diff --git a/common/step_provision.go b/common/step_provision.go
index 888bea431..954544fed 100644
--- a/common/step_provision.go
+++ b/common/step_provision.go
@@ -63,6 +63,7 @@ func PopulateProvisionHookData(state multistep.StateBag) map[string]interface{}
 	hookData["ConnType"] = commConf.Type
 	hookData["SSHPublicKey"] = string(commConf.SSHPublicKey)
 	hookData["SSHPrivateKey"] = string(commConf.SSHPrivateKey)
+	hookData["SSHPrivateKeyFile"] = commConf.SSHPrivateKeyFile
 
 	// Backwards compatibility; in practice, WinRMPassword is fulfilled by
 	// Password.
diff --git a/provisioner/ansible/provisioner.go b/provisioner/ansible/provisioner.go
index 699790940..41cb51900 100644
--- a/provisioner/ansible/provisioner.go
+++ b/provisioner/ansible/provisioner.go
@@ -67,6 +67,9 @@ type Config struct {
 	GalaxyCommand        string   `mapstructure:"galaxy_command"`
 	GalaxyForceInstall   bool     `mapstructure:"galaxy_force_install"`
 	RolesPath            string   `mapstructure:"roles_path"`
+	//TODO: change default to false in v1.6.0.
+	UseProxy     config.Trilean `mapstructure:"use_proxy"`
+	userWasEmpty bool
 }
 
 type Provisioner struct {
@@ -76,6 +79,9 @@ type Provisioner struct {
 	ansibleVersion    string
 	ansibleMajVersion uint
 	generatedData     map[string]interface{}
+
+	setupAdapterFunc   func(ui packer.Ui, comm packer.Communicator) (string, error)
+	executeAnsibleFunc func(ui packer.Ui, comm packer.Communicator, privKeyFile string) error
 }
 
 func (p *Provisioner) ConfigSpec() hcldec.ObjectSpec { return p.config.FlatMapstructure().HCL2Spec() }
@@ -163,6 +169,7 @@ func (p *Provisioner) Prepare(raws ...interface{}) error {
 	}
 
 	if p.config.User == "" {
+		p.config.userWasEmpty = true
 		usr, err := user.Current()
 		if err != nil {
 			errs = packer.MultiErrorAppend(errs, err)
@@ -174,6 +181,16 @@ func (p *Provisioner) Prepare(raws ...interface{}) error {
 		errs = packer.MultiErrorAppend(errs, fmt.Errorf("user: could not determine current user from environment."))
 	}
 
+	// These fields exist so that we can replace the functions for testing
+	// logic inside of the Provision func; in actual use, these don't ever
+	// need to get set.
+	if p.setupAdapterFunc == nil {
+		p.setupAdapterFunc = p.setupAdapter
+	}
+	if p.executeAnsibleFunc == nil {
+		p.executeAnsibleFunc = p.executeAnsible
+	}
+
 	if errs != nil && len(errs.Errors) > 0 {
 		return errs
 	}
@@ -207,40 +224,17 @@ func (p *Provisioner) getVersion() error {
 	return nil
 }
 
-func (p *Provisioner) Provision(ctx context.Context, ui packer.Ui, comm packer.Communicator, generatedData map[string]interface{}) error {
-	ui.Say("Provisioning with Ansible...")
-	// Interpolate env vars to check for generated values like password and port
-	p.generatedData = generatedData
-	p.config.ctx.Data = generatedData
-	for i, envVar := range p.config.AnsibleEnvVars {
-		envVar, err := interpolate.Render(envVar, &p.config.ctx)
-		if err != nil {
-			return fmt.Errorf("Could not interpolate ansible env vars: %s", err)
-		}
-		p.config.AnsibleEnvVars[i] = envVar
-	}
-	// Interpolate extra vars to check for generated values like password and port
-	for i, arg := range p.config.ExtraArguments {
-		arg, err := interpolate.Render(arg, &p.config.ctx)
-		if err != nil {
-			return fmt.Errorf("Could not interpolate ansible env vars: %s", err)
-		}
-		p.config.ExtraArguments[i] = arg
-	}
+func (p *Provisioner) setupAdapter(ui packer.Ui, comm packer.Communicator) (string, error) {
+	ui.Message("Setting up proxy adapter for Ansible....")
 
