diff --git a/IM/__init__.py b/IM/__init__.py
index e27452c8d..855049617 100644
--- a/IM/__init__.py
+++ b/IM/__init__.py
@@ -19,5 +19,5 @@
            'InfrastructureInfo', 'InfrastructureManager', 'recipe', 'request', 'REST', 'retry',
            'ServiceRequests', 'SSH', 'SSHRetry', 'timedcall', 'UnixHTTPAdapter', 'uriparse',
            'VirtualMachine', 'VMRC', 'xmlobject']
-__version__ = '1.6.5'
+__version__ = '1.6.6'
 __author__ = 'Miguel Caballer'
diff --git a/IM/auth.py b/IM/auth.py
index b69130262..ca5a4a644 100644
--- a/IM/auth.py
+++ b/IM/auth.py
@@ -71,7 +71,7 @@ def getAuthInfoByID(self, auth_id):
         """
         res = []
         for auth in self.auth_list:
-            if auth['id'] == auth_id:
+            if 'id' in auth and auth['id'] == auth_id:
                 res.append(auth)
         return res
 
@@ -114,22 +114,49 @@ def compare(self, other_auth, auth_type):
 
         return True
 
+    @staticmethod
+    def split_line(line):
+        """
+        Split line using ; as separator char
+        considering single quotes as a way to delimit
+        tokens. (in particular to enable using char ; inside a token)
+        """
+        tokens = []
+        token = ""
+        in_qoutes = False
+        in_dqoutes = False
+        for char in line:
+            if char == '"' and not in_qoutes:
+                in_dqoutes = not in_dqoutes
+            elif char == "'" and not in_dqoutes:
+                in_qoutes = not in_qoutes
+            elif char == ";" and not in_qoutes and not in_dqoutes:
+                tokens.append(token)
+                token = ""
+            else:
+                token += char
+        # Add the last token
+        if token.strip() != "":
+            tokens.append(token)
+
+        return tokens
+
     @staticmethod
     def read_auth_data(filename):
         """
         Read a file to load the Authentication data.
         The file has the following format:
 
-        id = one; type = OpenNebula; host = osenserve:2633; username = user; password = pass
-        type = InfrastructureManager; username = user; password = pass
-        type = VMRC; host = http://server:8080/vmrc; username = user; password = pass
+        id = one; type = OpenNebula; host = oneserver:2633; username = user; password = pass
+        type = InfrastructureManager; username = user; password = 'pass;test'
+        type = VMRC; host = http://server:8080/vmrc; username = user; password = "pass';test"
         id = ec2; type = EC2; username = ACCESS_KEY; password = SECRET_KEY
         id = oshost; type = OpenStack; host = oshost:8773; username = ACCESS_KEY; key = SECRET_KEY
         id = occi; type = OCCI; host = occiserver:4567; username = user; password = file(/tmp/filename)
         id = occi; type = OCCI; proxy = file(/tmp/proxy.pem)
 
         Arguments:
-           - filename(str): The filename to read
+           - filename(str or list): The filename to read or list of auth lines
 
         Returns: a list with all the auth data
         """
@@ -146,7 +173,7 @@ def read_auth_data(filename):
             line = line.strip()
             if len(line) > 0 and not line.startswith("#"):
                 auth = {}
-                tokens = line.split(";")
+                tokens = Authentication.split_line(line)
                 for token in tokens:
                     key_value = token.split(" = ")
                     if len(key_value) != 2:
diff --git a/changelog b/changelog
index 9efe44bad..4a2626682 100644
--- a/changelog
+++ b/changelog
@@ -362,3 +362,10 @@ IM 1.6.5
     * Homogenize Inf ID log message
     * Fix error cpu.count parameter is ignored in OpenStack conn.
     * Fix ansible_version is not available in ctxt process.
+
+IM 1.6.6
+    * Fix authorization file format does not allow passwords that contain ";".
+    * Improve error message in ONE conn in case net without leases.
+    * Fix error using disks.free_size in connectors.
+    * Add retries in Azure RG deletion.
+    * Avoid raising error in case that one auth line does not have the type field.
\ No newline at end of file
diff --git a/doc/source/client.rst b/doc/source/client.rst
index 209aea49c..572336524 100644
--- a/doc/source/client.rst
+++ b/doc/source/client.rst
@@ -130,8 +130,14 @@ this::
 
    id = id_value ; type = value_of_type ; username = value_of_username ; password = value_of_password 
 
-Values can contain "=", and "\\n" is replaced by carriage return. The available
-keys are:
+Values can contain "=", and "\\n" is replaced by carriage return. 
+You can also delimit the values using single or double quotes (e.g. if a semicolon or some quote character
+ appear in a value)(from version 1.6.6)::
+
+   id = id_value ; type = value_of_type ; username = value_of_username ; password = 'some;"password'
+   id = id_value ; type = value_of_type ; username = value_of_username ; password = "some;'password"
+
+The available keys are:
 
