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SOLVED: Windows 7 Professional loses network connectivity after a restart

p_s_92 576 52 February 27, 2011 at 07:23 PM
The machine with the Windows 7 Professional(64 bit) OS is Dell Optiplex 980 mini tower. We get network connection using multimode ST fiber cables for all machines in our area. We are on a 100MB network and have static IP for all devices on our network and manual entries for DNS servers. Also, the duplex setting is set as 100MB/Half Duplex for all devices on the network.

Since the Dell Optiplex 980 mini tower did not have an internal fiber adapter, I used a Allied Telesis AT-MC101XL external transceiver(http://www.alliedtelesis.com/p-2217.html), but when Windows 7 Professional(64 bit) starts up, I notice a yellow flag on the network icon(located on the right-bottom corner) which states "Limited or no network connectivity" I do a manual power reset by unplugging the power cable to the AT-MC101XL external transceiver, waiting for 2 mins and then plugging it back into the power source after which the Dell machine is able to access the network. But, network connectivity is intermittent as the user's email account in Outlook 2007 is configured as an Exchange account(rather than POP) so Outlook 2007 freezes with the message that Outlook is trying to connect to the Exchange server. I have to terminate Outlook 2007, restart it. When the user is typing something in the Outlook calender this occurs forcing her to quit and lose whatever was typed.

I spoke to Allied Telesis tech support who tested a AT-MC101XL with Windows 7 and when Windows 7 Professional (64 bit) booted they too lost connectivity. However, the next day when I called, they told me they did not lose any connectivity and they were puzzled why they lost connectivity the first day. The same transceiver works fine with a Windows Vista/XP(both 32bit) machines in our office.

I took out a working internal Allied Telesyn AT-2701FX PCI 100Mb Fiber Adapter) card whose manual is at http://www.alliedtelesis.com/medi...1fx_ds.pdf which was in a machine running Win XP 32bit and was running fine without any network issues and inserted it in the Dell optiplex. Loaded the driver http://www.alliedtelesis.com/user...in7X64.zip from the page http://www.alliedtelesis.com/supp..._1829.aspx

The driver installed fine and I could access the network. But, when I rebooted, I noticed a yellow flag on the network icon(located on the right-bottom corner) which states "Limited or no network connectivity". I went to the Device Manager, disabled the network card, waited for a minute, re-enabled it and then I was able to access the network.

The Dell machine(running Windows 7) has McAfee antivirus, all Windows patches, the firewall is turned on, no suspicious programs are starting up which could cause the network connectivity issue.

Allied Telesis claims their cards are compatible with Windows 7 professional 64 bit and their other customers don't have issues after reboot. But, I don't know if their other customers have static IPs for their devices and manual entries for DNS servers like we do.

1. What could be the reason that after booting up, there is no connectivity when using a Allied Telesis external transceiver or internal fiber card, but after a power reset is done for external transceiver or disable/enable in device manager for internal card I can access the network?

2. Is Windows 7 Professional 64 bit somehow configured to need a dynamic IP? After reboot, the static IP I assigned persists so it is not that the static IP address is wiped out which causes the network issue.

3. How can I fix it other than downgrading the user from Windows 7 64 bit to Windows XP 64 bit?

Any suggestions would be appreciated.

57 Comments

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#2
Bonjour can be a headache sometimes. Stop it and set it to Disabled via Start > Services
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#3
You might try uninstalling the AV for a day and see what happens. I have seen more weird networking issues fixed when AV's were uninstalled. What are the UAC settings on the PC?

You should be able to set a static IP for the machine with no problems. How are you doing it now?
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#4
If the above doesn't help, try resetting your networking stack. From an administrator command prompt issue:

netsh int ip reset C:\netsh.log.txt
netsh winsock reset
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#5
Quote from G37 View Post :
Bonjour can be a headache sometimes. Stop it and set it to Disabled via Start > Services
Thanks, did that but the issue still persists.

Strange part is I have static IP and according to http://social.technet.microsoft.c...775170b880

if you have static IP you should not face this issue.
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#6
Quote from LiquidRetro View Post :
You might try uninstalling the AV for a day and see what happens. I have seen more weird networking issues fixed when AV's were uninstalled. What are the UAC settings on the PC?
I will try that, but doubt if the AV could the reason since that is on our XP, Vista machines and they are fine. The UAC(User Account Control) settings are on, but even when I log in as Admin I cannot access the network after a reboot so don't think some UAC setting is preventing the user from accessing the network.
Quote from LiquidRetro View Post :
You should be able to set a static IP for the machine with no problems. How are you doing it now?
We have static IPs for all devices on our network.

