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network problem

my network connection is normal, i can browse the internet, log in to sametime, acccess network resources from another network, ping hostnames and ip addresses and others. after some time, i can't seem to access network resource, and all the stuff previously mentioned.

what i do is i refresh my network connection. i click on the network adapter icon then hit repair, it will refresh and everything will go back to normal.

can someone help me out figure what the problem is? thanks.
6 Solutions
What OS is being used?

Type or brand of AV?
Firewall OS or 3rd party being used?

If window could go to cmd prompt and try the following
ipconfig /all
    Is ipaddress DHCP, Gateway listed?

ping ipaddress
ping GW
Reinstall NIC driver will correct this issue. Get in Device Manager in Computer Management. On the right panel, right click on the network card and uninstall. Right click on your computer icon in device manager and Scan for HW change. Follow the wizard to reinstall the NIC driver. Reboot your PC.
After reinstall NIC driver, you go to the NIC's properties and then power management. Make sure both check boxes are unchecked so the NIC will stay on all the time.

nagodillaAuthor Commented:
thanks for helping out people. here are a few more details. this happened to the whole network. not just one computer. but to everybody else. OS on all workstations is XP SP2, on Symantec. Server is Win 2K3. got dns dhcp and ad running.
NFR key for Veeam Agent for Linux

Veeam is happy to provide a free NFR license for one year.  It allows for the non‑production use and valid for five workstations and two servers. Veeam Agent for Linux is a simple backup tool for your Linux installations, both on‑premises and in the public cloud.

If it is the case, reinstall NIC driver on your server instead of clients. This intermittent issue is mostly caused by NIC drivers. Make sure all drivers firmware are updated, but at first do the same above steps on your server to see if it corrects your problem. If your server is running team NIC, unteam and reinstall drivers then reteam your NIC.

Also, make sure your link speed duplex is matched with the switch. If the switch supports up to 100Mbps, set your NIC duplex to 100mps and auto instead of 1Gbps.

I agree it could be an issue with the NICs but if the server were to go down access to other PCs and/or devices would still be allowed. The only thing that would be affected (usually) from a downed server NIC would be possibly DNS and server access to shared drives etc.

If it happens again try to ping your default gateway address which can be obtained from using the command "IPCONFIG /all". If you cannot ping the gateway I would have to assume it is an issue with the switch... or one of the switches depending on the size and layout of your network. Try rebooting the switch (if it will not interfere with current production) without messing with the client configurations. As Inkevin mentioned, the speed duplex should match both from switch to server NIC as well as switch to router/firewall. Having it set to auto is not the correct set up in most cases.

If it is determined that it is indeed the switch then you might try updating the firmware to resolve the issue.

As stated before, the nic is the first place to look.  If this is a Broadcom 57xx nic, I have seen this behavior with them.  The driver includes a base driver and a RIS driver.  The RIS driver may have loaded and causes this kind of behavior.  

Also, you may check your DNS scavenging settings.  If these are too aggressive, they may be removing DNS entries that should still be active.
nagodillaAuthor Commented:
Hi People;

I apologize I was not able to update and answer back to this question of mine. After some time, we were able to figure out that the router was on DHCP, so it was throwing IPs along the way, making the gateway for some machines different. As soon as it was resolved, the network went back to normal.

Thanks to all who supported.


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