Please also see the commentherefrom GerhardAtSafe
FME Hub, or https://hub.safe.com, resolves to an AWS ELB (Amazon Web Services Elastic Load Balancer).This service uses multiple IP addresses.If you have strict firewall rules, you must whitelist this range.
There is a greatStack Exchange discussionon this topic and for more information about the IP range from Amazon, navigate tothis page.
*Note that as a workaround, you can download content directly fromFME Huband transfer it to any machine that you cannot modify firewall rules for!
Edit: Please also view thisKnowledge Center Q&A Discussion.
Keywords: fme hub firewall troubleshooting