And, still having that issue though as per http://social.technet.microsoft.c...775170b880 we should not.

Thanks for your suggestions.

Quote from redmaxx View Post :
If the above doesn't help, try resetting your networking stack. From an administrator command prompt issue:

netsh int ip reset C:\netsh.log.txt

netsh winsock reset
Thanks, tried that, but still the issue persists.
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Last edited by p_s_92 February 28, 2011 at 11:01 AM. Reason: Automerged Doublepost
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#7
Does this issue occur with a regular Ethernet card?
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#8
isn't there anything in a log to say the NIC failed to initialize or something on bootup? Can you adjust the bootup order so it's the last thing to get done (does Windows support that?)
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#9
Quote from vivahate View Post :
isn't there anything in a log to say the NIC failed to initialize or something on bootup? Can you adjust the bootup order so it's the last thing to get done (does Windows support that?)
Roll There's no adjusting the boot order on Windows. But that wouldn't make a bit of difference anyway.
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#10
things to check if you havent done so:
1. Auto/half/Duplex settings - speed mismatch might be occurring that's dropping frames.
2. Do you have the 10/100/1000 ethernet card? GB card perhaps?
3. Check media converter for fiber.
4. If you have static - set Win 7 to that static IP.
that's all I can think off right now. Smilie hopes that helps.
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#11
Is this a FACTORY install of Windows on the Optiplex 980?

I had some weird issues on the 960's (we don't have any 980's yet) that I can't remote access them with a stock Dell install of windows (xp pro in my case), yet if I install windows from "scratch" I can remote into the same box all day long. I've got 5 of these boxes (1 in each field office) so 4 of them, it's not an issue, but the one that is next door @ our sister company, and on the same physical LAN, it's the only box I can't remote into. I can get to all other boxes...and when on the 960, It can get to any box on the LAN...So I just VNC into instead.
/sightly off tangent, but possibly relevant to your problem.
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#12
Quote from .DC. View Post :
Is this a FACTORY install of Windows on the Optiplex 980?

I had some weird issues on the 960's (we don't have any 980's yet) that I can't remote access them with a stock Dell install of windows (xp pro in my case), yet if I install windows from "scratch" I can remote into the same box all day long. I've got 5 of these boxes (1 in each field office) so 4 of them, it's not an issue, but the one that is next door @ our sister company, and on the same physical LAN, it's the only box I can't remote into. I can get to all other boxes...and when on the 960, It can get to any box on the LAN...So I just VNC into instead.
/sightly off tangent, but possibly relevant to your problem.
You might want to check the firewall and logs for this machine. WIndows Fw, AV firewall - other network security programs that might be preventing you from login into the box. Maybe add RDP to the list of exclusions to your FW program. Smilie
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#13
so you have:
1. tested the fiber receiver in the problem computer in another computer not running win 7 and it worked fine.
2. tested a working receiver from another computer not running win 7 in the problem computer and it didnt work.

seems to me the obvious problem is the drivers for Win7 from your card maker.

try a card from a different manufacturer and if that works, problem confirmed and corrected.
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Quote from R1Budha View Post :
so you have:
1. tested the fiber receiver in the problem computer in another computer not running win 7 and it worked fine.
2. tested a working receiver from another computer not running win 7 in the problem computer and it didnt work.
Confused The OP says that the card came from a working system. You'll also notice that an external transceiver that connects via Ethernet had the same problem. How is this obviously a driver problem?
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#15
Quote from SolidXnake View Post :
things to check if you havent done so:
1. Auto/half/Duplex settings - speed mismatch might be occurring that's dropping frames.
We are on 100MB half duplex and I have set the internal fiber adapter card for that. Yes, speed mismatch can drop frames, but there is no connectivity at all.

Quote from SolidXnake View Post :
2. Do you have the 10/100/1000 ethernet card? GB card perhaps?
The machine has a 1GB ethernet card, but it is connecting now using the AT-2701 internal fiber adapter card so the ethernet card should not matter now. Earlier when I was using a external transceiver with it, it might have but a 1GB ethernet card can work on a 100MB network.

Quote from SolidXnake View Post :
3. Check media converter for fiber.
If by media converter you mean the external transceiver, it is OK and works fine on a XP/Vista 32 bit machine. And, the network port, ST fiber cable are also fine.

Quote from SolidXnake View Post :
4. If you have static - set Win 7 to that static IP.
Did that, without it we cannot connect at all.
Quote from SolidXnake View Post :
that's all I can think off right now. Smilie hopes that helps.
Thanks for your suggestions.
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Last edited by p_s_92 February 28, 2011 at 03:32 PM.
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