You can add Slack to your trusted addresses. Then the traffic through port 443 will not be scanned only at this address.
'Settings->Network settings->Trusted addresses->Add'.
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This method is not working on me. My Slack connection still blocked. Disable checking on HTTPS > Port 443 seems the only way around.
Issues connecting with Slack (port 443 problems)
in Kaspersky Total Security
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This method is not working on me. My Slack connection still blocked. Disable checking on HTTPS > Port 443 seems the only way around.