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    Ck 12 Foundation outage history

    25 recorded Ck 12 Foundation incidents since January 2019, with official updates, affected components, duration and resolution information.

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    Site unavailable

    Started June 4, 2025 at 9:00 PM UTC · 0m

    Pending
    1. June 4, 2025 at 11:52 PM UTCresolved

      CK-12 was unavailable from 2:00 PM to 3:15 PM PST. The issue has been resolved, and we apologize for any inconvenience caused.

    Assessment pages (Practice and Quiz) not loading properly

    Started April 9, 2024 at 1:30 PM UTC · 3h 35m

    Pending
    1. April 9, 2024 at 2:56 PM UTCmonitoring

      We noticed an increase in errors around 6:30am PT this morning. We have identified the issue and implemented a fix.

    2. April 9, 2024 at 5:05 PM UTCresolved

      This incident has been resolved.

    Assignment Submissions Failing

    Started March 13, 2024 at 4:25 PM UTC · 2h 47m

    Pending
    1. March 13, 2024 at 4:25 PM UTCidentified

      The issue has been identified and a fix is being implemented.

    2. March 13, 2024 at 4:30 PM UTCmonitoring

      A fix has been implemented and we are monitoring the results.

    3. March 13, 2024 at 7:12 PM UTCresolved

      This incident has been resolved.

    Elevated Errors and Slowdown

    Started February 21, 2024 at 8:29 PM UTC · 1h 50m

    OutageMajor incident
    1. February 21, 2024 at 8:29 PM UTCinvestigating

      We are currently investigating this issue.

    2. February 21, 2024 at 8:37 PM UTCinvestigating

      We are continuing to investigate this issue.

    3. February 21, 2024 at 8:37 PM UTCmonitoring

      A fix has been implemented and we are monitoring the results.

    4. February 21, 2024 at 10:19 PM UTCresolved

      This incident has been resolved.

    Investigating an issue with sign in

    Started January 12, 2023 at 5:48 PM UTC · 6h 14m

    Pending
    1. January 12, 2023 at 5:48 PM UTCinvestigating

      We are currently investigating an issue with signing in.

    2. January 13, 2023 at 12:02 AM UTCresolved

      This incident has been resolved.

    Some FlexBooks are not loading correctly

    Started September 14, 2022 at 4:05 PM UTC · 13h 56m

    Pending
    1. September 14, 2022 at 4:05 PM UTCinvestigating

      We are currently investigating this issue.

    2. September 14, 2022 at 5:11 PM UTCidentified

      The issue has been identified and a fix is being implemented.

    3. September 15, 2022 at 6:01 AM UTCresolved

      This incident has been resolved.

    Elevated errors when assigning practice

    Started May 31, 2022 at 4:00 PM UTC · 0m

    Pending
    1. May 31, 2022 at 11:43 PM UTCresolved

      For about 90 minutes we noticed that some users had trouble assigning practice to their classes. If you faced any issues from 9:00 AM PT - 10:30AMPT this was related to a production issue that is now resolved. If you continue to face any problems please reach out to [email protected] for additional assistance. We apologize for any inconvenience caused.

    Site Unresponsive Pages not loading

    Started January 14, 2022 at 3:00 PM UTC · 3h 34m

    Pending
    1. January 14, 2022 at 4:56 PM UTCinvestigating

      We are currently investigating this issue.

    2. January 14, 2022 at 5:08 PM UTCmonitoring

      A fix has been implemented and we are monitoring the results.

    3. January 14, 2022 at 6:34 PM UTCresolved

      This incident has been resolved.

    Slowness and Timeouts

    Started September 13, 2021 at 6:51 PM UTC · 6h 18m

    Pending
    1. September 13, 2021 at 6:51 PM UTCinvestigating

      We are investigating an issue where sign ins are slow and some timeouts are occuring

    2. September 13, 2021 at 9:01 PM UTCmonitoring

      A fix has been implemented and we are monitoring the results.

    3. September 14, 2021 at 1:09 AM UTCresolved

      This incident has been resolved.

    Timeouts and Slowdown

    Started August 24, 2021 at 5:22 PM UTC · 2h 37m

    Pending
    1. August 24, 2021 at 5:22 PM UTCmonitoring

      A fix has been implemented and we are monitoring the response times

    2. August 24, 2021 at 7:59 PM UTCresolved

      Our fix has stabilized www.ck12.org. We will continue to monitor this issue.

