Re: Trying to Figure out What's OK and What to Block

Fishlips wrote:
On Sat, 11 Mar 2006 02:48:01 GMT, Duane Arnold <NotMe@xxxxxxxxx>
wrote:


Fishlips wrote:

On Fri, 10 Mar 2006 21:59:30 GMT, Duane Arnold <NotMe@xxxxxxxxx>
wrote:



Fish lips wrote:


I have a Win Xp computer that I can't seem to get working right on the
internet.

I have a broadband connection and a router. The other computer
connected to the same router works fine.

I had the old version of Kerio (2.1.5) on both, I switched to the free
Tiny firewall on the problem computer just to see if the firewall was
the problem.

The personal FW is the problem.



When I first start it it works fine. After a while I cannot connect
to anything on the internet unless I reboot.

I am trying to set up the rules so that I block everything that
doesn't need to connect to the internet.

For what? It's a worthless endeavor. The machines are behind a NAT router and it's not a wireless NAT router.


Mine is also wireless.



But some line to use a personal FW behind the NAT router and there is no harm and no foul, if it's not getting in the way.


I prefer to use the personal FW to control apps as I explain to Kerodo
below.

Yeah, I read that and it may work for the most part as long as you don't *boot* the machine as malware can get to the TCP/IP connection first and beat it and its App Control and be done before the 3rd party personal FW can even start to get there and stop it.


One thing I am not sure of is something identified only as "SYSTEM"
which looks like it wants to send and recieve UDP traffic to the
router and send and recieve to and from the other computer.

If you didn't have the PFW sitting there whining about nothing behind the NAT router, then it would be no concern to you.



Could blocking this be causing me to lose the internet connection?

Who knows? If the PFW is disabled behind the router does the machine have an Internet connection?


At the point that the internet connection is lost, turning off the
firewall does not restore it. Only a reboot will.


So why don't you do an IPconfig /release and Ipconfig /renew to see if the machine can access the Internet without rebooting the machine?


I decided to just let "SYSTEM" do its thing, and I am also allowing
the Netbios stuff through because it is so persistant in wanting to do
that, and so far it has been running for a couple of hours and is
still connected. So I think that was the problem. Time will tell.

Oh damn, it just crapped out again.



And what machine is this happening wired or wireless as it seems there maybe a problem with the NIC dropping the connection and could be defective in someway.


Wired.

Maybe, you should swap out the NIC on the machine and see if the problem follows.





I do not use the router as a way to network the two computers. I only
use it to allow each computer onto the internet. So there is no
logical reason for the computers to be talking to each other.

They are trying to talk to each other due to the simple fact that they are connected to the router. The router is the gateway device that allows the computers to access the WAN (Wide Area Network)/Internet and provides the plumbing that's going to allow the machines to see and talk to each other on the LAN (Local Area Network).



Usually
it says something to the effect that one computer wants to send a UDP
datagram to the other computer on port 137. Should I allow this?


Hey, other machine on the LAN I have discovered that you're on the LAN I see you. *Other machine on the LAN* -- yeah I discovered you and I see you too. Both machines reply okay dokey will talk again later.

Duane :)




I also read some other parts of your other post about some MS software you didn't want phoning home, which the NT based O/S can be configured to not allow something to run until you configure the O/S to let it run and should be configured through the O/S and not the PFW.


I don't know how to do that.

By using NTFS and going to the exe or dll you don't want to run using Explorer to access the directory the file is located and setting its NTFS property to not *Execute*.



In addition to this, I had a Linksys wireless NIC driver that was phoning home and what I did was found out what part of the O/S services the driver was piggy backing off of and shutdown the unneeded service that the driver was sneaking out on and is where I needed to go to and not try control something with Application Control in a PFW.

The buck stops with the O/S and no where else and is the entity that should be doing the controlling.


I agree. I just wish I knew enough to configure it properly.


Well you could get a book from the library or buy one that's going to allow you to better understand and control the XP NT based O/S.

The link can get you started on some of the things to secure the O/S a little more.

http://labmice.techtarget.com/articles/winxpsecuritychecklist.htm

You can be compromised by someone joining your wireless network and coming after the machines. The link may help a little bit, along with paying a visit to alt.Internet.wireless.

http://netsecurity.about.com/cs/wireless/a/aa112203_2.htm

You can use Google to find how to(s) and better understand the tools like Process Explorer to find the bottom line as to what processes are running on the machine and what hidden process is using a process.

Long

http://www.windowsecurity.com/articles/Hidden_Backdoors_Trojan_Horses_and_Rootkit_Tools_in_a_Windows_Environment.html

Short

http://tinyurl.com/klw1

Duane :)

.

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