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  1. #1

    DNS server isn't responding

    Model :

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    Firmware Version :

    ISP : [/COLOR]


    I have a WPA-4220 which is paired with a WPA 411 at the modem.

    I am increasingly frequently losing internet connectivity (but not wireless). When I diagnose I am being informed "the DNS server isn't responding". Any assistance is greatly appreciated.


  2. #2

    DNS server issue

    The device will not be able to reach the Internet when these failure conditions occur. Step-by-step network troubleshooting steps can be used to diagnose and repair the problem as described below
    [h=3]How to Run Windows Network Diagnostics[/h]On Microsoft Windows PCs, the Windows Network Diagnostics can be run to help diagnose Internet connection problems. if not sure whether your computer is reporting DNS Server Not Responding errors, follow these steps:
    1. Open WIndows Control Panel
    2. Open the Windows Network and Sharing Center
    3. Click the "Troubleshoot problems" link under "Change your networking settings"
    4. Click "Internet Connections" under "Network". A new Internet Connections window appears.
    5. Click Next
    • Click "Troubleshoot my connection to the Internet"
    • Wait for the troubleshooting tests to complete and look in the "Problems found" section of the window for the error message.
    [h=3]How to Fix DNS Server Not Responding Issues[/h]To properly fix these Internet connection failures requires first isolating the problem down to its root cause.

    common causes of these failures:
    • misbehaving Internet provider
    • malfunctioning TCP/IP or DHCP services
    • overly aggressive antivirus software
    • malfunctioning router or modem
    If not confident that your Internet connection issues are truly related to DNS, try general connection troubleshooting techniques
    [h=3]Resolving TCP/IP and DHCP Failures[/h]Itís possible for the TCP/IP software inside a client deviceís operating system to malfunction and set its DNS server addresses incorrectly. Rebooting a Windows computer often clears these temporary glitches.

    A more elegant solution involves running TCP/IP utility programs that perform the standard procedure to "release and renew" the Windows IP address settings

    Similarly, most TCP/IP networks use the Dynamic Host Configuration Protocol (DHCP) service to assign IP addresses to clients. DHCP assigns not only the device's private IP address but also primary and secondary DNS server addresses. If DHCP is malfunctioning, a PC reboot is likely required to recover it.

    Check to ensure both your device and the network router both have DHCP enabled. If either end of the connection is not using DHCP, Internet connection errors normally result.
    [h=3]Handling DNS Provider Issues[/h]Many people configure their home networks to automatically obtain DNS server addresses from their Internet provider. When the provider's servers or network suffer an outage or are heavily loaded with traffic, their DNS services can suddenly stop working. Customers must wait until the provider fixes those issues before they can use the provider's DNS.
    As an alternative to the private DNS servers supported by each provider, several free public DNS servers have been established on the Internet, most notably by Google and OpenDNS.
    A router administrator can switch their network's DNS setup over from a private to a public DNS configuration if they so choose by manually entering the public DNS IP addresses into the router configuration settings.

    Administrators can choose to do this temporarily in emergency situations only, or they can make it a permanent change (and many households do). Note that DNS settings can also be applied on the Windows device itself via Network and Sharing Center.

    However, this usually will not work as a permanent solution as devices normally obtain and override their local settings with those from the router via DHCP.

    [h=3]Avoiding Internet Blockages from Antivirus Programs[/h]Antivirus programs that people install on their Windows PCs are designed to keep intruders out, but they also have the capability to block Internet access if they detect a misbehaving device.
    Most antivirus programs work using special database ("dat") files that the software vendors automatically update on a regular basis. PC users often don't realize when these install updates happen as they are triggered in the background and designed to not interrupt normal work

    . Unfortunately, sometimes mistakes are made with these dat updates that cause the antivirus program to believe a computer is infected when really it is a false alarm ("false positive" test). These false positives can trigger WIndows to suddenly start reporting DNS Server Not Responding errors.

    To verify whether this is the cause for your device, temporarily disable the antivirus program and re-run the Windows Network Diagnostics. Then consult the antivirus vendor for either a new update or technical support. Although disabling antivirus does not work as a permanent solution, doing so to temporarily to troubleshoot the problem is normally (not always) safe.
    [h=3]Recover or Replace a Malfunctioning Router or Modem[/h]A misbehaving broadband router or broadband modem can trigger these DNS error messages on home network devices. Restarting the router and modem will resolve intermittent router glitches,at least temporarily. For more, see: Best Ways to Reset a Home Network Router.
    Routers and modems must eventually be replaced if they continue to exhibit failures.

    However, it is extremely unlikely for either to fail in such a way that would cause DNS errors to be regularly generated. Failed routers and modems normally cannot power on at all or else generate errors related to the underlying network connection itself.

    If connecting to the router via a wired Ethernet port, try moving the Ethernet cable to use a different port instead.

    You can get some knowledge about servers at:

  3. #3

    DNS server isn't responding

    Perfect idea, What you can do is Troubleshoot the issue stepwise and get the unwanted stuff removed and your error can be solved, and you can have an update for WPA-4220.


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