diff --git a/telethon/network/mtproto_plain_sender.py b/telethon/network/mtproto_plain_sender.py
index 57d7a60e..1fa1fbc1 100755
--- a/telethon/network/mtproto_plain_sender.py
+++ b/telethon/network/mtproto_plain_sender.py
@@ -12,6 +12,7 @@ class MtProtoPlainSender:
         self._time_offset = 0
         self._last_msg_id = 0
         self._transport = transport
+        self._transport.connect()
 
     def send(self, data):
         """Sends a plain packet (auth_key_id = 0) containing the given message body (data)"""
diff --git a/telethon/network/tcp_client.py b/telethon/network/tcp_client.py
index 2bc9fc9d..29618cbd 100755
--- a/telethon/network/tcp_client.py
+++ b/telethon/network/tcp_client.py
@@ -31,13 +31,15 @@ class TcpClient:
 
     def connect(self, ip, port):
         """Connects to the specified IP and port number"""
-        self.socket.connect((ip, port))
-        self.connected = True
+        if not self.connected:
+            self.socket.connect((ip, port))
+            self.connected = True
 
     def close(self):
         """Closes the connection"""
-        self.socket.close()
-        self.connected = False
+        if self.connected:
+            self.socket.close()
+            self.connected = False
 
     def write(self, data):
         """Writes (sends) the specified bytes to the connected peer"""