shows Slack on an Amazon IP. Same thing for signal.org so I'm guessing this is an Amazon reachability problem in Norway.
dig +short slack.com 184.108.40.206
* Users in Tokyo may experience disconnects, high latency, and other connectivity failures. Mar 5, 00:48 UTC
* The issue has been identified and a fix is being implemented. Mar 5, 00:57 UTC
* A fix has been implemented and we are monitoring the results. Mar 5, 01:02 UTC
* We are continuing to monitor for any further issues. Mar 5, 06:51 UTC