We'd like to inform you about a service outage regarding the Messaging API. The issue has now been resolved but we sincerely apologize for any inconvenience that this may have caused.
# Date and time of outage
June 29, 2020 13:20 JST (GMT+9) - July 14, 2020 17:42 JST (GMT+9)
# Cause of the outage
Due to the detection of unauthorized communications in our network, we've blocked some communications as a preventive measure.
During the date and time stated above, webhook events couldn't be sent to some bot servers (Webhook URLs) using ngrok.
We will continue to improve the quality of the services we provide to our developers and we greatly appreciate your understanding.