 	k, err := newUserKey(p.config.SSHAuthorizedKeyFile)
 	if err != nil {
-		return err
+		return "", err
 	}
 
 	hostSigner, err := newSigner(p.config.SSHHostKeyFile)
 	if err != nil {
-		return fmt.Errorf("error creating host signer: %s", err)
-	}
-
-	// Remove the private key file
-	if len(k.privKeyFile) > 0 {
-		defer os.Remove(k.privKeyFile)
+		return "", fmt.Errorf("error creating host signer: %s", err)
 	}
 
 	keyChecker := ssh.CertChecker{
@@ -298,7 +292,7 @@ func (p *Provisioner) Provision(ctx context.Context, ui packer.Ui, comm packer.C
 	}()
 
 	if err != nil {
-		return err
+		return "", err
 	}
 
 	ui = &packer.SafeUi{
@@ -307,50 +301,155 @@ func (p *Provisioner) Provision(ctx context.Context, ui packer.Ui, comm packer.C
 	}
 	p.adapter = adapter.NewAdapter(p.done, localListener, config, p.config.SFTPCmd, ui, comm)
 
-	defer func() {
-		log.Print("shutting down the SSH proxy")
-		close(p.done)
-		p.adapter.Shutdown()
-	}()
+	return k.privKeyFile, nil
+}
 
-	go p.adapter.Serve()
+func (p *Provisioner) createInventoryFile(hostIP string, hostPort int) error {
+	log.Printf("Creating inventory file for Ansible run...")
+	tf, err := ioutil.TempFile(p.config.InventoryDirectory, "packer-provisioner-ansible")
+	if err != nil {
+		return fmt.Errorf("Error preparing inventory file: %s", err)
+	}
+	host := fmt.Sprintf("%s ansible_host=%s ansible_user=%s ansible_port=%d\n",
+		p.config.HostAlias, hostIP, p.config.User, hostPort)
+	if p.ansibleMajVersion < 2 {
+		host = fmt.Sprintf("%s ansible_ssh_host=%s ansible_ssh_user=%s ansible_ssh_port=%d\n",
+			p.config.HostAlias, hostIP, p.config.User, hostPort)
+	}
+
+	w := bufio.NewWriter(tf)
+	w.WriteString(host)
+
+	for _, group := range p.config.Groups {
+		fmt.Fprintf(w, "[%s]\n%s", group, host)
+	}
+
+	for _, group := range p.config.EmptyGroups {
+		fmt.Fprintf(w, "[%s]\n", group)
+	}
+
+	if err := w.Flush(); err != nil {
+		tf.Close()
+		os.Remove(tf.Name())
+		return fmt.Errorf("Error preparing inventory file: %s", err)
+	}
+	tf.Close()
+	p.config.InventoryFile = tf.Name()
+
+	return nil
+}
+
+func (p *Provisioner) Provision(ctx context.Context, ui packer.Ui, comm packer.Communicator, generatedData map[string]interface{}) error {
+	ui.Say("Provisioning with Ansible...")
+	// Interpolate env vars to check for generated values like password and port
+	p.generatedData = generatedData
+	p.config.ctx.Data = generatedData
+	for i, envVar := range p.config.AnsibleEnvVars {
+		envVar, err := interpolate.Render(envVar, &p.config.ctx)
+		if err != nil {
+			return fmt.Errorf("Could not interpolate ansible env vars: %s", err)
+		}
+		p.config.AnsibleEnvVars[i] = envVar
+	}
+	// Interpolate extra vars to check for generated values like password and port
+	for i, arg := range p.config.ExtraArguments {
+		arg, err := interpolate.Render(arg, &p.config.ctx)
+		if err != nil {
+			return fmt.Errorf("Could not interpolate ansible env vars: %s", err)
+		}
+		p.config.ExtraArguments[i] = arg
+	}
+
+	// Set up proxy if there's no host IP to access, regardless of user config.
+	hostIP := generatedData["Host"].(string)
+
+	if hostIP == "" && p.config.UseProxy.False() {
+		ui.Error("Warning: use_proxy is false, but instance does" +
+			" not have an IP address to give to Ansible. Falling back" +
+			" to use localhost proxy.")
+		p.config.UseProxy = config.TriTrue
+	}
+
+	privKeyFile := ""
+	if !p.config.UseProxy.False() {
+		// We set up the proxy if useProxy is either true or unset.
+		pkf, err := p.setupAdapterFunc(ui, comm)
+		if err != nil {
+			return err
+		}
+		// This is necessary to avoid accidentally redeclaring
+		// privKeyFile in the scope of this if statement.
+		privKeyFile = pkf
+
+		defer func() {
+			log.Print("shutting down the SSH proxy")
+			close(p.done)
+			p.adapter.Shutdown()
+		}()
+
+		go p.adapter.Serve()
+
+		// Remove the private key file
+		if len(privKeyFile) > 0 {
+			defer os.Remove(privKeyFile)
+		}
+	} else {
+		ui.Message("Not using Proxy adapter for Ansible run:\n" +
+			"\tUsing ssh keys from Packer communicator...")
+		// In this situation, we need to make sure we have the
+		// private key we actually use to access the instance.
+		SSHPrivateKeyFile := generatedData["SSHPrivateKeyFile"].(string)
+		if SSHPrivateKeyFile != "" {
+			privKeyFile = SSHPrivateKeyFile
+		} else {
+			// See if we can get a private key and write that to a tmpfile
+			SSHPrivateKey := generatedData["SSHPrivateKey"].([]byte)
+			tmpSSHPrivateKey, err := tmp.File("ansible-key")
+			if err != nil {
+				return fmt.Errorf("Error writing private key to temp file for"+
+					"ansible connection: %v", err)
+			}
+			_, err = tmpSSHPrivateKey.Write(SSHPrivateKey)
+			if err != nil {
+				return errors.New("failed to write private key to temp file")
+			}
+			err = tmpSSHPrivateKey.Close()
+			if err != nil {
+				return errors.New("failed to close private key temp file")
+			}
+			privKeyFile = tmpSSHPrivateKey.Name()
+		}
+
+		// Also make sure that the username matches the SSH keys given.
+		if p.config.userWasEmpty {
+			p.config.User = generatedData["User"].(string)
+		}
+	}
 
