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Also know, what protocol does slack use?
Slack added two-factor authentication to their service in response to the attacks. Slack was previously compatible with non-proprietary Internet Relay Chat (IRC) and XMPP messaging protocols, but the company closed the corresponding gateways in May 2018.
Regarding this, why is slack not connecting?
The most common cause of Slack connection issues is actually the network you're connected to. When you have a slow or unreliable Internet connection, your Slack isn't able to work properly. Sometimes, you may not even realize that you have a Slack connection problem until you try and use the service.
Slack adds offline mode, performance boosts and more. This means messages in the app will now load up faster when Slack is launched on an iOS device, and they'll also remain available even when users are offline.