21-20 errors can occur for a number of reasons, most commonly being for buffering or account authorization issues. You may see an orange spinning wheel on screen, or a completely black screen before this error pops up. 


We want to get you back to watching as quickly as possible, so try the steps listed below to resolve this error.



Relaunch Channel


If you’re receiving a 21-20 error on a specific channel, open your guide to re-select the channel you’re watching, or change to a different channel and change back.


Relaunch SLING


Force close the SLING app on your device, then relaunch. Get device-specific instructions below:


Relaunch the SLING app >


Restart Your Device


Perform a hard reset of your device, then try watching your programming again. 


Most hard resets can be performed by unplugging your device from a power source for 10 seconds, then plugging back in. If you need additional assistance, find device-specific steps linked below:


Restart Device >


Reset Your Internet Connection


Perform a reset of your router or other internet access point. 


This can typically be done by unplugging the device for 10 seconds, then plugging it back in. Once the reset cycle has completed, try, relaunching SLING.



If you’re unable to resolve the 21-20 error using the steps listed above, please take note of the following information:


  • When the error occurred (when selecting a show, in the middle of watching, etc.)

  • What type of program you were watching (live, on-demand, DVR recording)

  • What device you were using


Use the link at the very bottom of this page to contact us. Your agent may have additional steps to help you resolve the issue.