Fix None first_query and TcpClient.disconnect()

telethon/extensions/tcp_client.py

@@ -84,8 +84,9 @@ class TcpClient:
         """Closes the connection."""
         if self._socket is not None:
             try:
-                self._socket.shutdown(socket.SHUT_RDWR)
                 self._socket.close()
+            except OSError:
+                pass
             finally:
                 self._socket = None
 

telethon/network/mtprotosender.py

@@ -215,7 +215,7 @@ class MTProtoSender:
 
         __log__.debug('Connection success!')
         if self.state.auth_key is None:
-            self._is_first_query = True
+            self._is_first_query = bool(self._first_query)
             _last_error = SecurityError()
             plain = MTProtoPlainSender(self._connection)
             for retry in range(1, self._retries + 1):