Quite Trite Ted wrote: Hardware: Gateway model DX4831, natively mirrored boot drive 8GB RAM Highpoint RocketRAID 622 connected to eSATA box for RAID storage, currently configured at 10TB Windows 7 Professional SP1 64bit, added Hauppauge PCIe TV capture cards and SnapStream BeyondTV server Machine is a member of a win2k3 hosted domain, DHCP and DNS are provided by win2k3 server.  The purpose of the machine is HTPC and File Server for my home network.  The machine is connected to an 8 port gigabit switch which is daisy-chained to a 16 port smart switch in another room.  Default gateway is a linksys/cisco E3000, connected to the smart switch. This machine is connected to an 8 port gigabit switch which is daisy chained to a 16 port gigabit switch.  Every so often, even with only moderate (less than 1GB data) amounts of throughput on the LAN the network connection on this machine will disconnect.  The symptom quoted by the connection's systray icon is usually 'default gateway unavailable'.  Of course, performing large (2+ GB) transfers (either incoming or outgoing) on the network accelerates the appearance of the symptom.  Right clicking on the network icon and selecting 'troubleshoot problems' will usually fix the connection, but sometimes requires a complete reboot to fix it.  Other devices connected to the 8 port switch do not exhibit any connectivity problems.  IPv6 is disabled throughout the network, as was suggested by several searches of the internet for similar problems and solutions. Windows event log has nothing before the associated dns lookup failures to be expected when experiencing lost network connectivity.  Copying files between RAID and USB or internal SATA storage has no effect on the network connection. I've tried replacing the network interface (disabled the on-board NIC in bios and put in a new PCIe network card), yet the problem persists.  Even with both of the network cards active and using a bridged connection, the problem persists. I'm really hoping that I can get this fixed.  Any suggestions? Have you checked the cables between PC and switch? Do you have any QoS settings in effect? That can be anything but is probably an electrical signal problem, caused by something. Wolfgang

Quite Trite Ted wrote: Replaced cables between PC and (8 port) switch a couple of times.  Still saw the same issues.  QoS is not in effect, as I'm trying everything I can to troubleshoot this problem.  AND it would be doubtful that both cables for the bridged connection is electrical signal (both cables having a problem).  Doubtful that it's the 8 port switch either, since other devices connected to that switch do not exhibit any problems. For a little background, I've been a systems engineer/analyst/technician for the last 25 years or so.  I've tested this to kingdom come trying to alleviate the problem.  Initially I suspected the physical network infrastructure, but I have since determined that there are no faults in the hardware.  I have seen a large number of posts similar to my own, none of which have a solution which works here. I'm trying desperately NOT to have to re-install the operating system on this box to fix the problem, but I'm beginning to suspect that's going to be the only answer that works. Have you tried to disable TCP Windows Scaling? Some routers / switches and other network hardware do not work well with the default TCP Windows Scaling methods applied by Win7 in the default configuration. Wolfgang

Hardware: Gateway model DX4831, natively mirrored boot drive 8GB RAM Highpoint RocketRAID 622 connected to eSATA box for RAID storage, currently configured at 10TB Windows 7 Professional SP1 64bit, added Hauppauge PCIe TV capture cards and SnapStream BeyondTV server Machine is a member of a win2k3 hosted domain, DHCP and DNS are provided by win2k3 server. The purpose of the machine is HTPC and File Server for my home network. The machine is connected to an 8 port gigabit switch which is daisy-chained to a 16 port smart switch in another room. Default gateway is a linksys/cisco E3000, connected to the smart switch. This machine is connected to an 8 port gigabit switch which is daisy chained to a 16 port gigabit switch. Every so often, even with only moderate (less than 1GB data) amounts of throughput on the LAN the network connection on this machine will disconnect. The symptom quoted by the connection's systray icon is usually 'default gateway unavailable'. Of course, performing large (2+ GB) transfers (either incoming or outgoing) on the network accelerates the appearance of the symptom. Right clicking on the network icon and selecting 'troubleshoot problems' will usually fix the connection, but sometimes requires a complete reboot to fix it. Other devices connected to the 8 port switch do not exhibit any connectivity problems. IPv6 is disabled throughout the network, as was suggested by several searches of the internet for similar problems and solutions. Windows event log has nothing before the associated dns lookup failures to be expected when experiencing lost network connectivity. Copying files between RAID and USB or internal SATA storage has no effect on the network connection. I've tried replacing the network interface (disabled the on-board NIC in bios and put in a new PCIe network card), yet the problem persists. Even with both of the network cards active and using a bridged connection, the problem persists. I'm really hoping that I can get this fixed. Any suggestions?

