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Windows 7: Remote PCs inaccessible by name shortly after mapping

27 Jan 2010   #1
Curve

Win 7 x64
 
 
Remote PCs inaccessible by name shortly after mapping

I have a PC that was completely wiped, and a clean install was done with Win 7 x64.

While it was running XP SP3, there were no problems whatsoever, but now on Win 7 x64, I'm finding that remote machines become inaccessible by name after a short time of having them mapped.

For example, I have a drive permanently mapped to a server share. Upon boot, I can access it just fine. But within 1-5 hours, it becomes inaccessible. At that point, I cannot access that entire server at all by name. I can still access it by IP address, but not by name.

If I map a drive to a remote machine using its IP address (i.e. \\192.168.1.1\c$) and leave it running, after a while, I can't access this either. When this happens, I *can* still ping the remote machine by IP, but if I try to map another drive to it, I get the same error I'd normally get - "The specified network name is no longer available".

Rebooting allows me to access it once again, but like before - only for a short while.

If I try to access a network share of a different machine, I can do it on and off all day - meaning that if I map a drive to it, do my business, then disconnect the drive - I can usually go all day without problems. But if I leave the drive mapped, the same thing will happen to this machine as it does to the server.


My first suspect was my firewall application, but uninstalling it had no effect. However, I discovered that by uninstalling my AV software (Kaspersky), this problem is *mostly* fixed. The server drive stayed mapped and accessible all day without dropping. I thought the problem was fully fixed, but when I tried to map a drive to the other remote machine for the first time after the PC had been running for about 8-10 hours, it was inaccessible by name.

So, the AV software definitely affects the issue - but it may not be the sole source of it. I also tried installing a different AV app (Avast), and discovered the exact same problem as I had with Kaspersky AV, so it's not a specific app, it would appear, but something that AV apps do in general (or at least, these two). But again, this covers about 90% of the issue, not all of it.


While I was researching this issue, I came across this thread:

A Windows 7 network share dropout problem


The symptoms of the problem were almost identical to mine, but a bad router seemed to be unlikely to be the source of my problem, since:

1. I don't use a router, but an unmanaged switch.

2. Even when the named access (or even IP named access) dies, I can still ping the IP of the machine.

3. Uninstalling the AV software had a significant impact on this issue.


*However*, that thread did give me an idea to test.

I wrote a script that copied and deleted a small text file to the server every ten minutes, to keep the connection alive. And it worked! Letting that script run keeps the machine accessible long after it normally would have become inaccessible (I once again, have Kaspersky installed). I'm thrilled to have this workaround, but obviously I'd like to get the root issue resolved.


So, to answer the obvious, yes I'm using the latest drivers for my NIC (Intel Pro/1000 PT), and yes they are (at least on paper) supposed to be fully compatible with Win 7 x64.


Does anyone have any ideas on what could be causing this issue and how I can fix it?


My System SpecsSystem Spec
.
27 Jan 2010   #2
brady

 

Server running DNS?
My System SpecsSystem Spec
27 Jan 2010   #3
Curve

Win 7 x64
 
 

Quote   Quote: Originally Posted by brady View Post
Server running DNS?
Yes.
My System SpecsSystem Spec
.

27 Jan 2010   #4
brady

 

2k3? server software firewall enabled? simple file sharing 'disabled' on the se7en machine?
My System SpecsSystem Spec
27 Jan 2010   #5
Curve

Win 7 x64
 
 

Quote   Quote: Originally Posted by brady View Post

2k3? server software firewall enabled? simple file sharing 'disabled' on the se7en machine?

Server 2008 R2 x64

There is a software firewall installed, but it's configured to allow full access within the internal LAN.

If I remember correctly, there is no simple file sharing in Windows 7 anymore, but the Sharing Wizard is disabled.


You have something in mind?
My System SpecsSystem Spec
27 Jan 2010   #6
Curve

Win 7 x64
 
 

I have additional info. I ran the following test: I mapped a drive to the remote workstation, using its IP address (i.e. \\192.168.1.1\c$) and left it running.

After a while, I couldn't access this either. Now, I *can* ping the remote machine by IP, but if I try to map another drive to it, I get the same error I'd normally get - "The specified network name is no longer available".
My System SpecsSystem Spec
27 Jan 2010   #7
brady

 

I would check the DNS tool in AD. Make sure the forward and reverse zones show the correct ip to name and vice versa. Also check your event logs to ensure no RPC errors and DNS errors.
My System SpecsSystem Spec
27 Jan 2010   #8
Curve

Win 7 x64
 
 

Quote   Quote: Originally Posted by brady View Post

I would check the DNS tool in AD. Make sure the forward and reverse zones show the correct ip to name and vice versa. Also check your event logs to ensure no RPC errors and DNS errors.

There are no errors that would appear to be connected to this issue.

Forward Zones are correct, and there are no Reverse Zones configured on this server. However, the server is unchanged from when this Win 7 workstation was running XP, and in XP this issue did not exist.
My System SpecsSystem Spec
08 Feb 2010   #9
CaptNibble

Windows 7, Windows XP
 
 
Loosing mapped drives Windows 7

I also have the same problem.
We have a windows 7 machine sharing the public folder.
2 computers running XP mounting that folder as a network drive on the local network.
4 other computers also running XP mounting that same folder via VPN (Hamachi) via the internet.
All work well.
But once in a while, we get the cannot access messages on all the remote and local network computers at the same time. I can still access all the computers from Windows 7 but they cannot access the Windows 7 machine.
I have tried numerous things such as renewing via IPConfig, modifying the autodisconnect mounted drives in the registry. Giving the network max memory access. The only solution is a reboot of the Windows 7 machine.
Sometime it will happen 3 times a day and sometime we go 3 days with no problems.
Because we can go 3 days with that much activity from the various computers tells me that it's configured correctly. There must be some kind of Bug in Windows 7 machine.
Previously we were using an XP machine to share the folder and it ran for years without any problems at all.
Any ideas?
My System SpecsSystem Spec
08 Feb 2010   #10
chev65

Windows 7 Ult, Windows 8.1 Pro,
 
 

The fix for this problem is below.

In responce to the issue listed in this thread.... Fix is in bold below.

http://social.technet.microsoft.com/...0-5a0f05b3c5c0

We have increased the memory allocation for the LAN driver in the Windows 7 registry and have been sending a couple of hundred GB of data to the drive array for the past hour and a half with no lockouts. I'm beginning to think this has solved the issue.

We've also realized that we are still using the Windows 7 LAN driver rather than the recommended chipset drivers. We're hoping that the memory fix does the trick, but it certainly doesn't hurt to get the right drivers too. I'll update if we have any further issues. Otherwise, assume this worked. I would recommend for other users to update your LAN drivers on all machines FIRST and then try the above fix if the LAN update doesn't work.

Update#4: After a week, we have had no more issues with the drives disconnecting. Increasing the memory allocation for the LAN driver per the social.technet.microsoft.com article seems to have fixed the problem. Hope this helps you guys.

How to perform the registry adjustment to allow for more LAN memory, second post down in this thread.
http://social.technet.microsoft.com/...1-87de9c2fa7c6
My System SpecsSystem Spec
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 Remote PCs inaccessible by name shortly after mapping




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