Sublime SFTP times out with known working config

I have a working config for my sublime SFTP on sublime 3 which I have running on a Windows device.

I've tried to set up the same exact configuration on my mac device and I get a timeout error.

The mac device can access command line sftp and filezilla just fine, but sublime sftp won't work.

Here's my config file.

    {
    "type": "sftp",
    "sync_down_on_open": true,
    "upload_on_save":true,
    "host": "xx.xxx.xx.xx",
    "user": "ubuntu",
    "remote_path": "/var/www",
    "connect_timeout": 120,
    "keepalive": 120,
    "ssh_key_file": "/Users/Username/.ssh/File.ppk"


}

All I get in response is

Connecting to SFTP server "xx.xxx.xx.xx" as "ubuntu" ..... failure (Connection timeout)

I've also tried with the aws public dns but that doesn't work either.

Any help would be really appreciated.. I've been fighting with this for hours.