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Windows 7: Intermittent network issue


14 Aug 2010   #1

Windows 7
 
 
Intermittent network issue

Here is my situation.

1 windows 7 ultimate wireless laptop
1 windows 7 home premium laptop
1 windows xp desktop computer


I have setup sharing of folders and it works beautifully. However sometimes when I turn on my laptop, the windows 7 system can no longer see the desktop computer (xp). This is not always the case. Sometimes I shutoff and its working beautifully next day. Weird thing is I have had this issue on another windows 7 laptop too (my older dell). In between shutting down, Im not making any changes (ala firewall,settings, et) on either of the systems.

The way I fixed it is very weird too. If I change my wireless network name in my router, and connect to this new network name, it works beautifully. All Im changing is the network name and trick my computer into thinking its new network. I think this is why it works. I have also tried changing the network location from home to work and vice versa and it does not work. You have to literally trick it into thinking its a new network you are connecting.

When its not working I have checked all the wireless settings and it is the same as when it worked (network sharing on, etc). The two windows 7 systems can always see each other fine.

Any reason on why this is occurring.

My System SpecsSystem Spec
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14 Aug 2010   #2

Win 8 Release candidate 8400
 
 

Quote   Quote: Originally Posted by jpargo View Post
Here is my situation.

1 windows 7 ultimate wireless laptop
1 windows 7 home premium laptop
1 windows xp desktop computer


I have setup sharing of folders and it works beautifully. However sometimes when I turn on my laptop, the windows 7 system can no longer see the desktop computer (xp). This is not always the case. Sometimes I shutoff and its working beautifully next day. Weird thing is I have had this issue on another windows 7 laptop too (my older dell). In between shutting down, Im not making any changes (ala firewall,settings, et) on either of the systems.

The way I fixed it is very weird too. If I change my wireless network name in my router, and connect to this new network name, it works beautifully. All Im changing is the network name and trick my computer into thinking its new network. I think this is why it works. I have also tried changing the network location from home to work and vice versa and it does not work. You have to literally trick it into thinking its a new network you are connecting.

When its not working I have checked all the wireless settings and it is the same as when it worked (network sharing on, etc). The two windows 7 systems can always see each other fine.

Any reason on why this is occurring.
I would bet you are using "homegroup" for networking. It uses IPv6 and is primarily just for win 7 networks. For mixed networks you should be using "workgroup". It uses IPv4 and works better with older machines.

To test it all you need to do is set up a new network connection using workgroup and if it works you can disable IPv6 and kill homegroup.


Let us know if you need help

Ken
My System SpecsSystem Spec
14 Aug 2010   #3

Windows 7
 
 

Wow ZigZag! I have being struggling with this for months and within minutes you fixed my problem. Thank You!

I was not in homegroup though. When I had this setup the xp system did not work. I took your advice and went into the adapter settings and disabled IPV6, and as soon as I did that and reconnected, it worked. I didnt have to go into router, rename my network, and connect again.

THX
My System SpecsSystem Spec
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15 Aug 2010   #4

Windows 7 Ult, Windows 8.1 Pro,
 
 

Most likely IPv6 wasn't the problem and your A/V software is causing this problem to happen. The fact that your problem was intermittent makes this even more likely.
My System SpecsSystem Spec
15 Aug 2010   #5

Windows 7
 
 

Quote   Quote: Originally Posted by chev65 View Post
Most likely IPv6 wasn't the problem and your A/V software is causing this problem to happen. The fact that your problem was intermittent makes this even more likely.
Actually you are right. After I turned on my laptop this morning, its not working any more.

I don't think its my A/V because I have avast anti virus (no firewall). Plus if it is A/V why does the problem solve itself when I connect to "new" network (ALA by renaming it)
My System SpecsSystem Spec
15 Aug 2010   #6

Windows 7 Ult, Windows 8.1 Pro,
 
 

Because that is how these A/V's work or don't work depending on how you look at it.

Often times if you just uninstall the A/V then make sure that networking is working correctly then reinstall the A/V, it will sometimes will pick up your network and make the rules to allow for sharing through the A/V.

These A/V's will automatically create rules that it thinks you need to secure your network. This is why it works one minute and not the next. I suggest that you uninstall your A/V and see if it improves the situation. You might also try going to the Avast forum to get info about how to configure it for sharing with Windows 7.
My System SpecsSystem Spec
15 Aug 2010   #7

Windows 7
 
 

Thanks Chev for your input. I don't think its my A/V but next time (hopefully not) I will uninstall Avast and restart and see if that has any effect.

Before I disabled IPV6 by going to adapter settings and unchecking the box. Supposedly this only disables it temporarily and when you restart it is enabled again (box is still unchecked). To permanently disable it you need to go into registry and disable it that way. I did that and restarted my computer and viola I have access to my XP system.

I will see if this is permanent or just temporary in next few days.
My System SpecsSystem Spec
15 Aug 2010   #8

Windows 7 Ult, Windows 8.1 Pro,
 
 

Unless your router is very very old IPv6 shouldn't be giving you any problems. At least now you will have more options to pursue if unchecking it doesn't work.

As another example of intermittent machines appearing then disappearing due to an A/V problem this post may inspire you. Sometimes cannot see Network Computers

These types of problems with pretty much any A/V have been occuring since day one and the vast majority of the time the A/V software is the culprit.
My System SpecsSystem Spec
15 Aug 2010   #9

Windows 7
 
 

Wow. My computer went into sleep/hibernate mode and upon returning the Windows 7 laptop can no longer see the XP. This problem just won't go away.

Here is what I tried so far:
-Not using homegroup. I set up workgroup that all pcs are connected to.
-I'm using Avast anti virus (not suite). I have completely uninstalled and this doesn't solve problem.
-Disabled IPV6. First time I did this, I got it work right away. But upon shutdown, problem re-occured.
-All the settings are proper because I can see and share files. Just intermittently (when it occurs it happens after shutdown/sleep/hibernate)

How I currently solve problem:
-Sure way of getting to work is to rename my network in router, I get the select network location wizard, and bam it goes from not working to working. If I shutdown/restart there is good chance the network doesn't work.

My guess is the problem is related to how it stores the network location wizard in registry. For some reason it does not keep the right settings after shutdown. I think this why joining "new network" causes it work. Does anybody know where it stores wireless networks in the registry? Atleast in the meantime I can just delete it instead of going through hassle of renaming my network.
My System SpecsSystem Spec
16 Aug 2010   #10

Windows 7 Ult, Windows 8.1 Pro,
 
 

For the sleep mode problem you might try going into the Power Options settings and turn off sleep and hibernate for your network adaptor. You can also try going into Device Manager and turning off the network adaptor's ability to turn itself off in the properties windows of your network adaptor. Certain drivers can't deal with these functions very well and they tend to cause problems.


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