webhook is disabled

[ShubhamAg2]

How can I enable the webhook once it is marked as disabled? 

[shikhartanwar]

You can do the below:
1. Ensure that the consumer application is processing events successfully and is returning 2XX response.
2. Once the consumer application is restored, please update your event registration on Developer Console to reset its status.

[ShubhamAg2]

As I am processing an event, first it returns 200 and after 2 to 3 seconds it returns 500 in response

[shikhartanwar]

The 500 error is coming from the Runtime action. I/O Events attempts to deliver the event, and if it encounters a 5xx error, it retries. What you're likely seeing is the event being retried.