 	if len(p.config.InventoryFile) == 0 {
-		tf, err := ioutil.TempFile(p.config.InventoryDirectory, "packer-provisioner-ansible")
+		hostIP = "127.0.0.1"
+		hostPort := p.config.LocalPort
+		if p.config.UseProxy.False() {
+			// We aren't using a proxy, so we need to retrieve the
+			// host IP and port from generated data.
+			hostIP = generatedData["Host"].(string)
+			hostPort = int(generatedData["Port"].(int64))
+		}
+
+		// Create the inventory file
+		err := p.createInventoryFile(hostIP, hostPort)
 		if err != nil {
-			return fmt.Errorf("Error preparing inventory file: %s", err)
-		}
-		defer os.Remove(tf.Name())
-
-		host := fmt.Sprintf("%s ansible_host=127.0.0.1 ansible_user=%s ansible_port=%d\n",
-			p.config.HostAlias, p.config.User, p.config.LocalPort)
-		if p.ansibleMajVersion < 2 {
-			host = fmt.Sprintf("%s ansible_ssh_host=127.0.0.1 ansible_ssh_user=%s ansible_ssh_port=%d\n",
-				p.config.HostAlias, p.config.User, p.config.LocalPort)
+			return err
 		}
 
-		w := bufio.NewWriter(tf)
-		w.WriteString(host)
-		for _, group := range p.config.Groups {
-			fmt.Fprintf(w, "[%s]\n%s", group, host)
-		}
-
-		for _, group := range p.config.EmptyGroups {
-			fmt.Fprintf(w, "[%s]\n", group)
-		}
-
-		if err := w.Flush(); err != nil {
-			tf.Close()
-			return fmt.Errorf("Error preparing inventory file: %s", err)
-		}
-		tf.Close()
-		p.config.InventoryFile = tf.Name()
+		// Delete the generated inventory file
 		defer func() {
+			os.Remove(p.config.InventoryFile)
 			p.config.InventoryFile = ""
 		}()
 	}
 
