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.