diff --git a/monkey/infection_monkey/config.py b/monkey/infection_monkey/config.py
index 35bda0bd2..787c9e073 100644
--- a/monkey/infection_monkey/config.py
+++ b/monkey/infection_monkey/config.py
@@ -287,7 +287,7 @@ class Configuration(object):
         :param sensitive_data: the data to hash.
         :return: the hashed data.
         """
-        password_hashed = hashlib.sha512(sensitive_data).hexdigest()
+        password_hashed = hashlib.sha512(sensitive_data.encode()).hexdigest()
         return password_hashed
 
 
diff --git a/monkey/infection_monkey/exploit/vsftpd.py b/monkey/infection_monkey/exploit/vsftpd.py
index 744853bdf..136a8a36b 100644
--- a/monkey/infection_monkey/exploit/vsftpd.py
+++ b/monkey/infection_monkey/exploit/vsftpd.py
@@ -71,9 +71,9 @@ class VSFTPDExploiter(HostExploiter):
         if self.socket_connect(ftp_socket, self.host.ip_addr, FTP_PORT):
             ftp_socket.recv(RECV_128).decode('utf-8')
 
-        if self.socket_send_recv(ftp_socket, USERNAME + '\n'):
+        if self.socket_send_recv(ftp_socket, USERNAME + b'\n'):
             time.sleep(FTP_TIME_BUFFER)
-            self.socket_send(ftp_socket, PASSWORD + '\n')
+            self.socket_send(ftp_socket, PASSWORD + b'\n')
             ftp_socket.close()
             LOG.info('Backdoor Enabled, Now we can run commands')
         else:
diff --git a/monkey/infection_monkey/network/ping_scanner.py b/monkey/infection_monkey/network/ping_scanner.py
index 659722bc2..bf215168e 100644
--- a/monkey/infection_monkey/network/ping_scanner.py
+++ b/monkey/infection_monkey/network/ping_scanner.py
@@ -55,7 +55,8 @@ class PingScanner(HostScanner, HostFinger):
                                      PING_TIMEOUT_FLAG,
                                      str(timeout), host.ip_addr],
                                     stdout=subprocess.PIPE,
-                                    stderr=subprocess.PIPE)
+                                    stderr=subprocess.PIPE,
+                                    text=True)
 
         output = " ".join(sub_proc.communicate())
         regex_result = self._ttl_regex.search(output)
diff --git a/monkey/monkey_island/cc/services/node.py b/monkey/monkey_island/cc/services/node.py
index 6bff2b54a..3931ad009 100644
--- a/monkey/monkey_island/cc/services/node.py
+++ b/monkey/monkey_island/cc/services/node.py
@@ -52,7 +52,7 @@ class NodeService:
                 exploit["origin"] = NodeService.get_monkey_label(NodeService.get_monkey_by_id(edge["from"]))
                 exploits.append(exploit)
 
-        exploits.sort(key=NodeService._cmp_exploits_by_timestamp)
+        exploits = sorted(exploits, key=lambda exploit: exploit['timestamp'])
 
         new_node["exploits"] = exploits
         new_node["accessible_from_nodes"] = accessible_from_nodes
@@ -71,14 +71,6 @@ class NodeService:
             domain_name = " (" + node["domain_name"] + ")"
         return node["os"]["version"] + " : " + node["ip_addresses"][0] + domain_name
 
-    @staticmethod
-    def _cmp_exploits_by_timestamp(exploit_1, exploit_2):
-        if exploit_1["timestamp"] == exploit_2["timestamp"]:
-            return 0
-        if exploit_1["timestamp"] > exploit_2["timestamp"]:
-            return 1
-        return -1
-
     @staticmethod
     def get_monkey_os(monkey):
         os = "unknown"