title: Zabbix timing out when sending Slack notification, but alerts are still send
body: <p>I have a question regarding the Slack Webhooks for Zabbix. I've configured Zabbix to send Slack messages when a trigger of any kind is triggered. However the alerts are send, but zabbix does not recognize that the messages have been send, as seen in the pictures below:
  <a href="https://i.stack.imgur.com/HR2wT.png" rel="nofollow noreferrer">Slack Alerts</a>
  <a href="https://i.stack.imgur.com/zodhS.png" rel="nofollow noreferrer">Slack Problem</a></p>
  
  <p>The Error messages state: <code>Slack notification failed : Error: cannot get URL: Timeout was reached</code></p>
  
  <p>Resolved Message: <code>Slack notification failed : channel_not_found</code></p>
  
  <p>I've followed <a href="https://www.zabbix.com/integrations/slack" rel="nofollow noreferrer">this</a> tutorial for the Slack intergration.</p>
  
  <p>My configuration is as follows:
  <a href="https://i.stack.imgur.com/vekre.png" rel="nofollow noreferrer">Actions</a>,
  <a href="https://i.stack.imgur.com/XeYLb.png" rel="nofollow noreferrer">Zabbix Admin user Media</a></p>
  
  <p>on Zabbix 4.4.7</p>
  
  <p>Hopefully someone can help me with this!</p>