Quite Trite Ted wrote: Replaced cables between PC and (8 port) switch a couple of times. Still saw the same issues. QoS is not in effect, as I'm trying everything I can to troubleshoot this problem. AND it would be doubtful that both cables for the bridged connection is electrical signal (both cables having a problem). Doubtful that it's the 8 port switch either, since other devices connected to that switch do not exhibit any problems. For a little background, I've been a systems engineer/analyst/technician for the last 25 years or so. I've tested this to kingdom come trying to alleviate the problem. Initially I suspected the physical network infrastructure, but I have since determined that there are no faults in the hardware. I have seen a large number of posts similar to my own, none of which have a solution which works here. I'm trying desperately NOT to have to re-install the operating system on this box to fix the problem, but I'm beginning to suspect that's going to be the only answer that works. Have you tried to disable TCP Windows Scaling? Some routers / switches and other network hardware do not work well with the default TCP Windows Scaling methods applied by Win7 in the default configuration. Wolfgang Thanks for this suggestion! I used regedit to change HKLM/CurrentControlSet/services/Tcpip/Parameters/EnableWsd from 1 to 0 and rebooted. The system now maintains connection for more extended periods, but the speed of transfers degrades over time until less than one percent of the available bandwidth is being used, and doesn't come back up to full bandwidth without re-initializing the adapter.

Quite Trite Ted wrote: Hardware: Gateway model DX4831, natively mirrored boot drive 8GB RAM Highpoint RocketRAID 622 connected to eSATA box for RAID storage, currently configured at 10TB Windows 7 Professional SP1 64bit, added Hauppauge PCIe TV capture cards and SnapStream BeyondTV server Machine is a member of a win2k3 hosted domain, DHCP and DNS are provided by win2k3 server.  The purpose of the machine is HTPC and File Server for my home network.  The machine is connected to an 8 port gigabit switch which is daisy-chained to a 16 port smart switch in another room.  Default gateway is a linksys/cisco E3000, connected to the smart switch. This machine is connected to an 8 port gigabit switch which is daisy chained to a 16 port gigabit switch.  Every so often, even with only moderate (less than 1GB data) amounts of throughput on the LAN the network connection on this machine will disconnect.  The symptom quoted by the connection's systray icon is usually 'default gateway unavailable'.  Of course, performing large (2+ GB) transfers (either incoming or outgoing) on the network accelerates the appearance of the symptom.  Right clicking on the network icon and selecting 'troubleshoot problems' will usually fix the connection, but sometimes requires a complete reboot to fix it.  Other devices connected to the 8 port switch do not exhibit any connectivity problems.  IPv6 is disabled throughout the network, as was suggested by several searches of the internet for similar problems and solutions. Windows event log has nothing before the associated dns lookup failures to be expected when experiencing lost network connectivity.  Copying files between RAID and USB or internal SATA storage has no effect on the network connection. I've tried replacing the network interface (disabled the on-board NIC in bios and put in a new PCIe network card), yet the problem persists.  Even with both of the network cards active and using a bridged connection, the problem persists. I'm really hoping that I can get this fixed.  Any suggestions? Have you checked the cables between PC and switch? Do you have any QoS settings in effect? That can be anything but is probably an electrical signal problem, caused by something. Wolfgang

Replaced cables between PC and (8 port) switch a couple of times. Still saw the same issues. QoS is not in effect, as I'm trying everything I can to troubleshoot this problem. AND it would be doubtful that both cables for the bridged connection is electrical signal (both cables having a problem). Doubtful that it's the 8 port switch either, since other devices connected to that switch do not exhibit any problems. For a little background, I've been a systems engineer/analyst/technician for the last 25 years or so. I've tested this to kingdom come trying to alleviate the problem. Initially I suspected the physical network infrastructure, but I have since determined that there are no faults in the hardware. I have seen a large number of posts similar to my own, none of which have a solution which works here. I'm trying desperately NOT to have to re-install the operating system on this box to fix the problem, but I'm beginning to suspect that's going to be the only answer that works.