    Timeouts and Slowdown

    Started August 23, 2021 at 7:00 PM UTC · 0m

    Pending
    1. August 24, 2021 at 5:20 PM UTCresolved

      We are currently investigating this issue.

    Course copy assignments not loading

    Started March 31, 2021 at 1:17 PM UTC · 7d 21h

    Pending
    1. March 31, 2021 at 1:17 PM UTCinvestigating

      We are experiencing an issue preventing course copy assignments from loading. We are investigating. We apologize for the inconvenience.

    2. April 8, 2021 at 10:35 AM UTCinvestigating

      We are continuing to investigate this issue.

    3. April 8, 2021 at 10:35 AM UTCidentified

      The issue has been identified and a fix is being implemented.

    4. April 8, 2021 at 10:35 AM UTCmonitoring

      A fix has been implemented and we are monitoring the results.

    5. April 8, 2021 at 10:35 AM UTCresolved

      This incident has been resolved.

    Practice Service Interruption

    Started February 3, 2021 at 3:00 PM UTC · 0m

    Pending
    1. February 3, 2021 at 4:54 PM UTCresolved

      Practice and Quiz had a higher number of errors than usual. We were alerted of the issue and resolved it around 8:30am PST. This issue started around 7AM PST today. We are continuing to monitor and apologize for any inconvenience caused.

    Performance Degradation

    Started October 22, 2020 at 1:30 PM UTC · 0m

    Pending
    1. October 22, 2020 at 3:38 PM UTCresolved

      We noticed a slow down in some of our backend services. We have deployed a fix and the issue 7:30am PT.

    FlexBook 2.0 not loading in Safari

    Started October 22, 2020 at 6:26 AM UTC · 3h 23m

    Pending
    1. October 22, 2020 at 6:26 AM UTCinvestigating

      We are currently facing issues with FlexBook 2.0 loading in Safari. Our team is actively working on a fix

    2. October 22, 2020 at 6:27 AM UTCinvestigating

      We are continuing to investigate this issue.

    3. October 22, 2020 at 9:47 AM UTCidentified

      We have identified the issue and are applying a fix.

    4. October 22, 2020 at 9:49 AM UTCresolved

      This incident has been resolved with the previous patch.

    Assignment creation failing

    Started October 9, 2020 at 5:07 AM UTC · 10h 53m

    Pending
    1. October 9, 2020 at 5:07 AM UTCinvestigating

      We are investigating an issue preventing assignment creation. We are working on a fix. We apologize for the inconvenience.

    2. October 9, 2020 at 5:12 AM UTCidentified

      The issue has been identified and a fix is being implemented.

    3. October 9, 2020 at 12:32 PM UTCmonitoring

      A fix has been implemented and we are monitoring the results.

    4. October 9, 2020 at 4:00 PM UTCmonitoring

      This issue is resolved with our latest fix. If you are facing any issues please send an email to [email protected]

    5. October 9, 2020 at 4:00 PM UTCresolved

      This incident has been resolved.

    Group creation failures

    Started October 6, 2020 at 4:30 PM UTC · 0m

    Pending
    1. October 9, 2020 at 5:05 AM UTCresolved

      We experienced an issue where group creations were failing. We administered a fix. The issue occurred from 9:45 am - 11:45am PT

    Site slow down

    Started September 14, 2020 at 3:30 PM UTC · 0m

    Pending
    1. September 14, 2020 at 4:14 PM UTCresolved

      We noticed a spike in usage that cause a slowdown. We have added a fix and services are up and running correctly now.

    Elevated Practice/Quiz Errors and slowdown

    Started September 3, 2020 at 4:45 PM UTC · 6h 29m

    Pending
    1. September 3, 2020 at 4:45 PM UTCinvestigating

      We are currently investigating this issue.

    2. September 3, 2020 at 4:45 PM UTCinvestigating

      We are investigating and issue with practice / quiz errors and slowdown

    3. September 3, 2020 at 7:04 PM UTCidentified

      We identified a connectivity issue which is resolved now. We are making some improvements to prevent this issue from happening in the future.

    4. September 3, 2020 at 7:05 PM UTCmonitoring

      We are currently monitoring the issue.

    5. September 3, 2020 at 11:14 PM UTCresolved

      This issue has remained stable since 9:20am PST this morning.

    Unexpected Maintenance Page

    Started August 24, 2020 at 7:30 PM UTC · 0m

    Pending
    1. August 25, 2020 at 9:18 PM UTCresolved

      System was down for unexpected maintenance from 12:20 - 12:45pm.