-	if err := p.executeAnsible(ui, comm, k.privKeyFile); err != nil {
+	if err := p.executeAnsibleFunc(ui, comm, privKeyFile); err != nil {
 		return fmt.Errorf("Error executing Ansible: %s", err)
 	}
 
diff --git a/provisioner/ansible/provisioner.hcl2spec.go b/provisioner/ansible/provisioner.hcl2spec.go
index dbee849a1..e0b808af9 100644
--- a/provisioner/ansible/provisioner.hcl2spec.go
+++ b/provisioner/ansible/provisioner.hcl2spec.go
@@ -36,6 +36,7 @@ type FlatConfig struct {
 	GalaxyCommand        *string           `mapstructure:"galaxy_command" cty:"galaxy_command"`
 	GalaxyForceInstall   *bool             `mapstructure:"galaxy_force_install" cty:"galaxy_force_install"`
 	RolesPath            *string           `mapstructure:"roles_path" cty:"roles_path"`
+	UseProxy             *bool             `mapstructure:"use_proxy" cty:"use_proxy"`
 }
 
 // FlatMapstructure returns a new FlatConfig.
@@ -77,6 +78,7 @@ func (*FlatConfig) HCL2Spec() map[string]hcldec.Spec {
 		"galaxy_command":             &hcldec.AttrSpec{Name: "galaxy_command", Type: cty.String, Required: false},
 		"galaxy_force_install":       &hcldec.AttrSpec{Name: "galaxy_force_install", Type: cty.Bool, Required: false},
 		"roles_path":                 &hcldec.AttrSpec{Name: "roles_path", Type: cty.String, Required: false},
+		"use_proxy":                  &hcldec.AttrSpec{Name: "use_proxy", Type: cty.Bool, Required: false},
 	}
 	return s
 }
diff --git a/provisioner/ansible/provisioner_test.go b/provisioner/ansible/provisioner_test.go
index 39035d4ed..295e38699 100644
--- a/provisioner/ansible/provisioner_test.go
+++ b/provisioner/ansible/provisioner_test.go
@@ -14,9 +14,32 @@ import (
 	"strings"
 	"testing"
 
+	confighelper "github.com/hashicorp/packer/helper/config"
 	"github.com/hashicorp/packer/packer"
 )
 
