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This article is for IT or network administrators in charge of managing an organisation’s network. If you ever need a hand with troubleshooting connection issues, we're here to help.
Older versions of the Slack desktop app can result in connection issues and even broken features.
Make sure that the desktop app is up to date. If you have Slack deployed on multiple Windows machines across your org, you can have the app update automatically via MSI installer.
Slack must have a persistent connection between our messaging server and members’ apps or browsers. To do so, Slack uses WebSockets over port 443.
Proxies and firewalls can sometimes interrupt this connection. If someone using Slack can’t connect from a specific location, or if there’s a WebSocket failure in our Slack connection test, you’ll need to adjust your proxy or firewall to keep the connection to Slack open. Here’s how:
Visit https://my.slack.com/help/urls and add all specified URLs to your allowlist. If your environment requires access to multiple workspaces and/or orgs, visit that page from each workspace and/or org.
Check if your proxy is running SSL decryption. If it is, the proxy must either support WebSockets, or you’ll need to exempt the following domains: wss-primary.slack.com wss-backup.slack.com wss-mobile.slack.com
Network administrators can restrict access to specific Slack workspaces using proxy header injection on their network. The header injection solution has the same network requirements as above.
Network environment
Certain software, security settings and firewalls can interfere with Slack connections:
Great news! Our Help Center is available in multiple languages. Switch to EnglishBonne nouvelle ! Le centre d'assistance de Slack est désormais disponible dans plusieurs langues. Poursuivre en FrançaisGute Neuigkeiten! Unser Support-Center gibt es jetzt in mehreren Sprachen! Weiter auf DeutschSlack ヘルプセンターが複数言語で閲覧できるようになりました!日本語ページへ切り替え¡Buenas noticias! El centro de ayuda de Slack ya está disponible en varios idiomas. Continúa leyendo en español