Reasons for network limitation: 1. Hardware reasons cause the computer network to be limited. You can check whether the network cable and crystal head are in poor contact; 2. Software system reasons cause the computer network to be limited. Check the network service status.
#The operating environment of this article: Windows 7 system, Dell G3 computer.
Reasons for restricted network:
1. Computer network is restricted due to hardware reasons
Method:
1. Check whether the network cable and crystal head are in poor contact
First, check whether the network cable is plugged in properly, pull out both ends of the network cable crystal head and re-insert it tightly, or replace it with a new network cable .
2. Check the MODEM, switch, router and other Internet equipment
Restart the MODEM, switch, router or restore the settings to the factory state. At the same time, don’t forget to turn on the DHCP option of the router and check the router security. Policy settings, whether to bind MAC address, whether to enable IP address filtering and other restriction functions.
3. Check whether the network card device and driver are normal
Uninstall the network card and wireless network card driver, download and install the latest version of the network card and wireless network card driver, or replace the network card and test.
4. Check BIOS related settings and version compatibility
Try to restore the BIOS default settings and update the BIOS to the latest version.
2. The computer network is restricted due to software system reasons
Method:
1. Check the network service status
Confirm DNS Client, DHCP Client, IP Helper and WirelessZero
Configuration and other network service status (the default is on), and then restart the computer.
2. Check the IP address and DNS server address
Confirm whether the required IP address and DNS server address are entered correctly (the default is to obtain them automatically). For a network bound to an IP address and DNS server address, enter the specified IP address and DNS server address.
3. Reset the network connection, proxy, and DNS cache
Run the command prompt as an administrator and enter the following command:
• NETSH INT IP RESET
• NETSH WINHTTP RESET PROXY
• IPCONFIG /FLUSHDNS
After completing each line of input, press the Enter key to confirm, and restart the computer after completion.
4. Reset Winsock
Winsock exception causes the network connection prompt to be restricted. You can use the command prompt (run as administrator) to reset Winsock:
• NETSH WINSOCK RESET
After completing the input, press the Enter key to confirm. Restart the computer to reset the Winsock directory.
5. Check the system firewall settings and system security settings
First turn off the firewall to confirm whether it is normal. After it is normal, modify the corresponding inbound and outbound rules of the firewall. Check whether the "Local Security Policy"---"IP Security Policy" settings are normal.
6. Check whether the wireless network has checked "Enable Federal Information Processing Standards for this network"
Win8/8.1 The system does not check "Enable Federal Information Processing Standards for this network" by default. Some Win8/8.1 users with restricted Wi-Fi connections can solve the problem of Wi-Fi restrictions by checking this setting.
7. Check whether the system is poisoned, whether the system patches are installed, and whether the hosts file has been abnormally modified
Under Windows
XP, you need to install a patch to support WPA2-PSK encryption method, HOSTS The file was abnormally modified, causing the website to be blocked. Therefore, if the other operations above are ineffective, you can consider virus scanning, system patch upgrade, and repair of the HOSTS file.
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