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Domain Name System (DNS) troubles: Gmail blocked through openDNS

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  1.  
    • CommentAuthorshhash
    • CommentTimeJun 24th 2009 edited
     permalink
    when I tried to log into gmail, open dns blocked it, the same has happened with many.. what the heck is thus??
    DNS poisoned??

    look at this blog

    http://blogs.prashu.com/programming-and-development/content/2009/03/00292/gmail-blocked-through-opendns-open-safe.php

    now I've switched to "Advantage DNS" tell me when OPEN DNS is back to normal.
    • CommentAuthorrotblitz
    • CommentTimeJun 24th 2009
     permalink
    Are you using OpenDNS for pure DNS, or do you have an OpenDNS account with related network?

    As OpenDNS really(!) does not block anything (beside phishing sites and Conficker worm domains), you're probably using another OpenDNS user's settings, who did not keep his dynamic IP address updated in his OpenDNS dashboard. You now got "his" former IP address, therefore using his settings for filtering and blocking. Bad enough!

    Under this perspective, the blog article you mentioned is pretty stupid.

    What can you do to prevent from this? If you have a dynamic public IP address, disconnect from and reconnect to the internet to obtain another IP address from your ISP. Then you should be good to go. To more permanently prevent from happening this, you may maintain an OpenDNS account and keep your IP address updated in your OpenDNS dashboard (automatically with a related program). So YOU determine what is being filtered or blocked or not, if at all.

    "now I've switched to 'Advantage DNS'"
    Bad choice, as these guys really block stuff without user's choice, unlike OpenDNS.

    "tell me when OPEN DNS is back to normal"
    It is always at normal. But you still aren't. Go and get it changed!
  3.  permalink
    Well whoever put that blog up had the webmail category chosen for blocking.. of course it would block Gmail... simple solution.. either whitelist gmail.com or turn off the webmail category.. not really opendns's fault that for once there is a site that is correctly categorized.. not sure about the is not safe part though, somebody was a bit strict on their custom message..
  4.  permalink
    And:
    "DNS poisoned??"

    OpenDNS is about the last DNS server implementation that can be poisoned.
    • CommentAuthoressekco
    • CommentTimeJul 1st 2009
     permalink
    Same here can't access Gmail etc.Opendns blocked!
    • CommentAuthorrotblitz
    • CommentTimeJul 1st 2009
     permalink
    OpenDNS never ever blocks anything, beside phishing and Conficker sites, believe me.
    That's either you or your network administrator requesting OpenDNS to do so. That's a big difference, isn't it?

    So, as a consequence, get yourself or your network administrator to not request OpenDNS to block Gmail for you... :cool:
    • CommentAuthoressekco
    • CommentTimeJul 1st 2009 edited
     permalink
    I'm connect internet from home?And i don't change anything.Everything was fine but today suddenly OpenDNS start blocking several sites.I don't know why.I can connect that sites with using other dns adresses(instead of OpenDNS)
    • CommentAuthorrotblitz
    • CommentTimeJul 1st 2009 edited
     permalink
    So, you are intentionally using OpenDNS? http://welcome.opendns.com/

    Can you paste the URL of the block page you are landing here?

    Have you set up an OpenDNS network at https://www.opendns.com/dashboard/networks/ and is your IP address there in sync with your public IP address at http://myip.dnsomatic.com/ ?

    Edit: Why don't you follow the instructions given above?
    • CommentAuthoressekco
    • CommentTimeJul 1st 2009 edited
     permalink
    Yes i'm using OpenDNS since last 2 years.
    I can't write gmail link cause OpenDNS block after i loggin but i can link other site
    http://block.opendns.com/?url=6970877466798566838515688078&ablock (deviantart.com)

    I never try to add a network before
    But when i try to add my ip adress to network,it says "Network already exists"
    Edit:What instructions u talking about?
    • CommentAuthorrotblitz
    • CommentTimeJul 1st 2009
     permalink
    Yes, this is what I expected. You have picked up the dynamic IP address another OpenDNS user had before, so you are using his settings now. So follow the instructions above and in other threads to obtain another public IP address. If you are not able to do so for any reason, open a support ticket at http://www.opendns.com/support/contact/
    OpenDNS staff must release your current IP address out of the other OpenDNS account then.
    • CommentAuthoressekco
    • CommentTimeJul 1st 2009 edited
     permalink
    That funny.I can't connect sites cause somebody block that sites using OpenDNS dashboard with a dynamic IP adress.Do u think that was my fault and i need to work for that to unblock this sites.This is OpenDNS's job not mine.I can't try to fix everytime a dynamic ip blocked from other people.
    Edit: I open a support ticket,though
    Thankful People: rotblitz
  12.  permalink
    that's the problem with dynamic Ip addresses.. and No Opendns has no way to tell the the dynamic ip somebody else was using is now assigned to you if they aren't running the Ip Updater..

    Support ticket is the only way for Opendns to know that the Ip Has switched to you..
    Although it seems like they may be able to add something to the dashboard that checks the Ip address you are currently using and allows you to refresh and get it to use your settings instead of the other persons settings..
  13.  permalink
    essekco, you have a dynamic IP address and did not keep it updated, either. I do realize that this can be a pain for those who just want to use OpenDNS for nameservers only, but creating a network account and keeping your IP address updated are crucial to avoid the issues you are experiencing.

    To get a new IP address so you can create an account (or, I suppose, you could just do this every time you experience filtering), unplug your modem or router that connects you to your ISP for a time (about 5-30 minutes), and when you reconnect you should have been issued a new IP address.

    I would consider using that opportunity to Add A Network, and use the Updater or an update-capable router to keep your IP address in sync with your OpenDNS account.
    • CommentAuthorrotblitz
    • CommentTimeJul 1st 2009
     permalink
    @essekco
    "That funny. I can't connect sites cause somebody block that sites using OpenDNS..."
    Yep, I tend to agree with you.
    See http://forums.opendns.com/comments.php?DiscussionID=4134#Item_21

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