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Sandbox's Webhooks works with webhookinbox but do not reach the server with ngrok

Dear developer community, 
I am new to and have an issue with webhooks.
it works fine with webhookinbox, but when I tried with ngrok (http tunnelling) my server did not receive anything.
    "status": 500,
    "reason": "PING_FAILED",
    "message": "An error occurred while processing the request. Please note the correlation id for the request and contact Support for more details.",
    "correlationId": "99097dd9-e402-4692-80a7-5b51ab0e3449",
    "details": [
            "message": "Error occured in connecting to the endpoint: "
While it works fine when i call the same url directly with curl 

curl -X POST -H 'x-anet-signature: foo' -H 'expect: 100-continue' -d "bar"

I suspect it is due to the "expect: 100-continue" in the header, but I am not sure and I do not know how to disable this from ?
Perhaps I am doing something wrong, but the support told me to reach the developer community.
Has anybody already use's webhooks with ngrok ?

If someone can help me, it would be great.

Thanks in advance