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Old 11-17-2011, 10:32 AM   #16
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Odd firewall - LAN issue


Thanks RedHelix, I had not heard of nMap before. So you are saying that I can just turn off all client firewalls and use the wireless router as the firewall for the LAN? The internet comes in via cable modem --> wireless router --> client PC's. I'm not at that office right now but will definitely give it a try when I get there. Thanks!

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Old 11-17-2011, 11:47 AM   #17
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Odd firewall - LAN issue


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Originally Posted by Oh-Fudge View Post
Thanks RedHelix, I had not heard of nMap before. So you are saying that I can just turn off all client firewalls and use the wireless router as the firewall for the LAN? The internet comes in via cable modem --> wireless router --> client PC's. I'm not at that office right now but will definitely give it a try when I get there. Thanks!
It's pretty much up to you, all I'm saying is a lot of sysadmins just turn off client-side firewalls to save a lot of hassle, and let the network appliances do the work.

The wireless does make it a little tricker, though.

If you can't figure things out with nMap and you do decide to shut off the client-side firewalls, then it goes without saying that you should have very strong wifi encryption + MAC address filtering to keep things secure. I'm also not sure what model router you have, but I always default to recommending something with a halfway-decent firewall, like a Sonicwall or (if you have some money to blow) a Cisco ASA 5505
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Old 11-18-2011, 03:19 PM   #18
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Odd firewall - LAN issue


It's a Linksys WRT54.
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Old 06-12-2012, 01:12 AM   #19
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Odd firewall - LAN issue


Interested to hear how this turned out.
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Old 06-12-2012, 09:41 AM   #20
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Wow, this is an old thread. Hi Evstarr, the forum sent me an email telling me I had a new post in this thread. To answer your question, my firewall is working again but I'm not sure why. I did have an issue with the Window$ Security Center having gone missing, but this was long after the firewall problem occurred, so they weren't related. I found a fix to restore my Security Center using the reg key from a working PC, the key was "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servi ces\wscsvc".

When my Security Center was fixed, now my firewall works and does not block my LAN computers like it was doing before. I'm sure my Security Center problem was probably a virus of some sort. I have AVG antivirus which sucks, but is better than nothing and is free. So, it may have been a Security Center issue, or something else that magically fixed itself like PC's do sometimes. I'm sure it is all part of Bill Gates master plan to take over the world.....
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Old 06-16-2012, 01:10 AM   #21
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Odd firewall - LAN issue


Ah the things that keep me up a night. Lol. Glad you got it sorted. For some reason I just needed closure on this one!

Thanks for taking the time to update this old thread!
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Old 07-17-2012, 11:36 PM   #22
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Odd firewall - LAN issue


Would never suggest you buy an Apple. If ever there was a person that epitomized and glamorized intellectual property theft and taught a couple generations it was alright to steal it? Steve Jobs.

Now speaking of other pieces of work. I have spent the last few weeks trying to help a friend sort out some Microsoft quirks that made no sense. After much fussing and fuming we came to find out that when the new Skype Dialer was tack welded on to Microsoft products with a rusty coat hanger and bad acetyline mix it wacked all kinds of software settings. It is a long shot but I wonder if it is messing with your firewall. In our case it was effecting formatting of copied text in Word. Go figure.

The solution was to upgrade Skype.
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Old 07-18-2012, 10:06 AM   #23
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My knee-jerk reaction is to say turn off the firewall. A lot of businesses disable it through group policy to avoid hassles like the one you are describing, and to just let the layer 3 firewall appliances do the work.
I generally rely on my layer 3 exclusively as well. Windows firewall is bad enough to configure and the 3rd party ones always seem to be a nightmare. This is from experience doing tech support for a small business application I support. Customers have all kinds of crazy firewalls on the desktop computers preventing the application from communicating with the server computer.
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Old 09-02-2012, 04:14 PM   #24
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thanks Ross, yes I have reset the router and done all of the basic stuff, reset the "exceptions" in the firewall, etc. I know Windoze firewall is weak, but I don't want to mess up my network any further by installing 3rd party firewalls. I tried Comodo and my network didn't work at all. And in my office work comes to a standstill without the network.

I have seen 'bleepingcomputer.com', it often has been helpful, great website.


HEY! Just noticed this is my 100th Post! Woop, woop!! (I have to get a life...)

Actually windows firewall isn't weak at all. A collegue of mine put a honey pot out on the internet and was wondering why he wasn't getting anything.

This thing was fully unpatched, had legacy software that was open to attacks but couldn't figure out why he wasn't getting hits.

Turns out windows firewall was on! After he turned it off the packets started pouring in

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