Homebrew is already installed

Simply select "n" (no) to refuse installing Homebrew when prompted. This is because Homebrew is already installed on all Managed Servers so you do not need to install it again. 

After selecting "n" to reject the Homebrew installation, "remotebuild" should start properly on default port 3000. You may also start "remotebuild" on other ports such as 3001, 3002 etc. using:

remotebuild --port [alternative port number]