Limited or No connectivity:
One of the reasons for that to happen is:
You get this message after you have installed Windows Xp service pack 2, this will not let you access the internet or some network resources.
There are many solutions for the same, and most of them just bullshit you and ask you to turn off this notification. But its only good if if its a false message, but if the system has really lost LAN connectivity or if it is unstable then you are in trouble.
Also does not help you to go and ask your ISP for the same, believe i have worked for them and they will give you all the crap in the world. So this would help them as well.
It is due to a bug in the Service pack 2 of windows xp
One solution is patching for this bug,or you may have to reinstall your firewall,rebuild the configuration of your router,drop the connection speed of you connection from 100 Mbps to 10 Mbps,or in case of a network assign a dedicated IP to your computer in the network.
Symptoms that your system is affected by this bug:
1) After installing Windows service pack 2 your network starts reporting "Limited or No Connectivity".
2) You are not able to connect to the internet or your LAN after installing Windows service pack 2.
3) Your network gets stuck while "Acquiring IP Address"
Solution:
Download the patch you can download a zip file with the patch, registry file, and instructions by
clicking here.
Run the patch and install it.
Run this short Registry fix to complete the update. Type the following lines in Notepad and save the file as FixReg.reg on your desktop, then double click on it to install into your registry.
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic es\IPSec]
"AssumeUDPEncapsulationContextOnSendRule"=dword:00 000002
Reboot the PC
If the error message pops up again, reboot you PC first.
If you want to disable the message after the problem is fixed:
Open Control panel >>> Open Network Connections and Right Click on the Local Area Connection and click on Properties >>> Uncheck the following option on the General Tab >>> "Notify me when this connection has limited or no connectivity"
Again if running the patch does not resolve the issue:
1) Your network or your Router may have some error on it. Power recycle the router or reconfigure your router.
2) Check the cabling for your router, straight-through CAT 5 or possibly a crossover cable and try another cable.
3) check your Network card and make sure its configured properly. Try and change the settings for the network card to 10Mbps/full Duplex to solve the issue. To do this open Control panel >>> Device Manager >>> properties of the Network card >>> click on the Advanced tab >>> find the Link Speed and Duplex section >>> Change from Auto Detect to 10Mbps/Full Duplex.
4) Check your firewall, especially if its Zone alarm, Black Ice, Nortan Firewall. Disable your firewall and test your connection. You may also have to uninstall and reinstall your firewall.
5) Reset your TCP/IP stack by downloading and running
WinsockXPFix.exe a Visual Basic program designed to fix corrupted TCP/IP issues, host file problems and a variety of other connectivity issues.
What will the Winsocfix Utility Do for your PC:
· Detect your current Operating System
· Release the IP address, taking you "Offline"
· Reset the TCP stack using Netsh.exe (Windows XP only)
· Delete the current Registry TCP and Winsock Values
· Import new "Working" Registry Values
· Backup any Current "Hosts" file
· Replace the "Hosts" file with a default one
· Reboot the Computer
6) If connecting to your network using Wi-Fi and using wireless security, your WEP or other security key may not be set properly. Check the wireless security configuration on your computer's network adapter and update if it necessary.
7) If using a broadband router and DHCP on your network, check your computer's IP address to verify it is valid and not a private address that starts with 169.254. An invalid address of the form 169.254.x.x signifies your computer's inability to obtain a usable IP address from your router.
Hope this helps, and if you need any further help just update the post for me