Thanks, that makes sense. In Windows Defender Firewall, I tried opening ports 10500, 10501 and 8086 as described in this page: https://plasticscmsupport.zendesk.com/hc/en-us/articles/360012428753-Can-t-reach-the-Plastic-SCM-Cloud-server
Unfortunately I'm still seeing the same error message. Are there any ports I should be aware of? These are for TCP, right?