Since Windows Media Player is the default media player in Windows for both sound and video, it is used whenever you open a music file or video file. Even when you play online video or audio, Windows Media Player is often used for the playback.

In some cases when trying to play a multimedia file with Windows Media Player, you can get an error that shows error code COOD11B1. The error has been reported in all the recent version of Windows Media Player, including 10, 11 and 12. Solving error COOD11B1 can be a challenge if you don’t know where to look. So here are a few ideas to fix the error based on experiences with this error:

  • First of all, make sure your Internet connection is working properly and that the firewall is not blocking Windows Media Player. The digital rights management functionality will need online access, and downloading missing codecs also requires an active Internet connection.
    Make sure to check both the software firewall in Windows, as well as any firewall on your router.
  • Second of all, you need a working audio device, so make sure the audio device is working and the Windows Audio service is running. If necessary, check and update your audio drivers.
  • In the Options of Windows Media Player, make sure the option to Download codecs automatically is selected.
    Automatically download audio codecs
  • Also in the Options of Windows Media Player, select the Network tab, and select or deselect the network protocols used for multimedia streaming.
    Selecting only HTTP and TCP can help solve problems with the network configuration, as the UDP protocol is often blocked. You can also configure the range of ports that will be used for media streaming, but that means you also need to make sure they are open in the firewall.
    WMP network protocols for streaming
  • Although Windows Media Player should automatically download missing codecs, installing a codec pack can sometimes help solve error COOD11B1 immediately. The K-Lite codec pack is one of the better codec packs around.
  • If you are dealing with a local multimedia file, you can try using a different media player, like the VLC media player. It is a very small, free multi media player that plays almost anything.
  • Some versions of Windows Media Player might need to upgrade the security component that is used in the Digital Rights Management function, which is not automatically updated by Windows Update. Check the Microsoft website for this (open it in Internet Explorer, as the button does not work in FireFox).
  • In some cases error COOD11B1 can be caused by the Internet Explorer, so try clearing the Temporary Internet files completely, and reset IE by:
    1. Open the Tools menu (press the Alt key if you don’t see the menu)
    2. Select Internet Options
    3. Select the Advanced tab
    4. Click the Reset button
      Reset Internet Explorer
  • If you are playing an MP3 file, it is possible that the MP3 file has an ID3 tags that are in a compressed headers. The error can be solved by editing the MP3 file and removing the ID3 tags from the file.
  • The last possible solution we mention is the scenario where a MBR file or online media stream contains more than 32 media streams. In Windows XP and Vista, this can be a problem, but Microsoft has a hotfix for this error.

When the solution does not immediately work, try restarting your computer. Not all changes take effect immediately in Windows, so rebooting should ensure the change is active and hopefully help solve error COOD11B1.

6 Responses to “How to Fix Error COOD11B1 in Windows Media Player”

  1. […] the Media Player configuration, make sure that you configure it to download codecs automatically. That way missing codecs will be automatically downloaded if a video file is played for which no […]

  2. I have been exploring for a little bit for any high quality articles or blog posts on this sort of area

  3. Rick says:

    it worked =)

  4. Geoff says:

    @Rick – I am glad it fixed the error for you!

  5. ERROR COOD11B1 says:


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