One PC loosing it's connection to Internet in a small network

Posted on 2007-10-16
Last Modified: 2008-01-09
Hey experts!

I  have a really weird situation right here, and would appreciate some help!

Ever since I reinstalled Windows XP Pro on my own PC two weeks ago, I frequently loose my connection to the Internet. What I don't understand is that I'm in a small network (4 home PCs in my house) and I'm the only one having this problem!

When I reinstalled Windows, I did all the updates and also reinstalled all my applications, including my spywares/antivirus (Spybot - AVG - Adaware - Hijackthis annd even the Windows Defender software!). First thing I did when I started loosing the connection was to run them al, thinking it might be a spyware, but everything came clean.

Then I thought it might be my oldschool Netgear RP114 router that was playing me. I checked the configuration, reseted it and the modem a couple hundred time, and finaly switched it to a new Linksys BEFSR41 router I had. The result was the same while all the other computers and the Xbox were still working perfectly.

What frustrates me is that I can't reproduce the problem, and doesn't have a clear idea as to why it is doing this. Most of the time it seems to happen when I downloading big files, but I also get disconnected while browing the Web. When I get disconnected, I can reboot my PC and everything works fine again for some time. Also, I noticed that when I loose the connection, I still have an IP address when I use IPCONFIG. It returns me the address of the modem, like I wasn't connected to the router anymore. The other thing I noticed is that the number of packet sent drops to 0 while the number of packets received is up in the thousands when I get disconnected.

Finally, I don't think my network Card, an Accton EN1207D-TX PCI would be the problem since I used it for a couple years now, and never had troubles with it. The day before I reformated it was working perfectly...

I hope you guys can help me out with this, I'm definately not a pro in networking and I ran out of ideas a long time ago! Let me know if you need more information.

Thanks a lot for your time,
Question by:The_Kingpin08
    LVL 2

    Expert Comment

    First things to check are:
    -Network cable: switch with another on the network, also switch ports on your switch/router
    -Check for DNS resolution issues: ipconfig /flushdns - see if you can ping, if after flushing cache and pinging google fails try accessing it via IP for example, if this works set your DNS manually in the TCP/IP properties for your NIC
    -Reset your TCP/IP stack: netsh i i r log.txt (under command prompt)
    -Are you able to access network shares when your internet goes down?
    -Disable any firewalls running
    -Check half open connections, if this is reached it will show in the event viewer under: Start > My Computer > Control Panel > Administrative Tools > Event Viewer > System
    LVL 5

    Expert Comment

    it's because of the tcp/ip stack i think try to reinstall it

    Author Comment

    how do I reinstall the "tcp/ip stack"?
    LVL 2

    Accepted Solution

    Resetting the TCP/IP stack as I said earlier is the same on XP+ as a reinstall.
    -Reset your TCP/IP stack: netsh i i r log.txt (under command prompt)

    Author Comment

    Hey guys,

    I tried reinstalling the TCP/IP stack anf everyting but the problem still remains.

    Here's a screenshot of Windows' event viewer, maybe it will you to find my problem. I can translate in english if you need.

    Thanks a lot for your help,

    Author Comment

    Anyone can help please? Let me know if you need more information.


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