Bitbucket Cloud sends a request to the webhook URL containing the event payload.

Hi,
I have webhook that need to get the payload from bitbucket cloud.

I configured that I can get all traffic address like wrote in document:

104.192.136.0/21
34.198.203.127
34.198.178.64
34.198.32.85

When I'm trying to get the webhook in my server I got 503 status in request. (please see the attachment)

When I open the traffic to all over the world (0.0.0.0/0) everything works..

Have new address that I need to configure?

note:
I configured the webhook few years today ago and everything works till 2018.11.29