+type provisionLogicTracker struct {
+	setupAdapterCalled   bool
+	executeAnsibleCalled bool
+	happyPath            bool
+}
+
+func (l *provisionLogicTracker) setupAdapter(ui packer.Ui, comm packer.Communicator) (string, error) {
+	l.setupAdapterCalled = true
+	if l.happyPath {
+		return "fakeKeyString", nil
+	}
+	return "", fmt.Errorf("chose sadpath")
+}
+
+func (l *provisionLogicTracker) executeAnsible(ui packer.Ui, comm packer.Communicator, privKeyFile string) error {
+	l.executeAnsibleCalled = true
+	if l.happyPath {
+		return fmt.Errorf("Chose sadpath")
+	}
+	return nil
+}
+
 // Be sure to remove the Ansible stub file in each test with:
 //   defer os.Remove(config["command"].(string))
 func testConfig(t *testing.T) map[string]interface{} {
@@ -354,3 +377,220 @@ func TestAnsibleLongMessages(t *testing.T) {
 		t.Fatalf("err: %s", err)
 	}
 }
+
+func TestCreateInventoryFile_vers1(t *testing.T) {
+	var p Provisioner
+	p.Prepare(testConfig(t))
+	defer os.Remove(p.config.Command)
+	p.ansibleMajVersion = 1
+	p.config.User = "testuser"
+
+	err := p.createInventoryFile("123.45.67.89", 2222)
+	if err != nil {
+		t.Fatalf("error creating config using localhost and local port proxy")
+	}
+	if p.config.InventoryFile == "" {
+		t.Fatalf("No inventory file was created")
+	}
+	defer os.Remove(p.config.InventoryFile)
+	f, err := ioutil.ReadFile(p.config.InventoryFile)
+	if err != nil {
+		t.Fatalf("couldn't read created inventoryfile: %s", err)
+	}
+
+	expected := "default ansible_ssh_host=123.45.67.89 ansible_ssh_user=testuser ansible_ssh_port=2222\n"
+	if fmt.Sprintf("%s", f) != expected {
+		t.Fatalf("File didn't match expected:\n\n expected: \n%s\n; recieved: \n%s\n", expected, f)
+	}
+}
+
+func TestCreateInventoryFile_vers2(t *testing.T) {
+	var p Provisioner
+	p.Prepare(testConfig(t))
+	defer os.Remove(p.config.Command)
+	p.ansibleMajVersion = 2
+	p.config.User = "testuser"
+
+	err := p.createInventoryFile("123.45.67.89", 1234)
+	if err != nil {
+		t.Fatalf("error creating config using localhost and local port proxy")
+	}
+	if p.config.InventoryFile == "" {
+		t.Fatalf("No inventory file was created")
+	}
+	defer os.Remove(p.config.InventoryFile)
+	f, err := ioutil.ReadFile(p.config.InventoryFile)
+	if err != nil {
+		t.Fatalf("couldn't read created inventoryfile: %s", err)
+	}
+	expected := "default ansible_host=123.45.67.89 ansible_user=testuser ansible_port=1234\n"
+	if fmt.Sprintf("%s", f) != expected {
+		t.Fatalf("File didn't match expected:\n\n expected: \n%s\n; recieved: \n%s\n", expected, f)
+	}
+}
+
+func TestCreateInventoryFile_Groups(t *testing.T) {
+	var p Provisioner
+	p.Prepare(testConfig(t))
+	defer os.Remove(p.config.Command)
+	p.ansibleMajVersion = 1
+	p.config.User = "testuser"
+	p.config.Groups = []string{"Group1", "Group2"}
+
+	err := p.createInventoryFile("123.45.67.89", 1234)
+	if err != nil {
+		t.Fatalf("error creating config using localhost and local port proxy")
+	}
+	if p.config.InventoryFile == "" {
+		t.Fatalf("No inventory file was created")
+	}
+	defer os.Remove(p.config.InventoryFile)
+	f, err := ioutil.ReadFile(p.config.InventoryFile)
+	if err != nil {
+		t.Fatalf("couldn't read created inventoryfile: %s", err)
+	}
+	expected := `default ansible_ssh_host=123.45.67.89 ansible_ssh_user=testuser ansible_ssh_port=1234
+[Group1]
+default ansible_ssh_host=123.45.67.89 ansible_ssh_user=testuser ansible_ssh_port=1234
+[Group2]
+default ansible_ssh_host=123.45.67.89 ansible_ssh_user=testuser ansible_ssh_port=1234
+`
+	if fmt.Sprintf("%s", f) != expected {
+		t.Fatalf("File didn't match expected:\n\n expected: \n%s\n; recieved: \n%s\n", expected, f)
+	}
+}
+
+func TestCreateInventoryFile_EmptyGroups(t *testing.T) {
+	var p Provisioner
+	p.Prepare(testConfig(t))
+	defer os.Remove(p.config.Command)
+	p.ansibleMajVersion = 1
+	p.config.User = "testuser"
+	p.config.EmptyGroups = []string{"Group1", "Group2"}
+
+	err := p.createInventoryFile("123.45.67.89", 1234)
+	if err != nil {
+		t.Fatalf("error creating config using localhost and local port proxy")
+	}
+	if p.config.InventoryFile == "" {
+		t.Fatalf("No inventory file was created")
+	}
+	defer os.Remove(p.config.InventoryFile)
+	f, err := ioutil.ReadFile(p.config.InventoryFile)
+	if err != nil {
+		t.Fatalf("couldn't read created inventoryfile: %s", err)
+	}
+	expected := `default ansible_ssh_host=123.45.67.89 ansible_ssh_user=testuser ansible_ssh_port=1234
+[Group1]
+[Group2]
+`
+	if fmt.Sprintf("%s", f) != expected {
+		t.Fatalf("File didn't match expected:\n\n expected: \n%s\n; recieved: \n%s\n", expected, f)
+	}
+}
+
+func TestCreateInventoryFile_GroupsAndEmptyGroups(t *testing.T) {
