Network restricted due to hardware device
1, check the network cable and Crystal head contact is bad
First of all, check your network cable is not plugged in, the crystal head at both ends of the cable pull back, or replace a new network cable.
2, check modem, switch, router and other internet equipment
Reboot the modem, switch, router, or restore to the factory state, and do not forget to open the DHCP option for the route, and check the router security policy settings, whether to bind the MAC address, or whether to enable restrictions such as IP address filtering.
3, check the network card equipment and drive is normal
Uninstall the network card, wireless network card driver, download and install the latest version of the network card, wireless network card driver, or replace the NIC test.
4, check the BIOS related settings and version compatibility
Try to restore the BIOS defaults and update the BIOS to the latest version.
Software system-related reasons cause network constraints
1, check the Network service status
Verify the status of network services such as DNS client, DHCP client, IP Helper, and Wirelesszero configuration (default is on), and then restart the computer.
2. Check IP address and DNS server address
Verify that the required IP address and DNS server address input are correct (automatically obtained by default). For a network that has a binding IP address and DNS server address, enter the specified IP address and DNS server address.
3, reset network connection, proxy, DNS cache
Run the command prompt as an administrator and enter the following command:
netsh WINHTTP RESET PROXY
Press ENTER after each line is completed and reboot the computer after execution.
The Winsock exception causes network connection hints to be restricted, and you can reset Winsock by using a command prompt (run as an administrator):
When the input is complete, press ENTER to confirm that the Winsock directory can be reset by restarting the computer.
5, check the system firewall settings and system security settings
First the firewall is turned off to confirm the normal, normal, and then modify the firewall corresponding entry and exit rules. Check that the local Security policy "---IP Security policy settings are normal.
6, check the wireless network is checked "to enable Federal information processing standards for this network"
The win8/8.1 system defaults to "Enable federated information Processing standards for this network", and some win8/8.1 connected WiFi Limited Users can resolve WiFi wireless restrictions by checking this setting.
7, check whether the system is poisoned, whether the system patch is snapped, Hosts file is abnormal modification
Under Windows XP, a patch is required to support WPA2-PSK encryption, and the hosts file is altered to prevent the site from being blocked. Therefore, if the above other operations are invalid, you can consider killing virus, upgrade system patches, repair hosts files.