This issue should not be related to Windows 7. I suspect that it is caused by your router. Some times if the router works in a high temparature for a long time there will be several kind of issues. One of the issues is network disconnected.Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Quite Trite Ted wrote: Quite Trite Ted wrote: Replaced cables between PC and (8 port) switch a couple of times.  Still saw the same issues.  QoS is not in effect, as I'm trying everything I can to troubleshoot this problem.  AND it would be doubtful that both cables for the bridged connection is electrical signal (both cables having a problem).  Doubtful that it's the 8 port switch either, since other devices connected to that switch do not exhibit any problems. For a little background, I've been a systems engineer/analyst/technician for the last 25 years or so.  I've tested this to kingdom come trying to alleviate the problem.  Initially I suspected the physical network infrastructure, but I have since determined that there are no faults in the hardware.  I have seen a large number of posts similar to my own, none of which have a solution which works here. I'm trying desperately NOT to have to re-install the operating system on this box to fix the problem, but I'm beginning to suspect that's going to be the only answer that works. Have you tried to disable TCP Windows Scaling? Some routers / switches and other network hardware do not work well with the default TCP Windows Scaling methods applied by Win7 in the default configuration. -- Wolfgang Thanks for this suggestion! I used regedit to change HKLM/CurrentControlSet/services/Tcpip/Parameters/EnableWsd from 1 to 0 and rebooted. The system now maintains connection for more extended periods, but the speed of transfers degrades over time until less than one percent of the available bandwidth is being used, and doesn't come back up to full bandwidth without re-initializing the adapter.   This issue is most probably a sign that your router / switch is not capable or configured correctly to maintain the connection at full speed or a hardware problem. There are often hidden advanced settings, which have to be set, to get things running smoothly - I can only advise you to contact the support of this equipment. Wolfgang

This issue should not be related to Windows 7. I suspect that it is caused by your router. Some times if the router works in a high temparature for a long time there will be several kind of issues. One of the issues is network disconnected.Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Quite Trite Ted wrote: Quite Trite Ted wrote: Replaced cables between PC and (8 port) switch a couple of times.  Still saw the same issues.  QoS is not in effect, as I'm trying everything I can to troubleshoot this problem.  AND it would be doubtful that both cables for the bridged connection is electrical signal (both cables having a problem).  Doubtful that it's the 8 port switch either, since other devices connected to that switch do not exhibit any problems. For a little background, I've been a systems engineer/analyst/technician for the last 25 years or so.  I've tested this to kingdom come trying to alleviate the problem.  Initially I suspected the physical network infrastructure, but I have since determined that there are no faults in the hardware.  I have seen a large number of posts similar to my own, none of which have a solution which works here. I'm trying desperately NOT to have to re-install the operating system on this box to fix the problem, but I'm beginning to suspect that's going to be the only answer that works. Have you tried to disable TCP Windows Scaling? Some routers / switches and other network hardware do not work well with the default TCP Windows Scaling methods applied by Win7 in the default configuration. -- Wolfgang Thanks for this suggestion! I used regedit to change HKLM/CurrentControlSet/services/Tcpip/Parameters/EnableWsd from 1 to 0 and rebooted. The system now maintains connection for more extended periods, but the speed of transfers degrades over time until less than one percent of the available bandwidth is being used, and doesn't come back up to full bandwidth without re-initializing the adapter.   This issue is most probably a sign that your router / switch is not capable or configured correctly to maintain the connection at full speed or a hardware problem. There are often hidden advanced settings, which have to be set, to get things running smoothly - I can only advise you to contact the support of this equipment. Wolfgang

