DockForge is no longer available.

Due to excessive resource usage and repeated abuse of the VPS system, we’ve decided to shut DockForge down. A lot of VPS instances were being created without consideration for the resources they consumed, making it increasingly difficult to keep the service running reliably. At this point, I don’t think DockForge will be coming back. Thank you to everyone who used it, tested it, gave feedback, or supported the project along the way.
— Prince