This probably doesn’t apply to most of you, but we found that one of our clients had a DLP software solution (Forcepoint / Websense) that was causing this problem. The DLP software didn’t report any blocks in the portal or anything inside of the UI. This was a known problem with a new version of this DLP software and they had a workaround on their support pages (whitelisting stuff like vpnkit-bridge, a docker path, etc.).
Again, this was probably a unique scenario but thought I would post it here as we were going a little crazy diagnosing this. In no particular order, here are a few things we did with their test PC (to no avail):
- Verified no outbound communication was happening to those IPs (network firewall)
- Uninstall AV & EPS
- Downgraded to older versions of Docker Desktop
- Uninstalled recent Windows Updates