Can't create webhook subscription anymore [production]

Why can't I create a subscription for a webhook anymore? A week ago everything was working.

I've got:

com.ringcentral.RestException: HTTP Response
=============
status code: 400

Server: nginx
Date: Tue, 19 Apr 2022 18:02:49 GMT
Content-Type: application/json
Transfer-Encoding: chunked
Connection: keep-alive
LocalHostInfo: 10.120.28.92__20034@iad41-c01-csg11.c01.ringcentral.com
RCRequestId: eac2922a-c00a-11ec-ae27-0050569c35a6
X-ERROR-ID: eac2922a-c00a-11ec-ae27-0050569c35a6
X-Rate-Limit-Group: medium
X-Rate-Limit-Limit: 40
X-Rate-Limit-Remaining: 39
X-Rate-Limit-Window: 60
RoutingKey: IAD01P10

{
"errorCode":"SUB-521",
"message":"WebHook is not reachable",
"errors":[
{
"errorCode":"SUB-521",
"message":"WebHook is not reachable"
}
]
}

Even the incoming request, to check the address/endpoint, don't come anymore.

I've checked and I definitely can hit the address/endpoint from external.

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Could it be possible that your server receiving the webhook is behind some firewall or in a private network?
You might be able to hit it since you are part of the same network
Could you try hitting the webhook from a public network just to be sure?
Also, make sure your webhook endpoint responds within 3 seconds when receiving a GET request so that RingCentral knows it's up and running

Did you see Yatin's comment below? This is the most likely reason for the problem you are having. Can you share the URL so we can see if we can hit it?

I've checked by 'https://portchecker.co' if my '6f48022e8fe2.sn.mynetname.net:3333' is accessible from external - the port is OPEN.

But I still have (without any incomming request):

com.ringcentral.RestException: HTTP Response

=============

status code: 400

Server: nginx

Date: Wed, 20 Apr 2022 12:38:45 GMT

Content-Type: application/json

Transfer-Encoding: chunked

Connection: keep-alive

LocalHostInfo: 10.120.28.93__17316@iad41-c01-csg13.c01.ringcentral.com

RCRequestId: cf597584-c0a6-11ec-8ca4-0050569c35a6

X-ERROR-ID: cf597584-c0a6-11ec-8ca4-0050569c35a6

X-Rate-Limit-Group: medium

X-Rate-Limit-Limit: 40

X-Rate-Limit-Remaining: 39

X-Rate-Limit-Window: 60

RoutingKey: IAD01P10

{"errorCode":"SUB-521","message":"WebHook is not reachable","errors":[{"errorCode":"SUB-521","message":"WebHook is not reachable"}]}

HTTP Request

============

HTTP POST https://platform.ringcentral.com/restapi/v1.0/subscription

Authorization: ??

X-User-Agent: RC-JAVA-SDK Java 1.8.0_221 Windows 2003

{"eventFilters":["/restapi/v1.0/glip/webhooks"],"deliveryMode":{"transportType":"WebHook","address":"https://6f48022e8fe2.sn.mynetname.net:3333/","encryption":true,"verificationToken":"******"},"expiresIn":63072000}

at com.ringcentral.RestClient.requestRaw(RestClient.java:316)

at com.ringcentral.RestClient.request(RestClient.java:328)

at com.ringcentral.RestClient.request(RestClient.java:257)

at com.ringcentral.RestClient.post(RestClient.java:148)

at com.ringcentral.paths.restapi.subscription.Index.post(Index.java:49)