diff --git a/plugins/synced_folders/smb/errors.rb b/plugins/synced_folders/smb/errors.rb
index f660b46e5..14704b9bb 100644
--- a/plugins/synced_folders/smb/errors.rb
+++ b/plugins/synced_folders/smb/errors.rb
@@ -6,6 +6,10 @@ module VagrantPlugins
         error_namespace("vagrant_sf_smb.errors")
       end
 
+      class SMBNotSupported < SMBError
+        error_key(:not_supported)
+      end
+
       class DefineShareFailed < SMBError
         error_key(:define_share_failed)
       end
diff --git a/plugins/synced_folders/smb/synced_folder.rb b/plugins/synced_folders/smb/synced_folder.rb
index dcbb903c6..29a60982a 100644
--- a/plugins/synced_folders/smb/synced_folder.rb
+++ b/plugins/synced_folders/smb/synced_folder.rb
@@ -6,6 +6,8 @@ require "log4r"
 require "vagrant/util/platform"
 require "vagrant/util/powershell"
 
+require_relative "errors"
+
 module VagrantPlugins
   module SyncedFolderSMB
     class SyncedFolder < Vagrant.plugin("2", :synced_folder)
@@ -13,7 +15,6 @@ module VagrantPlugins
         super
 
         @logger = Log4r::Logger.new("vagrant::synced_folders::smb")
-        @creds  = {}
       end
 
       def usable?(machine, raise_error=false)
@@ -23,7 +24,7 @@ module VagrantPlugins
         return true if machine.env.host.capability?(:smb_installed) &&
           machine.env.host.capability(:smb_installed)
         return false if !raise_error
-        raise Vagrant::Errors::SMBNotSupported
+        raise Errors::SMBNotSupported
       end
 
       def prepare(machine, folders, opts)
@@ -53,13 +54,13 @@ module VagrantPlugins
           data[:smb_password] ||= smb_password
 
           # Register password as sensitive
-          Vagrant::Util::CredentialScrubber.sensitive(smb_password)
+          Vagrant::Util::CredentialScrubber.sensitive(data[:smb_password])
         end
 
         machine.env.host.capability(:smb_prepare, machine, folders, opts)
       end
 
-      def enable(machine, folders, nfsopts)
+      def enable(machine, folders, opts)
         machine.ui.output(I18n.t("vagrant_sf_smb.mounting"))
 
         # Make sure that this machine knows this dance
@@ -99,10 +100,7 @@ module VagrantPlugins
         ssh_info = machine.ssh_info
 
         folders.each do |id, data|
-          data = data.dup
           data[:smb_host] ||= host_ip
-          data[:smb_username] ||= @creds[:username]
-          data[:smb_password] ||= @creds[:password]
 
           # Default the owner/group of the folder to the SSH user
           data[:owner] ||= ssh_info[:username]
diff --git a/templates/locales/synced_folder_smb.yml b/templates/locales/synced_folder_smb.yml
index 736640054..65c82de35 100644
--- a/templates/locales/synced_folder_smb.yml
+++ b/templates/locales/synced_folder_smb.yml
@@ -1,5 +1,9 @@
 en:
   vagrant_sf_smb:
+    not_supported: |-
+      It appears your machine doesn't support SMB, or there is not an
+      adapter to enable SMB on this machine for Vagrant. Ensure SMB
+      host functionality is available on this machine and try again.
     mounting: |-
       Mounting SMB shared folders...
     mounting_single: |-