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• Network Problems


  • Unplugged Network Cable
  • Website Temporarily Offline
  • IP Address Conflicts
  • Computer Firewall Malfunctions
  • Outside Wireless Signal Range
  • Wireless Network Configuration
  • Broadband Router or Access Point Malfunctions
  • Blocked By Your Service Provider
  • Computer Glitches
  • Network Downtime
• Unplugged Network Cable


  • Unplugged or loose network cables are one of the most common reasons why you might suddenly find yourself unable to connect to the Internet
  • On wireless networks, the wireless-fidelity (Wi-Fi) radio can be inadvertently shut off instead
  • On home networks, it's also possible that someone unplugged the router
• Action for Unplugged Network Cable


  Ensure your wired or wireless network hardware is switched on and plugged in
• Website Temporarily Offline


  What may seem to be a network problem connecting to the Internet is sometimes simply a Web site (or whatever server is on the other end of the connection) being temporarily offline
• Action for Website Temporarily Offline


  Try visiting several popular Web sites rather than just one
• IP Address Conflicts


  If your computer and another on the network both have the same IP address, the conflict between them will prevent either from working properly online
• Action for IP Address Conflicts

  Manually change your IP to a different number
• Computer Firewall Malfunctions


  • Firewall software running on most computers is intended to prevent unwanted network traffic from disrupting its operation
  • When two software firewalls, such as Windows Firewall plus a third-party product, are installed on the same computer, contention between the two can also incorrectly block traffic
• Action for Computer Firewall Malfunctions

  Temporarily disable the firewalls to determine whether it may be the cause of Internet connection problems
• Outside Wireless Signal Range

  • The performance of Wi-Fi network connections depends on distance between the device and the wireless access point
  • The farther away a Wi-Fi device is, the slower the local connection generally runs, until it breaks altogether
  • Wireless signal interference in the area can also limit the effective range of a Wi-Fi connection
• Action for Outside Wireless Signal Range

  • Measure the strength of your wireless signal and try these ideas to expand the range of your Wi-Fi:
  • Place the router at a height in some central location and away from other cordless devices
  • Avoid placing the router near something metallic or mirrors
  • Replace the omni-directional antennas with more powerful uni-directional antennas
• Wireless Network Configuration


  • Wi-Fi networks with encryption options like WPA or WEP turned on require computers to use matching security keys when connecting
  • If someone changes the encryption keys or password on the access point, devices that worked before will suddenly be unable to establish sessions and Internet connections
  • If the access point settings are changed to require using a specific Wi-Fi channel number, some computers may be unable to discover it
• Action for Wireless Network Configuration


  • Confirm that the Wi-Fi channel number and encryption keys on your router have not recently changed
  • When using a hotspot, follow the provider's instructions for signing in carefully
• Broadband Router or Access Point Malfunctions


  • Technical glitches with the router can prevent computers from connecting to the Internet
  • Router failures are caused by overheating, excessive traffic, or simply a faulty unit
  • Typical symptoms of a flaky router include computers on the network not being able to obtain IP addresses, or the router console not responding to requests
• Action for Broadband Router or Access Point Malfunctions


  • Check the router's lights and console to ensure it is running and responding properly
  • Troubleshoot and reset the router if necessary
  • Change the old router if necessary
• Blocked By Your Service Provider

  • Internet Service Providers (ISPs) can choose to block access from your account if you fail to make payment or otherwise violate the provider's Terms of Service
  • Reasons an ISP might block your account include exceeding bandwidth caps, sending spam e-mail, and downloading illegal or inappropriate content
• Action for Blocked By Your Service Provider


  Contact your ISP if you suspect your account has been blocked
• Computer Glitches


  • A computer's network adapter hardware might suddenly fail due to overheating or age
  • Failures in the operating system software that control the adapter can occur frequently especially with computers that are heavily used
  • Viruses and worms may disable or block a computer's network interfaces from functioning properly
  • Transporting a laptop or other mobile device from one location to another can corrupt the state of its network
• Action for Computer Glitches


  • Check the computer and remove any malware
  • On Windows computers, try resetting the network connection
  • Reboot the computer if necessary
• Network Downtime


  • Satellite Internet service may experience downtime during periods of very bad weather
  • Providers in dense urban areas (including cellular Internet carriers) sometimes are unable to support peaks in network traffic that causes sporadic outages for some customers
  • Those who subscribe to newer or more complex forms of Internet services (such as fixed wireless broadband) may experience more downtime than others as providers encounter more issues with relatively less mature equipment
• Action for Network Downtime

  • Contact your Internet provider to verify whether they are experiencing an outage
  • Some providers also give advice on troubleshooting problems connecting to their network