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Unable to access certain websites: "destination host unreachable"?

Discussion in 'Networking' started by sb3700, Dec 2, 2008.

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  1. sb3700

    sb3700 Thread Starter

    Joined:
    Dec 2, 2008
    Messages:
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    Whenever I try to access www.dlink.com (or subdomains), or www.dzone.com, I get a "Connection closed by remote server" error in Opera (similar messages in other browsers).

    When I try to ping or tracert either of the hosts, I get a "Destination host unreachable" error.

    This has also occurred on other websites, which I cannot remember right now, and occurs with both Optus (my ISP) and OpenDNS as dns servers.

    It also seems to be intermittent. Yesterday, I was able to access www.dzone.com without any issues for some time, yet today and the day before, this error was occurring.

    Also, possibly unrelated, the website www.tv.com is extremely slow when loading.

    Does anyone have any ideas as to what the issue is?

    The traceroute and ping work fine from network-tools.com, so it must be something from my end.

    The IP's are resolved correctly (when I ping or tracert, the IP shown is correct according to OpenDNS's cache). However, when typing either the hostname or the IP in the address bar, I still get the error.

    Thanks for reply.

    Edit: Also, a ping from my router is "successful", ie: in firmware, there is an option to ping hosts, and this returns successful. All firewalls are disabled.

    Additionally http://www.dictionary.com does not work, but the basically aliased http://dictionary.reference.com/ does. However most of the images in http://dictionary.reference.com are served from http://sp.ask.com/ which doesn't load, whereas http://ask.com does. Very weird... :-[
     
  2. CronoT

    CronoT

    Joined:
    May 22, 2007
    Messages:
    82
    Sounds like you've got a DNS issue. Those are handled by your ISP, so you're pretty much screwed if that's the problem. Here's how to check your DNS connections:

    1. Open a command prompt Start -> Run... -> cmd.
    If you're using Vista, the command prompt is under the Accessories Menu.

    2. At the prompt, type ns lookup, and hit enter. This puts your command prompt into Domain Naming Service lookup mode, meaning you can try to resolve websites' names and ip's from their websites.

    3. Type the web address of a known website, such as yahoo.com or google.com, and hit enter. You should get the name and the ip address of the site in the command prompt window.

    4. Once you've found one that works every time, this will be your Control site. You know it works, so you use it to check your connection.

    5. Now, use the address of one of the sites that's not working. If you do get a reply from the site, then the problem isn't with your ISP. You'll need to check your connection speeds and other network settings to test the problem further. If the websites don't resolve, contact your ISP, and tell them their DNS isn't working properly. You're going to need to get to someone fairly high up the food chain, so be ready to be really patient for that part.
     
  3. sb3700

    sb3700 Thread Starter

    Joined:
    Dec 2, 2008
    Messages:
    2
    I don't think it is a DNS issue. Hostnames are resolved correctly, as can be shown by doing a ping of opera.com from cmd.

    The output is:
    Code:
    Pinging opera.com [195.189.143.135] with 32 bytes of data:
    
    Destination host unreachable.
    Destination host unreachable.
    Destination host unreachable.
    Destination host unreachable.
    
    Ping statistics for 195.189.143.135:
        Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
    So the host has been resolved. Also, the problem is with both my ISP's dns and OpenDNS, so dns is not the issue.

    Also, the problem exists either on my computer or my router, as using an online utility, such as http://network-tools.com/ works, as does pinging from my router.

    Firewalls are disabled.

    Also, like I said, it is only some sites, but I am unable to find a pattern between these sites.

    Any other ideas.
     
  4. CronoT

    CronoT

    Joined:
    May 22, 2007
    Messages:
    82
    Disconnect your Router and go directly to the modem. Also, try defaulting your router. What brand router is it, what's your ISP, and what type is it?
     
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