I'm trying to build a play-framework application behind a heavily firewalled corporate network. I use an Artifactory to supply all of the project dependencies - there's no other way of connecting to the outside world. I've actually just git-cloned the starter project from the Play documentation.
When I sbt build the first error I see is a failure to download a plugin from the private repo:
[warn] module not found: com.typesafe.play#sbt-plugin;2.5.10
[warn] ==== local: tried
[warn] ==== my-maven-proxy-releases: tried
[warn] ==== my-ivy-proxy-releases: tried
The plugin is available from the following Ivy repository: https://repo.scala-sbt.org/scalasbt/sbt-plugin-releases/
More generally, the page about proxy repositories in the SBT docs has some usefull information (including the above URL), although I don't think all of it is very clear.