Slack doesn’t connect to the Internet? We got fixes for it

Radu Tyrsina
by Radu Tyrsina
CEO & Founder
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Affiliate Disclosure

  • Slack is one of the best collaboration software on the market for both small and large teams.
  • To find out why Slack can’t connect to the Internet, check your Internet connection and run the Slack connection test.
  • To learn more about Slack, we suggest you check our out productivity software hub for more information.
  • For additional information regarding Slack issues, be sure to check out our Slack errors section for more detailed information.
slack won't connect to the Internet

Slack connection issues are impossible to avoid when you have a painfully slow or unreliable Internet connection.

There are times when Slack is actually down and connection problems originate from their servers, yet you might not like what you’re about to read.

The main reason for your Slack connection issues isn’t related to their infrastructure, but rather resides in your Internet connection.

Having to deal with unsent Slack messages or calls where the audio cuts in and out frequently is no scenario you want to be a part of for too long.

You don’t expect getting that from this popular messaging and collaboration app on a daily basis, yet this isn’t the time for losing patience.

In this article, we’re going to explore some of the best ways to fix Slack connection issues.

What can I do if Slack doesn’t connect to the Internet?

1. Check your Internet connection

Slack internet connection issues

  1. Open any other webpage.
  2. If that webpage doesn’t load either, reset your internet connection.
  3. Try loading Slack again.

This sounds rather basic, but in some instances your Internet connection can be the reason why Slack doesn’t connect to the Internet.


2. Run the Slack connection test

  1. Sign in to your Slack workspace.
  2. Access Slack testing page to check connections.
    Slack connection issues test
  3. Under the WebSockets section, see the results for both WebSocket (Flannel [Primary]) and WebSocket (Flannel [Backup]).
  4. A successful test will reveal the checked circle icon.
  5. A failed test will show instead the warning icon.
  6. In case of any errors, contact your network administrator or Internet service provider.

Having issues with Slack? You might want to consider using a different collaboration software


3. Clear your cache

  1. Open the Slack app.
  2. Click Help in your computer’s menu bar.
  3. Select Troubleshooting.
  4. Click Clear Cache and Restart.
    clear cache slack slack can't connect to the Internet

After clearing the cache, check if Slack still has problems connecting to the Internet.


4. Adjust your proxy to keep the connection to Slack open

  1. Visit Slack URL page.
    Slack connection issues sign in
  2. Here you must whitelist all specified URLs.
  3. Visit that page from each workspace if your environment requires access to multiple workspaces and/or orgs.
  4. Then, verify if your proxy is running SSL decryption.
  5. If it is, it’s time to exempt the following domains: *.slack-msgs.com wss-primary.slack.com wss-backup.slack.com wss-mobile.slack.com.

Always remember that proxies and firewalls often mess around with connection between Slack messaging servers and members’ apps.

This might be the case if there’s a WebSocket failure in our Slack connection test, or if it becomes impossible to connect from a specific location.


5. Collect and send Net Logs

  1. Open the Slack app.
  2. Click Help in your computer’s menu bar.
  3. Select Troubleshooting.
  4. Select the Restart and Collect Net Logs option.
  5. Once the app has restarted, reproduce the issue.
  6. Quit and restart Slack once more.
  7. It’s time to send Slack an email at feedback@slack.com with Net Log file or use the contact form.
    Slack connection issues contact

Note: The name of the file must start with net-log.

We hope this guide managed to help you fix the Slack connection issues caused by the Internet itself, antivirus software or security settings, disruptions with third-party services, or errors with app storage or Slack servers.

Do you know any alternative solutions? Just sound off in the comments below.

FAQ: Learn more about Slack

  • What is Slack used for?

Slack is used for instant communication, file sharing and collaboration between your team members.

  • Why is my Slack not connecting?

If Slack isn’t connecting, the most likely problem is your Internet connection. If your Internet connection is working, run Slack connectivity test and clear Slack cache.

  • Does Slack work without WiFi?

Slack is an online service, and it requires an active Internet connection, Wi-Fi or Ethernet, in order to work.

  • Why is Slack slow?

The most common cause of this problem is your Internet connection. If Slack is slow, make sure that you don’t have any downloads running in the background.

Editor’s Note: This post was originally published in December 2019 and has been since revamped and updated in March 2020 for freshness, accuracy, and comprehensiveness.