Webhook Subscription Failing with InternalServerError

We are trying to integrate with Slack through subscription webhooks. We are seeing the following error in Diagnostics > Subscription logs everytime the subscription is firing:

Failed to send subscription webhook request.
The subscription webhook https://hooks.slack.com/services/T3X...Yck failed, with a status of InternalServerError.
Octopus.Shared.ControlledFailureException: The subscription webhook https://hooks.slack.com/services/T3X...Yck failed, with a status of InternalServerError.
at Octopus.Server.Schedules.EventNotifications.NotificationCreator.d__12.MoveNext() in Z:\buildAgent\workDir\eec88466c176b607\source\Octopus.Server\Schedules\EventNotifications\NotificationCreator.cs:line 261

The error message appears to just indicate ‘InternalServerError’. What could cause this? We are currently on Octopus version 3.11.0

Thanks!

Hi Clayton,

Thanks for getting in touch! After some testing, I was able to replicate exactly as you see while Slack webhooks in your Subscription. I have opened up the following issue on Github which you can follow:

Our suggested approach currently is to use Zapier for your webhooks and send Slack notifications from. You can check out our blog post which walks through configuring Subscriptions this way :slight_smile:

Sorry it’s not better news!

Best regards,

Kenny