Win 7 preventing internet access on Vista machines

Trevor · Nov 20, 2011, 12:24:43

I'm hoping that someone may be able to help where TP-Link customer service failed - dismally!
I replaced my Netgear router with one from TP-Link a while ago and whilst it has stopped the problems with loss of connection I have a new problem that is driving me nuts.

I have 2 desktop and 1 laptop connected. The laptop and 1 desktop are running Vista and will both access the internet at the same time without any problems. However if I run the desktop with Win 7 at the same time as either of the others, I lose the connection to the Vista machine. I only ever run 2 machines at the same time. The laptop will not connect on either Ethernet or wireless.
I contacted TP-Link customer service and they suggested that I had a virus/trojan on the Win 7 PC or that I should set a static IP address. Since I have no confidence in them and absolutely no idea how all this works, I am hoping that someone here can help - preferably in words of 1 syllable.
Thanks in advance.

Rik · Nov 20, 2011, 12:29:14

It doesn't make any sense to me, Trevor. I avoided Vista, but I can run XP and 7 together with no problems. Do you have them computers networking, eg sharing files or printers, or do they just share the 'net connection.

Lona · Nov 20, 2011, 12:54:47

I have a desktop running Vista, and another running XP with a laptop running Win7. They're all networked and connect fine but everytime I download and install Vista service pack 2 the Vista machine loses connection.

I have to uninstall service pack 2 to regain the network connection. After many attempts I decided to leave things as they were as I've never been able to solve the problem.

I don't know if this helps.

Trevor · Nov 20, 2011, 13:13:48

Quote from: Rik on Nov 20, 2011, 12:29:14
It doesn't make any sense to me, Trevor. I avoided Vista, but I can run XP and 7 together with no problems. Do you have them computers networking, eg sharing files or printers, or do they just share the 'net connection.

Hi Rik,
The Vista PCs are networked, but not the Win 7 machine.
I remembered after my first post that my wife has a Netbook running Win 7 Starter, so I tried to run that at the same time as the other Win 7 PC. It lost the connection too, so it must be something to do with the Win 7 Desktop machine, but I haven't a clue what.

Lona - thanks for your suggestion, but given that the Vista PCs are working nicely together, I don't want to do anything that may affect that as well.

Rik · Nov 20, 2011, 13:16:03

It does make me wonder if Lona has the answer, Trevor. Could you try the old router to check?

Steve · Nov 20, 2011, 13:17:46

Not sure Trevor how you've got your machines networked,as you say the Win 7 machine isn't,normally all 3 machines connect to the router via a wired or wireless connection

If the Win 7 is 'kicking' the other machines off, I would expect some IP address conflict warnings appearing on either machine. I can see no harm in setting a static IP address for each machine to see if this solves the problem

http://www.tplink.com/en/article/?articleid=116

Trevor · Nov 20, 2011, 13:28:37

Quote from: Steve on Nov 20, 2011, 13:17:46
Not sure Trevor how you've got your machines networked,as you say the Win 7 machine isn't,normally all 3 machines connect to the router via a wired or wireless connection

If the Win 7 is 'kicking' the other machines off, I would expect some IP address conflict warnings appearing on either machine. I can see no harm in setting a static IP address for each machine to see if this solves the problem

http://www.tplink.com/en/article/?articleid=116

Thanks Steve, II'll give it a try. - Watch this space.

Trevor · Nov 20, 2011, 16:39:29

Quote from: Rik on Nov 20, 2011, 13:16:03
It does make me wonder if Lona has the answer, Trevor. Could you try the old router to check?

Hi Rik,
Sorry I missed your reply. WHen my old router allowed me to access the internet, it would do so from any combination of PCs. I'm pretty sure SP2 was installed at the time.
One thing I have noticed is that the DNS Servers are shown as 192.168.1.1 when I do ipconfig on each PC. Is this right as IDNet show something different. (I suspect this question will really show my ignorance!)

Steve · Nov 20, 2011, 16:47:29

That's the computer picking up the DNS from the router. You can change the DNS settings from automatic at both the router and computer level.

Steve · Nov 20, 2011, 17:00:38

IDNet DNS are 212.69.40.3 and 212.69.36.3

Trevor · Nov 20, 2011, 17:08:05

Quote from: Steve on Nov 20, 2011, 16:47:29
That's the computer picking up the DNS from the router. You can change the DNS settings from automatic at both the router and computer level.

Thanks Steve.

