What to do if Slack couldn’t send your messages

Aleksandar Ognjanovic
by Aleksandar Ognjanovic
Troubleshooting Expert
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  • If you're looking for a reliable collaboration tool to boost your team's results, Slack is an excellent choice
  • Millions of messages are sent via Slack on a daily basis, helping teams exchange ideas and grow their projects
  • But what do you do when Slack fails to send your messages? Obviously, you try to fix the problem and this guide will help you do just that
  • This troubleshooting guide is part of our Slack hub. Visit it to become a proficient Slack user.
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Slack is, probably, the most popular team organization tool out there. The abundance of features and overall usability are providing users with a great workspace tool.

Albeit, the issues are rather scarce, users will run into a few of them from time to time. One distinct error we run into is the Slack couldn’t send this message error.

Obviously, it appears when a user tries to send a message and are met with a halt. We provided you with 5 possible solutions below. Consider trying them out and give us a shout in the comments if they helped you.

How to fix Slack messaging issues

  1. Check whether servers are up
  2. Check the internet connection
  3. Clear application cache and restart
  4. Allow Slack in Windows Firewall
  5. Reinstall the app

Solution 1 – Check whether servers are up

Even though our first focus is usually on the individual cases, a service like Slack occasionally has general issues, plaguing a multitude of users. To check whether this is the case and identify possible server issue, we need you to navigate to the Slack Status website. There, you can find whether the problem is on your side or something which bothers others, as well.

Navigate to Slack Status, here, to find out which is the case. The Messaging section should give you enough insight concerning the “Slack couldn’t send this message” error you’re getting.

Solution 2 – Check the internet connection

Making sure that you’re using a stable connection is another thing you’ll need to worry about. This, of course, is simple to determine and rather simple to troubleshoot in general. Moreover, the best way to start when it comes to Slack troubleshooting the official web-based connection-testing tool.

This tool checks your connection to Slack and provides you with valuable insight. Just sign in and run the test.

After you’ve got some grip on possible issues, you can try these steps to troubleshoot the connection:

  • Clear browser’s cache (for a web-based client).
  • Restart your router.
  • Try with the wired connection.
  • Disable VPN or Proxy temporarily.

— RELATED: How to edit, delete or archive a Slack channel – Slack Guides

Solution 3 – Clear application cache and restart

If we go beyond the usual connection issues, the next stop is the app itself. The pilled up cache might be the reason for all kinds of errors.

Now, we can’t say with certainty whether that’s the case with the “Slack couldn’t send this message” error, but it won’t cost you a thing to clear the cache from Slack.

Based on what app you’re using (standard or UWP version), you can reset cache by following these steps:

  1. Open Slack.
  2. Click on the hamburger menu in the top left corner and choose Help > Troubleshooting > Clear cache and Restart.clear cache and restart Slack troubleshooting
  3. You can repeat the action and clear app‘s data as well.

Slack UWP from Microsoft Store

  1. Open Start.
  2. Right-click on the Slack app and choose More > App settings from the contextual menu.
  3. Try firstly with the Repair and, if it doesn’t work, go for the Reset option.restart app cache slack windows 10 settings

Solution 4 – Allow Slack in Windows Firewall

In order for any and all connection-dependent apps to work successfully, you’ll need to allow them through the Windows Firewall. Slack is not an exception.

This is usually done automatically, as long as you install the client or the Microsoft Store app. However, it might change and we’ll need you to confirm Slack is able to communicate through Public and Private networks.

With that said, here’s how to check it and make necessary changes:

  1. In the Windows Search bar, type Firewall, and open Allow an app through Windows Firewall.
  2. Click ”Change settings”.
  3. Allow Slack to communicate freely by checking both boxes.
  4. Confirm changes and restart your PC.
  5. Start Slack and look for changes.

In addition, if you run third-party antimalware software with a built-in firewall, we suggest whitelisting Slack, as well.

Solution 5 – Reinstall the app

Finally, if the “Slack couldn’t send this message” error persists, you can try reinstalling the app. In addition, consider using alternatives for the time being, whether that’s a web-based app, UWP, or a standard desktop app.

With that said, we can conclude this article. Don’t forget to tell us in the comments section below about alternative solutions you’re aware of or post questions. We look forward to hearing from you.

FAQ: Learn more about Slack messages

  • Can Slack send text messages?

You can send text messages directly from Slack with the help of an app called Avochato. This app threads all your conversations making it really easy to keep track of all the messages you send and receive. To use Avochato, simply sign up, create your account and you’ll receive a unique phone number that you can use to make calls and send text messages.

  • How do I view messages on Slack?

To view messages on Slack, click on the channel name to enter the channel and read all the messages available there. There is also a blue bar that displays the number of new messages sent since you were last active on the respective channel.

  • Does Slack save deleted messages?

Slack can keep all the messages exchanged on channels as long as the respective workspace exists. However, there are particular settings that users can enable so as to set a time frame after which Slack is allowed to permanently delete messages.

  • Can Slack recover deleted messages?

Once a message has been deleted on Slack, it is gone forever and users cannot recover it. Deleted messages disappear completely from the platform and are not counted towards the free plan 10K messages limit.

Editor’s Note: This post was originally published in January 2019 and has been since updated for freshness and accuracy.