vagrant ssh failure

Net::SSH::ConnectionTimeout>
DEBUG ssh: Checking whether SSH is ready...
 INFO machine: Calling action: read_ssh_info on provider AWS (i-00463878091d9b8b8)
 INFO interface: Machine: action ["read_ssh_info", "start", {:target=>:ctgawsvm}]
 INFO runner: Preparing hooks for middleware sequence...
 INFO runner: 1 hooks defined.
 INFO runner: Running action: machine_action_read_ssh_info #<Vagrant::Action::Builder:0x00000101bd3dd0>
 INFO warden: Calling IN action: #<Vagrant::Action::Builtin::ConfigValidate:0x00000101bcba40>
 INFO warden: Calling IN action: #<VagrantPlugins::AWS::Action::ConnectAWS:0x00000101bcb9f0>
 INFO connect_aws: Connecting to AWS...
 INFO warden: Calling IN action: #<VagrantPlugins::AWS::Action::ReadSSHInfo:0x00000101b90508>
 INFO warden: Calling OUT action: #<VagrantPlugins::AWS::Action::ReadSSHInfo:0x00000101b90508>
 INFO warden: Calling OUT action: #<VagrantPlugins::AWS::Action::ConnectAWS:0x00000101bcb9f0>
 INFO warden: Calling OUT action: #<Vagrant::Action::Builtin::ConfigValidate:0x00000101bcba40>
 INFO interface: Machine: action ["read_ssh_info", "end", {:target=>:ctgawsvm}]
DEBUG ssh: Checking key permissions: /Users/37332/.ssh/drupal-vm.pem
 INFO ssh: Attempting SSH connection...
 INFO ssh: Attempting to connect to SSH...
 INFO ssh:   - Host: ec2-52-72-154-143.compute-1.amazonaws.com
 INFO ssh:   - Port: 22
 INFO ssh:   - Username: drupal-vm
 INFO ssh:   - Password? false
 INFO ssh:   - Key Path: ["/Users/37332/.ssh/drupal-vm.pem"]
DEBUG ssh:   - connect_opts: {:auth_methods=>["none", "hostbased", "publickey"], :config=>false, :forward_agent=>true, :send_env=>false, :keys_only=>true, :paranoid=>false, :password=>nil, :port=>22, :timeout=>15, :user_known_hosts_file=>[], :verbose=>:debug, :logger=>#<Logger:0x000001078812d0 @progname=nil, @level=0, @default_formatter=#<Logger::Formatter:0x000001078812a8 @datetime_format=nil>, @formatter=nil, @logdev=#<Logger::LogDevice:0x00000107881208 @shift_size=nil, @shift_age=nil, @filename=nil, @dev=#<StringIO:0x00000107881320>, @mutex=#<Logger::LogDevice::LogDeviceMutex:0x000001078811e0 @mon_owner=nil, @mon_count=0, @mon_mutex=#<Mutex:0x00000107881168>>>>, :keys=>["/Users/37332/.ssh/drupal-vm.pem"]}
^C INFO interface: warn: Waiting for cleanup before exiting...
 INFO interface: warn: ==> ctgawsvm: Waiting for cleanup before exiting...
DEBUG ssh: == Net-SSH connection debug-level log START ==
DEBUG ssh: D, [2017-03-21T11:27:28.280861 #33274] DEBUG -- net.ssh.transport.session[83c3d90c]: establishing connection to ec2-52-72-154-143.compute-1.amazonaws.com:22

DEBUG ssh: == Net-SSH connection debug-level log END ==
 INFO ssh: SSH not up: #<Vagrant::Errors::NetSSHException: An error occurred in the underlying SSH library that Vagrant uses.
The error message is shown below. In many cases, errors from this
library are caused by ssh-agent issues. Try disabling your SSH
agent or removing some keys and try again.

If the problem persists, please report a bug to the net-ssh project.