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Slack is experiencing some connectivity issues — please stand by. Check
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:
Whitelist the following domains: *.slack.com *.slack-msgs.com *.slack-files.com *.slack-imgs.com *.slack-edge.com *.slack-core.com *.slack-redir.net slackb.com edgeapi.slack.com wss-primary.slack.com wss-backup.slack.com wss-mobile.slack.com app.slack.com a.slack-imgs.comb.slack-imgs.com
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: *.slack-msgs.com 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.
Additionally, network administrators can restrict access to a specific Slack workspace using exact URL whitelisting. To view a list of all URLs, visit https://my.slack.com/help/urls and whitelist any URLs you'd like.
Both of these solutions ensure full product functionality alongside controlled workspace access.
Certain software, security settings, and firewalls can interfere with Slack connections:
Avira Browser Safety
Spyware and adware
Visual Discovery by Superfish
Antivirus or ad-blocking software
Temporarily turning off your antivirus or ad-blocking software will let you troubleshoot your connection issue. If this fixes your issue, add *.slack-msgs.com wss-primary.slack.com wss-backup.slack.com wss-mobile.slack.com to your software’s exemption list before re-enabling.
Still having trouble? If you’re unable to resolve your connection issue, get in touch and include a Net Log if possible.