 * ``type`` indicates the service that refers the credential. The services
   supported are ``InfrastructureManager``, ``VMRC``, ``OpenNebula``, ``EC2``,, ``FogBow``, 
diff --git a/docker-devel/Dockerfile b/docker-devel/Dockerfile
index 7bdc2ce0f..713fe1704 100644
--- a/docker-devel/Dockerfile
+++ b/docker-devel/Dockerfile
@@ -2,7 +2,7 @@
 FROM grycap/jenkins:ubuntu16.04-im
 ARG BRANCH=devel
 MAINTAINER Miguel Caballer <micafer1@upv.es>
-LABEL version="1.6.5"
+LABEL version="1.6.6"
 LABEL description="Container image to run the IM service. (http://www.grycap.upv.es/im)"
 
 EXPOSE 8899 8800
diff --git a/docker/Dockerfile b/docker/Dockerfile
index d60e2b88d..730438b79 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,7 +1,7 @@
 # Dockerfile to create a container with the IM service
 FROM ubuntu:16.04
 LABEL maintainer="Miguel Caballer <micafer1@upv.es>"
-LABEL version="1.6.5"
+LABEL version="1.6.6"
 LABEL description="Container image to run the IM service. (http://www.grycap.upv.es/im)"
 EXPOSE 8899 8800
 
@@ -18,7 +18,7 @@ RUN pip install msrest msrestazure azure-common azure-mgmt-storage azure-mgmt-co
 RUN apt-get update && apt-get install --no-install-recommends -y gcc libmysqld-dev libssl-dev libffi-dev libsqlite3-dev && \
      pip install MySQL-python && \
      pip install xmltodict && \
-     pip install IM==1.6.5 && \
+     pip install IM==1.6.6 && \
      apt-get remove -y gcc libmysqld-dev libssl-dev libffi-dev libsqlite3-dev python-dev python-pip && \
      apt-get autoremove -y && \
      rm -rf /var/lib/apt/lists/*
diff --git a/test/files/auth.dat b/test/files/auth.dat
new file mode 100644
index 000000000..c01cdf2f5
--- /dev/null
+++ b/test/files/auth.dat
@@ -0,0 +1,4 @@
+type = InfrastructureManager; username = someurser; password = somepass
+type = VMRC; host = http://server:8080/vmrc/vmrc; username = user; password = pass
+id = one2; type = OpenNebula; host = server1.com:2633; username = user; password = pass
+id = occi; type = OCCI; proxy = file(/tmp/privatekey.pem); host = https://server.com:11443
\ No newline at end of file
diff --git a/test/unit/auth.py b/test/unit/auth.py
new file mode 100755
index 000000000..b72cdbd91
--- /dev/null
+++ b/test/unit/auth.py
@@ -0,0 +1,67 @@
+#! /usr/bin/env python
+#
+# IM - Infrastructure Manager
+# Copyright (C) 2011 - GRyCAP - Universitat Politecnica de Valencia
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import unittest
+import os
+import shutil
+
+from IM.auth import Authentication
+
+
+class TestAuth(unittest.TestCase):
+    """
+    Class to test the Authentication class
+    """
+
+    def test_auth_read(self):
+        auth_lines = ["""id = 1; type = InfrastructureManager; username = someuser; password = somepass """,
+                      """id = 2; type = VMRC; username = someuser; password = somepass; """,
+                      """id = 3; type = OpenNebula; username = someuser; password = "some;'pass" """,
+                      """id = 4; type = EC2; username = someuser; password = 'some;"pass' """]
+        auth = Authentication.read_auth_data(auth_lines)
+        self.assertEqual(auth, [{'id': '1', 'password': "somepass",
+                                 'type': 'InfrastructureManager', 'username': 'someuser'},
+                                {'id': '2', 'password': "somepass",
+                                 'type': 'VMRC', 'username': 'someuser'},
+                                {'id': '3', 'password': "some;'pass",
+                                 'type': 'OpenNebula', 'username': 'someuser'},
+                                {'id': '4', 'password': 'some;"pass',
+                                 'type': 'EC2', 'username': 'someuser'}])
+
+        tests_path = os.path.dirname(os.path.abspath(__file__))
+        shutil.copyfile(os.path.join(tests_path, "../files/privatekey.pem"), "/tmp/privatekey.pem")
+        auth = Authentication(Authentication.read_auth_data(os.path.join(tests_path, "../files/auth.dat")))
+        auth_data = auth.getAuthInfoByID("occi")
+        self.assertEqual(auth_data[0]['proxy'][:37], "-----BEGIN RSA PRIVATE KEY-----\nMIIEo")
+        os.unlink("/tmp/privatekey.pem")
+
+
+    def test_get_auth(self):
+        auth_lines = ["""id = 1; type = InfrastructureManager; username = someuser; password = somepass """,
+                      """id = 2; type = VMRC; username = someuser; password = somepass; """]
+        auth = Authentication(Authentication.read_auth_data(auth_lines))
+        auth_data = auth.getAuthInfoByID("1")
+        self.assertEqual(auth_data, [{'id': '1', 'password': "somepass",
+                                      'type': 'InfrastructureManager', 'username': 'someuser'}])
+        auth_data = auth.getAuthInfo("VMRC")
+        self.assertEqual(auth_data, [{'id': '2', 'password': "somepass",
+                                      'type': 'VMRC', 'username': 'someuser'}])
+
+
+if __name__ == '__main__':
+    unittest.main()