If you are having errors with TinyUmbrella on Mac OS X
Something is wrong:
You don’t have admin privileges or
You have something running on port 80 or
Your hosts file is not modifiable
Please check Anti-Virus software or shutdown Skype/Teamviewer/etc as these apps block access to port 80.
Try this method:
sudo java -jar umbrella.jar
The previous commands will run TinyUmbrella as root which is what the application is expecting.
Running the Umbrella.app by double-clicking it, or even via the Terminal with sudo open Umbrella.app, it will run the java app as the non-privileged user which is what is causing the error.