+	var p Provisioner
+	p.Prepare(testConfig(t))
+	defer os.Remove(p.config.Command)
+	p.ansibleMajVersion = 1
+	p.config.User = "testuser"
+	p.config.Groups = []string{"Group1", "Group2"}
+	p.config.EmptyGroups = []string{"Group3"}
+
+	err := p.createInventoryFile("123.45.67.89", 1234)
+	if err != nil {
+		t.Fatalf("error creating config using localhost and local port proxy")
+	}
+	if p.config.InventoryFile == "" {
+		t.Fatalf("No inventory file was created")
+	}
+	defer os.Remove(p.config.InventoryFile)
+	f, err := ioutil.ReadFile(p.config.InventoryFile)
+	if err != nil {
+		t.Fatalf("couldn't read created inventoryfile: %s", err)
+	}
+	expected := `default ansible_ssh_host=123.45.67.89 ansible_ssh_user=testuser ansible_ssh_port=1234
+[Group1]
+default ansible_ssh_host=123.45.67.89 ansible_ssh_user=testuser ansible_ssh_port=1234
+[Group2]
+default ansible_ssh_host=123.45.67.89 ansible_ssh_user=testuser ansible_ssh_port=1234
+[Group3]
+`
+	if fmt.Sprintf("%s", f) != expected {
+		t.Fatalf("File didn't match expected:\n\n file is \n\n %s", f)
+	}
+}
+
+func TestUseProxy(t *testing.T) {
+	type testcase struct {
+		UseProxy                   confighelper.Trilean
+		generatedData              map[string]interface{}
+		expectedSetupAdapterCalled bool
+		explanation                string
+	}
+
+	tcs := []testcase{
+		{
+			explanation: "use_proxy is true; we should set up adapter",
+			UseProxy:    confighelper.TriTrue,
+			generatedData: map[string]interface{}{
+				"Host": "123.45.67.8",
+				"Port": int64(1234),
+			},
+			expectedSetupAdapterCalled: true,
+		},
+		{
+			explanation: "use_proxy is false but no IP addr is available; we should set up adapter anyway.",
+			UseProxy:    confighelper.TriFalse,
+			generatedData: map[string]interface{}{
+				"Host": "",
+				"Port": nil,
+			},
+			expectedSetupAdapterCalled: true,
+		},
+		{
+			explanation: "use_proxy is false; we shouldn't set up adapter.",
+			UseProxy:    confighelper.TriFalse,
+			generatedData: map[string]interface{}{
+				"Host": "123.45.67.8",
+				"Port": int64(1234),
+			},
+			expectedSetupAdapterCalled: false,
+		},
+		{
+			explanation: "use_proxy is unset; we should default to setting up the adapter (for now).",
+			UseProxy:    confighelper.TriUnset,
+			generatedData: map[string]interface{}{
+				"Host": "123.45.67.8",
+				"Port": int64(1234),
+			},
+			expectedSetupAdapterCalled: true,
+		},
+	}
+
+	for _, tc := range tcs {
+		var p Provisioner
+		p.Prepare(testConfig(t))
+		p.config.UseProxy = tc.UseProxy
+		defer os.Remove(p.config.Command)
+		p.ansibleMajVersion = 1
+
+		var l provisionLogicTracker
+		l.setupAdapterCalled = false
+		p.setupAdapterFunc = l.setupAdapter
+		p.executeAnsibleFunc = l.executeAnsible
+		ctx := context.TODO()
+		comm := new(packer.MockCommunicator)
+		ui := &packer.BasicUi{
+			Reader: new(bytes.Buffer),
+			Writer: new(bytes.Buffer),
+		}
+		p.Provision(ctx, ui, comm, tc.generatedData)
+
+		if l.setupAdapterCalled != tc.expectedSetupAdapterCalled {
+			t.Fatalf("Should have called set up adapter: %s", tc.explanation)
+		}
+		os.Remove(p.config.Command)
+	}
+}
diff --git a/website/source/docs/provisioners/ansible.html.md.erb b/website/source/docs/provisioners/ansible.html.md.erb
index cd9179418..e8cde5d9c 100644
--- a/website/source/docs/provisioners/ansible.html.md.erb
+++ b/website/source/docs/provisioners/ansible.html.md.erb
@@ -183,6 +183,22 @@ Optional Parameters:
 -   `user` (string) - The `ansible_user` to use. Defaults to the user running
     packer.
 
+-   `use_proxy` (boolean) - Whether or not to set up a localhost proxy adapter
+    so that Ansible has an IP address to connect to, even if your guest does not
+    have an IP address. For example, the adapter is necessary for Docker builds
+    to use the Ansible provisioner. Defaults to "true". If you set this option
+    to `false`, but Packer cannot find an IP address to connect Ansible to, it
+    will automatically set up the adapter anyway.
+
+    In order for Ansible to connect properly even when use_proxy is false, you
+    need to make sure that you are either providing a valid username and ssh key
+    to the ansible provisioner directly, or that the username and ssh key
+    being used by the ssh communicator will work for your needs. If you do not
+    provide a user to ansible, it will use the user associated with your
+    builder, not the user running Packer.
+
+    use_proxy=false is currently only supported for SSH, not winRM.
+
 <%= partial "partials/provisioners/common-config" %>
 
 ## Default Extra Variables