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.
Open your guide to re-select the channel you’re watching, or change to a different channel and change back.
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
Once that information is collected, please contact us. Your agent may have additional steps to help you resolve the issue.