Quite Trite Ted wrote: Hardware: Gateway model DX4831, natively mirrored boot drive 8GB RAM Highpoint RocketRAID 622 connected to eSATA box for RAID storage, currently configured at 10TB Windows 7 Professional SP1 64bit, added Hauppauge PCIe TV capture cards and SnapStream BeyondTV server Machine is a member of a win2k3 hosted domain, DHCP and DNS are provided by win2k3 server. The purpose of the machine is HTPC and File Server for my home network. The machine is connected to an 8 port gigabit switch which is daisy-chained to a 16 port smart switch in another room. Default gateway is a linksys/cisco E3000, connected to the smart switch. This machine is connected to an 8 port gigabit switch which is daisy chained to a 16 port gigabit switch. Every so often, even with only moderate (less than 1GB data) amounts of throughput on the LAN the network connection on this machine will disconnect. The symptom quoted by the connection's systray icon is usually 'default gateway unavailable'. Of course, performing large (2+ GB) transfers (either incoming or outgoing) on the network accelerates the appearance of the symptom. Right clicking on the network icon and selecting 'troubleshoot problems' will usually fix the connection, but sometimes requires a complete reboot to fix it. Other devices connected to the 8 port switch do not exhibit any connectivity problems. IPv6 is disabled throughout the network, as was suggested by several searches of the internet for similar problems and solutions. Windows event log has nothing before the associated dns lookup failures to be expected when experiencing lost network connectivity. Copying files between RAID and USB or internal SATA storage has no effect on the network connection. I've tried replacing the network interface (disabled the on-board NIC in bios and put in a new PCIe network card), yet the problem persists. Even with both of the network cards active and using a bridged connection, the problem persists. I'm really hoping that I can get this fixed. Any suggestions? Have you checked the cables between PC and switch? Do you have any QoS settings in effect? That can be anything but is probably an electrical signal problem, caused by something. Wolfgang Although I was skeptical as to there being an actual hardware problem, I finally got around to replacing the switch that this machine is connected through. The problem has completely disappeared now. Thanks for your assistance.

Quite Trite Ted wrote: Hardware: Gateway model DX4831, natively mirrored boot drive 8GB RAM Highpoint RocketRAID 622 connected to eSATA box for RAID storage, currently configured at 10TB Windows 7 Professional SP1 64bit, added Hauppauge PCIe TV capture cards and SnapStream BeyondTV server Machine is a member of a win2k3 hosted domain, DHCP and DNS are provided by win2k3 server. The purpose of the machine is HTPC and File Server for my home network. The machine is connected to an 8 port gigabit switch which is daisy-chained to a 16 port smart switch in another room. Default gateway is a linksys/cisco E3000, connected to the smart switch. This machine is connected to an 8 port gigabit switch which is daisy chained to a 16 port gigabit switch. Every so often, even with only moderate (less than 1GB data) amounts of throughput on the LAN the network connection on this machine will disconnect. The symptom quoted by the connection's systray icon is usually 'default gateway unavailable'. Of course, performing large (2+ GB) transfers (either incoming or outgoing) on the network accelerates the appearance of the symptom. Right clicking on the network icon and selecting 'troubleshoot problems' will usually fix the connection, but sometimes requires a complete reboot to fix it. Other devices connected to the 8 port switch do not exhibit any connectivity problems. IPv6 is disabled throughout the network, as was suggested by several searches of the internet for similar problems and solutions. Windows event log has nothing before the associated dns lookup failures to be expected when experiencing lost network connectivity. Copying files between RAID and USB or internal SATA storage has no effect on the network connection. I've tried replacing the network interface (disabled the on-board NIC in bios and put in a new PCIe network card), yet the problem persists. Even with both of the network cards active and using a bridged connection, the problem persists. I'm really hoping that I can get this fixed. Any suggestions? Have you checked the cables between PC and switch? Do you have any QoS settings in effect? That can be anything but is probably an electrical signal problem, caused by something. Wolfgang Although I was skeptical as to there being an actual hardware problem, I finally got around to replacing the switch that this machine is connected through. The problem has completely disappeared now. Thanks for your assistance. This might be the problem with the drivers for the network adapter on the computer; Click Start>> type in Device Manager in the Start Search >> expand the Network Adapters in the Device Manager >> right click the Network Adapter >> click on Properties>> click on driver tab >> click on Update Drivers>> click OK. If the issue still persists, I suggest that you install the latest drivers for the manufacturer’s website and check. Let me know if this worked. http://www.techyv.com/questions/problems-connectivity-network-windows-7