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Solved: Sudden Loss of WiFi Connectivity

Discussion in 'Networking' started by Penelope Pitstop, Feb 18, 2009.

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  1. Penelope Pitstop

    Penelope Pitstop Thread Starter

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    Feb 18, 2009
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    I have just read through a thread dated 15.02.09 about a sudden loss of WiFi connectivity. It is similar to what I am attempting to resolve. It seems that after the Microsoft up-dates on 15th or 16th Feb the WiFi connectivity was affected. I am running a Netgear router on an XP machine with a remote Vista machine. The remote Vista machine can access the internet. The XP machine can access the internet. The LAN is connected and both machines appear on the network but access to the either machine is denied. Any suggestions to help resove this situation or interrogate the system?

    Looking forward to speaking to someone soon.
     
  2. JohnWill

    JohnWill Retired Moderator

    Joined:
    Oct 19, 2002
    Messages:
    106,418
    Check the firewalls.


    Turn off any firewalls for debugging. If the firewall is the problem, you'll have to configure it to allow access to "trusted zone" addresses. Note that some firewalls must be completely uninstalled to stop them from affecting your networking.

    Hold the Windows key and press R, then type CMD to open a command prompt.

    In the command prompt window that opens, type type the following commands:

    PING each remote computer by IP address, and if successful, PING by name. Open a command prompt as described above and type.

    PING <ip address>
    or
    PING <computer name>

    Where:
    <ip address> - is the x.x.x.x IP address
    <computer name> - is the computer name

    A failure to PING is almost always a firewall configuration issue. Any failure to PING needs to be corrected before you go any farther.

    Note: You can obtain the IP address and computer name of a computer by opening a command prompt (DOS window) and typing IPCONFIG /ALL. This should work for any Windows version. The IPCONFIG /ALL display will provide a wealth of useful information for debugging your network connection.

    Check your Services are Started on all PCs:
    • COM+ Event System (for WZC issues)
    • Computer Browser
    • DHCP Client
    • DNS Client
    • Network Connections
    • Network Location Awareness
    • Remote Procedure Call (RPC)
    • Server
    • TCP/IP Netbios helper
    • Wireless Zero Configuration (XP wireless configurations)
    • WLAN AutoConfig (Vista wireless configurations)
    • Workstation

    Note: You can check the services in Control Panel, Administrative Tools, Services.

    All of these services should be started, and their startup type should be automatic.

    If a service is not running, open it's properties and check the dependencies. Check each of the dependencies and see which one is preventing the service from running. Checking the event log is also a good idea here, there may be clues to what is failing.


    All computers should be in the same workgroup for computer browsing to function properly. File & Print Sharing has to be enabled on any computer you wish to share files or printers from. You also need to actually share the resource in question from My Computer, right click on the drive/printer/folder, and select sharing.

    If you encounter difficulties accessing computers that are visible in Network Places (Network and Sharing Center in Vista), make sure the computer being accessed has an account with the same name/password as the system connecting to it uses to login.

    While the default NetBIOS setting is correct for normal network configurations, it's possible for it to be altered, and it costs nothing to make sure it's correct. NETBIOS over TCP/IP must be enabled for normal network browsing.
     
  3. Penelope Pitstop

    Penelope Pitstop Thread Starter

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    Feb 18, 2009
    Messages:
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    Thank you for your prompt response. I will go through the process as explained above and report accordingly. The entire system had been working for 4 months prior to this up-date. All folders on both machines appear but access is denied. Internet is available on both machines. Um, the firewall, at the time of inspection, this was turned off. Thanks
     
  4. JohnWill

    JohnWill Retired Moderator

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    The first test is pinging both ways by computer name. If that doesn't work, you need to resolve that first.
     
  5. Penelope Pitstop

    Penelope Pitstop Thread Starter

    Joined:
    Feb 18, 2009
    Messages:
    3
    Thank you for your assistance. I have now located the problem. It was the MacAfee Firewall which was interferring with the wireless communications. I have had to disable this firewall to resurrect the wireless network. Thanks again.
     
  6. JohnWill

    JohnWill Retired Moderator

    Joined:
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    Messages:
    106,418
    Thanks for the feedback. :)
     
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