I encountered this issue as well when using the wireless adapter.  I switched to direct cable network connection to the router/switch but the issue persisted.  I was able to identify that the security settings on the studio firfewall were preventing a successful connection to the Eventide server.  I moved the H9000 IP address to the DMZ on the network router and voila it connected to the Eventide server with no error message.  I suppose there are possibly a few firewall ports that need to be allowed for successful connection of studio devices to outside servers.  If the list of ports/protocols that need to be enabled or open on the firewall (other tha standar 80/HTTP) were listed, one could update the security profile on the router to permit connectivity accordingly eliminating need for a DMZ port to be setup for th H9000.

Good idea – we should make a note of this in the manual.

The query to the web service to get the list of available releases and their metadata happens over https (port 443).  The retrieval of the actual system binary is plain http (port 80).  There aren't any other protocols used in the update process.