"Connection Error: The service at localhost:9867" on Windows that's fixed by reboot

[philrz]

We've had reports of a couple instances of the symptom described at https://github.com/brimsec/brim/wiki/Troubleshooting#brim-shows-connection-error-the-service-at-localhost9867-could-not-be-reached from Windows users who said they ultimately were able to work around the problem by rebooting their system. The relevant threads from the public Slack:

• https://brimsec.slack.com/archives/CTT24051C/p1609262990051200
• https://brimsec.slack.com/archives/C010DR0HHMF/p1611750978020600
• https://brimsec.slack.com/archives/C010DR0HHMF/p1612883459034600
• https://brimsec.slack.com/archives/C010DR0HHMF/p1614435283009600

We've unfortunately been unable to reproduce this ourselves or study a system "live" while it's happening, so the root cause remains a mystery. I'm opening this issue so we have a place to point users to who experience the same symptom in hopes we can gather up enough detail to narrow down when/why it happens and eventually address the root cause.

[philrz]

Note this article is linked to from the Troubleshooting articles in the Brim wiki. If/when this issue is addressed, the article should be updated.