For the last several hours, SlideShare has been experiencing an extremely heavy distributed denial of service (DDOS) attack. What seems to be going on is that a large botnet is trying to take down our site. The attack was fully saturating the entire network connection at our hosting provider (several 10Gbps uplinks).

Right now the site is down. More updates as they become available.

Update (Apri 19th, 7 AM PST)
: The site is back to normal now…

Update (Apr 19th, 2 PM PST): Several people are reporting problems, though others can reach site. Attack continues though it is weaker than before.

Update (Apr 19th, 3 PM PST): All clear now. Attack is no longer on. You should be able to reach SlideShare without problems. If you do have problems, please let us know and we will look at it.

Update (Apr 19th, 10 PM PST): The problem seems to be have resurfaced … the site is currently off air.

Update (Apr 20th, 4 AM PST): The problem seems to be under control at the present moment.. the attacks are continuing but have reduced in intensity.. slideshare is currently operational… stay tuned for updates…

19 Responses to “SlideShare experiencing DDOS attack”

  1. ?????? ????? ??? - ??? | ????? 2008 ??? says:

    […] SlideShare experiencing DDOS attack […]

  2. Jim Amos says:

    Hmm, seems like it is still down. 2:15pm EST

  3. jon says:

    Jim, where are you located? I can reach it. Let me look into our monitoring systems.

  4. g says:

    Can’t get through, 12pm pacific, from the sf bay area.

  5. Pam says:

    3:20 Eastern time…Virginia…can’t get in either :( Thanks for your help!

  6. sfmedia says:

    Having trouble uploading my presentation. Thanks.

  7. Peter Morville says:

    I’m trying to create my first slidecast. I’ve been waiting for my audio URL to be processed for two hours. Not sure if this is related to the DDOS attack or the surge in volume. I wish I could get an indication of how long it will take (or an option to get email when it’s finished).

    Best of luck getting things to flow smoothly again!

  8. SlideShare Slammed with DDOS Attacks from China says:

    […] these three failed attempts, SlideShare experienced a massive distributed denial of service attack starting at 10pm on Thursday, one day before the CNN website was attacked by Chinese instigators in […]

  9. Connie Crosby says:

    Thank you for keeping us posted. I’m glad the blog is still alive and well so you can let us know what is happening. We are rooting for you to be able to keep our content online and available for everyone’s use.

  10. Slideshare, the presentation sharing sit … « law.librarians says:

    […] Slideshare, the presentation sharing site, is apparently under attack by Chinese hackers. See: Slideshare blog and TechCrunch coverage. There is a question about who is behind this and why this would be […]

  11. Andy Wong says:

    This kind of attack was often done by a mix of “S h i t Youth” and the government internet agents of PRC. Some of them think that China is getting economically powerful, now they can export censorship overseas by all means. These attackers may not totally controlled by the government and some corrupted officers.

    “S h i t Youth” is a nick name of “Angry Youth” in Chinese sub-culture in the mainland China. In Chinese mandarin, “angry” sounds like “shit”.

  12. Andy Wong says:

    1. I demand you to take down that post because it violates my law, so it is illegal.
    2. If you don’t, I will bomb you with DDOS.
    3. Because you don’t, I bomb you now.
    4. Again, and again. I will make you in fear, and all your industries in fear, so in the future all your industries will do self-censorship for me to avoid attacks.

    Consequently, all your users will suffer.

    Sound familiar?

    Step 1 and 2, blackmail.
    Step 3, terrorism activity.

    If you are in US, please report the case to FBI which will delegate some tasks to Interpol. The People Republic of China is a member of Interpol. The authority of PRC has duty to cooperate in order to identify the initial calls to Slideshare, and the follow up attacks. Otherwise, the authority of PRC is proven to be incompetent .

  13. Who will save us from China? « Vijay Anand | The Startup Guy. says:

    […] lately. So while during one of the dinner meets with someone who is running a fairly successful - actually very successful - internet service, he mentioned how for the past four days his service is under DDoS attacks from China, because them […]

  14. Annoy says:

    Andy, shut up. Your Pathetic.

  15. SlideShare Slammed with DDOS Attacks from China | crown.MONKEY says:

    […] these three failed attempts, SlideShare experienced a massive distributed denial of service attack starting at 10pm on Thursday, one day before the CNN website was attacked by Chinese instigators in […]

  16. SlideShare Slammed with DDOS Attacks from China | crown.MONKEY says:

    […] these three failed attempts, SlideShare experienced a massive distributed denial of service attack starting at 10pm on Thursday, one day before the CNN website was attacked by Chinese instigators in […]

  17. KapilMohan.com » DDOS hosed SlideShare says:

    […] really frustrating to be DDOSed. Heard that. Read that. Now, experienced that. SlideShare is fighting the DDOS of worst kind, apparently sponsored by the Chinese. It has been […]

  18. TechCrunch Japanese ????? » SlideShare??????DDOS???????? says:

    […] ???3????????????SlideShare?????????????????????????????????????10??CNN??????????????????????????????????????????????????????????????????????????????????2.5GB/?????????????????????????? […]

  19. Icetoad says:

    most hosting companies now have anti-ddos equipment at their perimeter that prevent DDOS’s from taking down websites or servers.

    DDOS will be a thing of the past in the near future, just like DOS attacks.

    The question now will be… whats next?

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