Welcome to the Treehouse Community
Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.
Looking to learn something new?
Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.
Start your free trial
Andrew Luu
2,924 PointsHow do I change forwarding ports and fix port collisions (error occurs when I try to "Vagrant Up")?
In the "Installing the Treehouse VM on Windows" tutorial, I'm on the step where I've inputted "vagrant up" into CMDER. It's giving me an error saying: "Vagrant cannot forward the specified ports on this VM, since they would collide with some other application that is already listening on these ports. The forwarded port to 3000 is already in use on the host machine. To fix this, modify your current projects Vagrantfile to use another port. Example, where '1234' would be replaced by a unique host port:
config.vm.network :forwarded_port, guest: 3000, host:1234
Sometimes, Vagrant will attempt to auto-correct this for you. In this case, Vagrant was unable to. This is usually because the guest machine is in a state which doesn't allow modifying port forwarding."
So I'm in my Vagrantfile right now...my question is...what should my guest and host numbers be? In other words, how do I find which guest and host ports are available to use? If I change those numbers in the "Vagrantfile", I'd also have to change the "localhost:[insert which ever guest port number I end up choosing]", correct?