Trevor · Nov 30, 2011, 13:53:49

Just to let you all know that applying a static IP address didn't work. I even tried disabling the adapter on the Win 7 PC to see if that would allow the Vista machines to access the internet, but that didn't work either.
I guess I'll just have to work round it.
Thanks for all your replies.

Technical Ben · Nov 30, 2011, 17:16:41

Hmm. Could a hardware fault be causing noise on the line from the Win 7 machine?

Glenn · Nov 30, 2011, 18:20:33

Trevor, is this any help? http://www.howtogeek.com/howto/9040/how-to-share-files-and-printers-between-windows-7-and-vista/

Lona · Nov 30, 2011, 22:35:01

I've been thinking more about your problem and sometimes windows firewall prevents setting up a new network connection.
Try disabling windows firewall temporarily and see if that helps.

As I said I have Xp, Vista and Win7 all networked and with internet connections running on all three at the same time.

I would mention that the laptop which has win7 connects wirelessly while the other two use ethernet.

Steve · Dec 01, 2011, 08:48:06

Perhaps I misunderstand the situation here and I can't get my head round it at all. What I understand is that if the Win 7 machine is connected via the router to the internet the 2 vista machines lose their internet connection..

Can you from a dot prompt display the result of ipconfig /all.

Trevor · Dec 01, 2011, 08:57:50

Quote from: Technical Ben on Nov 30, 2011, 17:16:41
Hmm. Could a hardware fault be causing noise on the line from the Win 7 machine?

I'm not sure what I would do to verify this?
I have ruled out the router as the problem. I had a loaner from IDNET (Thanks again) and the problem remained.
Lona - I'm using Norton Internet, so Windows firewall is disabled. I've looked at the various settings in Norton but couldn't find anything obvious that could cause the problem.
Glenn - Thanks for the link. I've checked the settings and they all look fine.
Steve - Yes, that's right. As soon as I switch on the Win 7 PC the connection is lost on the Vista machines.
I'll recheck the IPConfig results again. TBH I've gone through so many things I've forgotten most of what I saw.

Thanks again all for your time.

Glenn · Dec 01, 2011, 09:07:44

What happens if you switch on the Win 7 PC first, I presume the Vista PC's then can't connect to the internet?

Can all the PC's see each other on your little network?

How many networks in the Network and Sharing Centre does Win 7 see, just your home one or an unidentified one too?

http://www.w7forums.com/multiple-networks-block-internet-connection-t1440.html

Trevor · Dec 01, 2011, 11:23:15

Quote from: Glenn on Dec 01, 2011, 09:07:44
What happens if you switch on the Win 7 PC first, I presume the Vista PC's then can't connect to the internet?

Can all the PC's see each other on your little network?

How many networks in the Network and Sharing Centre does Win 7 see, just your home one or an unidentified one too?

http://www.w7forums.com/multiple-networks-block-internet-connection-t1440.html

That's right. It doesn't matter in what order they are switched on.

Trevor · Dec 01, 2011, 11:40:32

I don't believe it. I've just switched on the Win 7 machine again to check the networks as Glenn suggested and this time I can access the internet on the Vista laptop!
I didn't do anything today that would resolve the problem, so I don't know what is going on. Not that I'm complaining. As long as it continues to work, I'll be a happy bunny.

Thanks again to everyone that has taken the time and trouble to help me in my hour(s) of need.

Rik · Dec 01, 2011, 11:46:27

Glad you've got there, Trevor. Of course, will that still be true tomorrow?

Trevor · Dec 01, 2011, 12:46:43

Quote from: Rik on Dec 01, 2011, 11:46:27
Glad you've got there, Trevor. Of course, will that still be true tomorrow?

Thanks for that Rik!!!!!!!!!!!!!!!!!!!!!!!!!!!

Technical Ben · Dec 01, 2011, 15:07:43

I've always found Windows and it's assignment of IPs to mess up all the time. I remember it being murder getting a two XP machines to connect and file share over a crossover cable network. :/

Rik · Dec 01, 2011, 17:00:11

Quote from: Trevor on Dec 01, 2011, 12:46:43
Thanks for that Rik!!!!!!!!!!!!!!!!!!!!!!!!!!!

Trevor · Dec 25, 2011, 09:36:40

Rik - I hope Father Christmas gave you a miss this year!

The problem came back again. I've scoured the web for suggestions without any luck. I wonder if it could be something to do with Norton Internet Security? I've checked the settings and they seem OK.
The REALLY odd thing is that I can occasionally connect for a couple of minutes, but lose the connection again.
I get really frustrated with things like this, to say the least.

Anyway, I wish everyone here (except Rik

) a very merry Xmas and a happy and prosperous New Year.