When a validation or deployment is started in Gearset, the package that Gearset has built is uploaded using the Salesforce metadata API and queued for deployment. 

One of the limitations of the metadata API is that cancellation isn't well supported during certain operations including validating or deploying. However, you can request cancellation from within the Setup menu of the target org. 

To request cancellation, you need to:

  1. Log into the target Salesforce org.
  2. Filter the Setup menu to find Deployment Status.


3.  You'll see any deployments or validations that are in progress, and you can request cancellation.

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