diff --git a/mopidy/backends/spotify/session_manager.py b/mopidy/backends/spotify/session_manager.py
index 8f520896..3e8f1b67 100644
--- a/mopidy/backends/spotify/session_manager.py
+++ b/mopidy/backends/spotify/session_manager.py
@@ -33,9 +33,14 @@ class SpotifySessionManager(process.BaseThread, PyspotifySessionManager):
         self.cache_location = config['spotify']['cache_dir']
         self.settings_location = config['spotify']['cache_dir']
 
+        # Add proxy port only if available
+        full_proxy = config['proxy']['hostname']
+        if 'port' in config['proxy']:
+            full_proxy = full_proxy + ':' + str(config['proxy']['port'])
+
         PyspotifySessionManager.__init__(
             self, config['spotify']['username'], config['spotify']['password'],
-            proxy=config['proxy']['hostname'],
+            proxy=full_proxy,
             proxy_username=config['proxy']['username'],
             proxy_password=config['proxy']['password'])
 
diff --git a/mopidy/config/__init__.py b/mopidy/config/__init__.py
index e9ae7d86..7ccaa3f3 100644
--- a/mopidy/config/__init__.py
+++ b/mopidy/config/__init__.py
@@ -29,6 +29,7 @@ _proxy_schema = ConfigSchema('proxy')
 _proxy_schema['hostname'] = Hostname(optional=True)
 _proxy_schema['username'] = String(optional=True)
 _proxy_schema['password'] = Secret(optional=True)
+_proxy_schema['port'] = Port(optional=True)
 
 # NOTE: if multiple outputs ever comes something like LogLevelConfigSchema
 #_outputs_schema = config.AudioOutputConfigSchema()
diff --git a/mopidy/config/convert.py b/mopidy/config/convert.py
index 6cb20fcd..3c3edb85 100644
--- a/mopidy/config/convert.py
+++ b/mopidy/config/convert.py
@@ -39,6 +39,7 @@ def convert(settings):
     helper('audio/output', 'OUTPUT')
 
     helper('proxy/hostname', 'SPOTIFY_PROXY_HOST')
+    helper('proxy/port', 'SPOTIFY_PROXY_PORT')
     helper('proxy/username', 'SPOTIFY_PROXY_USERNAME')
     helper('proxy/password', 'SPOTIFY_PROXY_PASSWORD')
 
diff --git a/mopidy/config/default.conf b/mopidy/config/default.conf
index b525ef47..204c789b 100644
--- a/mopidy/config/default.conf
+++ b/mopidy/config/default.conf
@@ -16,3 +16,4 @@ output = autoaudiosink
 hostname =
 username =
 password =
+port =
\ No newline at end of file
diff --git a/mopidy/config/types.py b/mopidy/config/types.py
index ec0be1de..3dff0908 100644
--- a/mopidy/config/types.py
+++ b/mopidy/config/types.py
@@ -117,7 +117,10 @@ class Integer(ConfigValue):
         self._choices = choices
 
     def deserialize(self, value):
-        value = int(value)
+        try:
+            value = int(value)
+        except:
+            value = 0
         validators.validate_choice(value, self._choices)
         validators.validate_minimum(value, self._minimum)
         validators.validate_maximum(value, self._maximum)
@@ -222,7 +225,8 @@ class Port(Integer):
     allocate a port for us.
     """
     # TODO: consider probing if port is free or not?
-    def __init__(self, choices=None):
+    def __init__(self, choices=None, optional=False):
+        self._required = not optional        
         super(Port, self).__init__(
             minimum=0, maximum=2 ** 16 - 1, choices=choices)