The reasons are as follows:
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1. The password is incorrect.
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2. The wireless router is not bound to the MAC address.
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3. The service Settings are not completely correct.
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4. The assigned IP address is incorrectly set.
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5, the required patch is not installed.
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6. The router is damaged.
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1. Check whether the password is incorrect
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When entering the wireless connection password, if the password is relatively long, it is possible to enter the wrong password, so it is recommended that you enter the password again. If possible, use copy and paste directly to enter the password. When copying and pasting, be careful not to select irrelevant characters yo, adding a space or two is the most common mistake.
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2. Check whether the wireless router is bound to a MAC address
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In order to prevent others from rubbing off on the network, many home users have set up wireless Mac address filtering, but when the computer or wireless card is replaced, it can not get on the network, so you need to add a new MAC address in the router Settings.
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3. Check whether the service Settings are correct
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Check the service Settings on the PC. For example, if the DHCP Client and WirelessZero Configuration services are not enabled, the wireless network cannot be used properly. If DHCP is disabled, the computer that uses the automatic IP address assignment cannot automatically configure an IP address.
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4. Check whether the assigned IP address is correct
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Wireless networks use manually assigned IP addresses and DNS addresses, which need to be set in the wireless connection properties under Windows. Unlike Linux, Windows cannot set different IP addresses for different wireless networks, so when switching between multiple wireless networks, it is easy to get on the network if you use manually assigned IP.
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5. Check whether the driver is suitable for the current network adapter
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Most of this happens when you use a wireless card for the first time, if you use Windows 7, you will automatically download and install the correct network card driver under normal circumstances. However, in extreme cases, the downloaded driver is not necessarily suitable for network card use, so you may need to download the driver from the manufacturer's home page.
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6. Check whether the required patches are installed
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Under Windows XP, a patch is required to support WPA2-PSK encryption, so if your router uses this encryption and you haven't upgraded to XP SP3, install patch KB893357.
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It is best if the fault can be detected and fixed here, but if after fixing the system, the Internet is still not available, then we go back to the Network and Sharing Center, find the change wireless card properties, and right-click the wireless card properties. Find IPv4 protocol.
1. The SIM card is in poor contact. Solution: Unplug the SIM card to check before inserting it.
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2, external electromagnetic interference. Solution: Stay away from distractions.
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3. External buildings block the signal. Solution: Get out in the open.
Router network cable connection error: WiFi connection but not online, first of all, you can check whether the wired network is normal, if the wired network is also not connected, then you need to check whether the router's network cable connection is correct, usually, the router's WAN port is connected to the optical cat network port, if the WAN port network cable is loose, the WiFi connection will be connected but there is no external network. You can access the router to view the network connection status