By June 30, 2017, JFrog Artifactory Cloud will use a new domain: jfrog.io, and the artifactoryonline.com domain will be deprecated. To continue accessing your server, you need to update the URL accordingly. For example if your server name is X and you used to access your server through X.artifactoryonline.com, then after the change, the entry point to your server will be X.jfrog.io.
Any attempts to access the old domain will be automatically redirected to www.jfrog.com. All builds that point to this domain will fail since the artifacts will not be found and the response returned to the build server will be an HTML page instead of the JSON object that the build info library expects.
Whitelist for Atelier.
This might be help if (like me) you work at a hospital with very strict network security. Without whitelisting these domains for my team, the proxy (Trend) detects the JVM binaries and automatically blocks traffic.
The kind staff at the WRC helped me with this question. (WRC staff are amazing)
FYI We've updated the product to automatically point to jfrog.io rather than artifactoryonline.com - see our announcement here.