Network connection drops every 15 mins

Hi all,
i'm loosing network access on my iMac. This has started tonight, I had never had any problem before. My iMac is connected through Ethernet interface to a switch, then access to a router and finally to the modem cable. I have several other computers on this home network, all of them working properly and accessing to Internet without any problem.
Only the iMac is behaving strangely, and only since a few hours.
When the problem occurs, everything seems normal : LEDs are on on the switch, ifconfig -a gives a normal report (interface up, IP address ok within network range (no APIPA), netstat -rn OK), and i have no entry in system. log or whatsoever. But I can't nervertheless access to any Internet site, nor can I even ping my defaut router.
I began to "solve" the problem by rebooting the mac, then found that, when the problem occurs, I can solve it by going to Network preferences, advanced options, TCP/IP tab and press the "renew DHCP lease". Then everything works fine for 15 minutes, and I have to renew this operation.
The strange thing is that I used the iMac this morning and it was working fine. When I switched it on again tonight, the problem appeared .... Nothing changed, execpt one thing (but I can't find any connection) : the World of Warcraft laucher has been updated this morning ! But I can not imagine that this might generate trouble on the TCP/IP stack of Mac OS X !!!!
When the network connection is lost, all traffic is stopped, not only HTTP. If I'm for example playing WoW, I loose the connection to the game servers. Renewing the DHCP lease fixes the problem if done quickly enough.
I know I never had this problem before, as I'm connected to WoW almost every day and could so far play without any problem for (sometimes) hours.
I've seen some posts describing more or less the same behavior, but no answers so far. Surprisingly, many of them reports problems occuring every 15 mins.
Any idea ?
Thanks.
PhC.

Hello,
I've found a workaround : I've switched my TCP/IP config to static IP address and everything is working fine so far.
Hope this helps.
PhC.

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WAP551 and Apple Macbooks - connections drop every 10 minutes.

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>> associated to "YETU". Bailing on auto-join.
>> Thu Apr 10 13:34:44.536 <airportd[26500]> _doAutoJoin: Already
>> associated to "YETU". Bailing on auto-join.
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>> associated to "YETU". Bailing on auto-join.
>> Thu Apr 10 13:34:44.665 <airportd[26500]> _doAutoJoin: Already
>> associated to "YETU". Bailing on auto-join.
>> Thu Apr 10 14:20:54.383 <airportd[33885]> _doAutoJoin: Already
>> associated to "YETU". Bailing on auto-join.
>> Thu Apr 10 16:53:21.174 <airportd[53703]> _doAutoJoin: Already
>> associated to "YETU". Bailing on auto-join.
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>> associated to "YETU". Bailing on auto-join.
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>> associated to "YETU". Bailing on auto-join.
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>> associated to "YETU". Bailing on auto-join.
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Hey,
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>From what I understand the various devices (wireless card, network card, webcam, etc) inside the laptop are connected to some sort of usb hub. My guess is that is something wrong with this 'hub' since the webcam is also working faulty.
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Hi, I'm new to iTunes and apple, but this is happening to me too! I've got iTunes 8 and whenever I run it, my wireless connection drops (disables itself) and cannot be restarted without rebooting the machine. Did you manage to find an answer?

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Hi
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Bye

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Solved!
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You need to Update the Drivers for your Wireless Adapter...Download the Drivers from here
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Internet connection down every 20 mins

Hello, everyone
Today I asked my ISP to configure my modem/router as a bridge, and then connected a TL-WR541G (TP-LINK) router to manage ports and such.
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Hello, everyone
Today I asked my ISP to configure my modem/router as a bridge, and then connected a TL-WR541G (TP-LINK) router to manage ports and such.
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Hyper-V Host: Dell PowerEdge R620 Server with 8 NIC, 256GB RAM connected to iSCSI SAN running Windows 2008 R2 SP1
Guest Machine(s): Windows 2008R2 or 2012 servers (total of 8 servers)
Symptom: Windows 2008 R2 server drops the network connection. Cannot PING or access the server. Tried rebooting guest server, but still not able to connect. So changed the network connection via Hyper-V Management console to another
virtual adapter, and the system comes back online immediately.
Logical thinking: The NIC must be bad. But the problem continued at random times (like once or twice a week - especially in the morning with heavy network traffic load). So, I switched the network back to the original Virtual NIC, and the system
runs fine.
So it seems that the Hyper-V randomly "kills" the NIC when it is utilizing heavy I/O load. And only way to fix it at this time is to swap the virtual NIC (5 sec but need to do manually). Tried add another NIC to provide additional bandwidth,
but same problem exists.
Is there some sort of patch available to address this? Or maybe registry update to IGNORE the heavy I/O on a Guest OS?
I looked into http://support.microsoft.com/kb/2263829/en-us but this seems to be a different issue as the article states that the machines comes online when rebooted where as that is not the case on my part.

Hi,
The best place for this is in the Hyper-V forum, this forum if for Virtual Server 2005.
http://social.technet.microsoft.com/Forums/windowsserver/en-US/home?forum=winserverhyperv
You'll get a lot more Hyper-V eyes on it there.
Also, what type of NICs, updated drivers, teaming, etc?

Network connection drops on MacBook Pro

I have a MacBook Pro 15 “ Unibody OSX 10.5.8 (have not yet upgraded to Snow Leopard) 2.53 GHz Intel Core 2 Duo 4GB Ram purchased in December 2008. This was my first Mac purchase having used only Windows PCs prior to that. My daughter has a nearly identical Macbook Pro purchased for her in July of 2008 which is also running OSX 10.5.8. Everything on my Mac has worked perfectly---and beautifully-- until about one month ago when I started having problems connecting to our home network (Netgear Router, Commcast provided modem). It is important to know that my daughter’s MacBook Pro and my wife’s Dell laptop (Vista) do not and have never experienced the network connection problem I have been experiencing---only my Macbook Pro--- so I assume the fault lies somewhere other than with the router or modem. I lose the internet connection once or twice each day--sometimes when I am in the middle of something and sometimes when I turn my MacBook on from being shut down or from sleep--happens in all three states. After discussing this issue on the phone with several people at Apple tech support (all of whom were very pleasant and patient) it was determined that the internet connection issue could be solved temporarily by dragging the System Configuration Folder from the HD Preference Library to the desktop, then restarting, then clicking on our home network name. Whenever I follow this procedure I am able to connect to the Internet again and everything is fine until another 12 to 24 hours goes by and then I lose the connection again, repeat the fix and so on and so on. Since this problem does not occur more frequently than once or twice a day I have not bothered to take my MacBook to an Apple Store to see if the problem is caused by a hardware issue. I do not have a back up computer for my personal use at home and would rather not take my MacBook in unless until I have exhausted any other options that might exist. Does anyone out there have any suggestions? Any help would be greatly appreciated.

Welcome to the discussions forum Rpma1900.
I can't explain your problem, but since no one has posted any ideas might I suggest the following?
Try turning OFF IPv6 in Network Preferences. IPv6 is a great idea in theory but I've never encountered a network situation in which it's resulted in any performance improvement.
Try giving your MacBook Pro a fixed IP address. Make it numerically higher than any that might be provided by your Netgear router so it won't conflict with them.
Finally, I once experienced this identical problem using a Linksys router, but with a strange twist: my Vista computer would lose connection in much the same manner as your MacBook Pro, while all my Macs would remain happily connected. After exhausting every other imaginable solution, including the above suggestions, I finally removed the Linksys router and installed an AirPort Express. Problem solved.

Network connection drops every 15 mins

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