a “suite” already, and would like a more robust and effective firewall, I would suggest one of those two.
The Comodo firewall is for the more advanced user, and is highly configurable. The ZoneAlarm is for those who simply want the protection and is my reco’ for most users.
Both these firewalls are “chatty” and will query you as they “learn” — Allow this? Deny this?
But this is good — when you see “Trojan.B_dwnldr.exe is trying to connect to the Internet. Allow or Deny?” — you’ll know to click “deny” and that you’ve been infected, and it’s time to get busy.

Copyright 2007-9 © Tech Paul. All rights reserved. post to jaanix

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May 12, 2009 - Posted by | advice, Apple, computers, how to, Internet, Microsoft, troubleshooting, Windows | , , , , , ,


  1. I like your recommendations on the best Firewalls. Comodo and ZoneAlarm are definitely top notch. Best of all, they are free.

    Thank you for this informative article.


    Comment by Anonymous | May 12, 2009 | Reply

    • Anonymous,
      I thank you for your feedback. Each day I provide a link to a free, top-notch program, utility, or service in my “Today’s free link” section.
      Over 600 so far…


      Comment by techpaul | May 12, 2009 | Reply

  2. Very interesting article, Paul. Most people we see don’t use any type of firewall on their PCs and then they wonder why they have issues. Great info and I plan to stop by again!


    Comment by Fix Computer Errors | May 12, 2009 | Reply

    • Thank you for your feedback, and I hope you’ll be a frequent visitor.

      I think, though, that most people have the OS firewall running.. even though they may not know it.
      But then again, there’s far too many people still running Win98/Me… (sigh)


      Comment by techpaul | May 12, 2009 | Reply

  3. TechPaul,

    You know I have to drop by (every day) and get my 2 cents in…

    I thank you for providing such good content that is easy to understand. You should be doing a book or something on this stuff… I’m serious… Those “Dummies” books they push on just about everything these days, have nothing on you. The content and info you provide is right on for the everyday computer user…



    Comment by whatsonmypc | May 12, 2009 | Reply

    • Gee… you just made my day!

      Coming from a man with your talents, that’s a real nice compliment.


      Comment by techpaul | May 12, 2009 | Reply

  4. I’ve experienced this problem with Docomo. Not only my broadband was disconnected- a very tough virus also almost wiped out my pc though I’m not sure how.
    Great post again Paul.


    Comment by pochp | May 12, 2009 | Reply

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