After being DDOSed (cf. What just happened to Stack Overflow?) StackOverflow works again and Meta.SO obviously, as well. I also noticed, that superuser.com works. But all subdomains of stackexchange.com are still down (I actually did test only some of them).

Are there known reasons? Can someone tell something about a time span, how long this will last?

IS the actual problem now, that perhaps thousands of users continiously are pinging their favorite SE site?

  • Well, more and more SE sites are going back up, but I have no clue how long it will be for all of them to go back up Feb 16, 2014 at 21:31
  • @GeoffDalgas I see you marked this status-completed, but please see meta.judaism.stackexchange.com/q/1956.
    – msh210
    Feb 17, 2014 at 19:23
  • 1
    Thanks for the notification @msh210 - I have pushed a change for this domain. Feb 17, 2014 at 19:54

3 Answers 3


We have performed a DNS change to mitigate a DDOS attack. Hopefully your favorite Stack Exchange site will be coming back to life here in a bit. We are monitoring the situation closely.

  • Remark: Users should also flush the DNS cache on their local machines.
    – Speravir
    Feb 16, 2014 at 22:05

This is funny (in Ask Ubuntu only 10kers):

enter image description here

  • 15
    Could be real, or could just be some lozer who thinks they're being funny. I'm leaning towards the latter.
    – user102937
    Feb 16, 2014 at 22:22
  • 3
    @RobertHarvey could be taking credit for someones work D:.
    – Braiam
    Feb 16, 2014 at 22:24
  • @Speravir: It's almost certainly deleted by now.
    – user102937
    Feb 16, 2014 at 22:24
  • 2
    @RobertHarvey They've been threatening this for a while now..
    – ɥʇǝS
    Feb 16, 2014 at 22:24
  • So I guess I wasn't wrong when I said this: meta.stackexchange.com/questions/221418/…
    – Mysticial
    Feb 16, 2014 at 22:25
  • @Mysticial Nope.
    – ɥʇǝS
    Feb 16, 2014 at 22:26
  • @GuilhermeBernal: Already deleted. Screenshot: i.stack.imgur.com/BzpBN.png
    – Speravir
    Feb 16, 2014 at 22:41
  • LOL! That's so stupid.
    – William
    Aug 1, 2014 at 19:07

From my side it looks like the Stack Exchange Network is doing a failover which impacts the IP adresses for the servers. For all domains the DNS records has to be updated and then those updates need to propagate to all DNS servers and finally your own box.

The updating takes time. Maybe because a human has to enter the new IP addresses in some management console at an ISP hosting the DNS.

  • Thanks, René. It’s mean, that an admin answered, too. ;-)
    – Speravir
    Feb 16, 2014 at 22:13
  • That is the only truth...I upvoted Geoff his answer
    – rene
    Feb 16, 2014 at 22:14

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