Image Artist: ImA Loader connection error when attempting to upload or download data

When attempting to download (or upload) data via the ImA Loader, the following error can be seen in the ImA Loader log:

"Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(<urllib3.connection.HTTPSConnection object at 0x000001C7D6909CD0>, 'Connection to ima_host timed out. (connect timeout=None)')'

Where ima_host is either the hostname or IP address of the ImA server.

Check to make sure that the appropriate firewall rules and exceptions have been made. In ImA 1.3 or above it is a requirement for the firewall between client computers and the Image Artist server to allow TCP traffic on port 9500 (assuming ImA is NOT using S3 storage, where this isn't a requirement).