diff --git a/fritzbox_cpu_temperature.py b/fritzbox_cpu_temperature.py
index d38015a..e22423a 100755
--- a/fritzbox_cpu_temperature.py
+++ b/fritzbox_cpu_temperature.py
@@ -10,6 +10,7 @@
   [fritzbox_*]
   env.fritzbox_ip [ip address of the fritzbox]
   env.fritzbox_password [fritzbox password]
+  env.fritzbox_username [optional: fritzbox username]
   
   This plugin supports the following munin configuration parameters:
   #%# family=auto contrib
@@ -29,7 +30,11 @@ def get_cpu_temperature():
     server = os.environ['fritzbox_ip']
     password = os.environ['fritzbox_password']
 
-    session_id = fh.get_session_id(server, password)
+    if "fritzbox_username" in os.environ:
+        fritzuser = os.environ['fritzbox_username']
+        session_id = fh.get_session_id(server, password, fritzuser)
+    else:
+        session_id = fh.get_session_id(server, password)
     xhr_data = fh.get_xhr_content(server, session_id, PAGE)
     data = json.loads(xhr_data)
     print('temp.value %d' % (int(data['data']['cputemp']['series'][0][-1])))
diff --git a/fritzbox_cpu_usage.py b/fritzbox_cpu_usage.py
index 4f56321..bca1cd8 100755
--- a/fritzbox_cpu_usage.py
+++ b/fritzbox_cpu_usage.py
@@ -10,6 +10,7 @@
   [fritzbox_*]
   env.fritzbox_ip [ip address of the fritzbox]
   env.fritzbox_password [fritzbox password]
+  env.fritzbox_username [optional: fritzbox username]
   
   This plugin supports the following munin configuration parameters:
   #%# family=auto contrib
@@ -29,7 +30,11 @@ def get_cpu_usage():
     server = os.environ['fritzbox_ip']
     password = os.environ['fritzbox_password']
 
-    session_id = fh.get_session_id(server, password)
+    if "fritzbox_username" in os.environ:
+        fritzuser = os.environ['fritzbox_username']
+        session_id = fh.get_session_id(server, password, fritzuser)
+    else:
+        session_id = fh.get_session_id(server, password)
     xhr_data = fh.get_xhr_content(server, session_id, PAGE)
     data = json.loads(xhr_data)
     print('cpu.value %d' % (int(data['data']['cpuutil']['series'][0][-1])))
diff --git a/fritzbox_helper.py b/fritzbox_helper.py
index 7c9fcd3..92a41c4 100755
--- a/fritzbox_helper.py
+++ b/fritzbox_helper.py
@@ -10,6 +10,7 @@
   [fritzbox_*]
   env.fritzbox_ip [ip address of the fritzbox]
   env.fritzbox_password [fritzbox password]
+  env.fritzbox_username [optional: fritzbox username]
   
   This plugin supports the following munin configuration parameters:
   #%# family=auto contrib
@@ -29,22 +30,25 @@ from lxml import etree
 USER_AGENT = "Mozilla/5.0 (Macintosh; Intel Mac OS X x.y; rv:10.0) Gecko/20100101 Firefox/10.0"
 
 
-def get_session_id(server, password, port=80):
+def get_session_id(server, password, username=None, port=80):
     """Obtains the session id after login into the Fritzbox.
     See https://avm.de/fileadmin/user_upload/Global/Service/Schnittstellen/AVM_Technical_Note_-_Session_ID.pdf
     for deteils (in German).
 
     :param server: the ip address of the Fritzbox
     :param password: the password to log into the Fritzbox webinterface
+    :param username: (optional) the username with which to log into the Fritzbox webinterface
     :param port: the port the Fritzbox webserver runs on
     :return: the session id
     """
 
+    userpar = '' if username is None else '?username={}'.format(username)
+
     headers = {"Accept": "application/xml",
                "Content-Type": "text/plain",
                "User-Agent": USER_AGENT}
 
-    url = 'http://{}:{}/login_sid.lua'.format(server, port)
+    url = 'http://{}:{}/login_sid.lua{}'.format(server, port, userpar)
     try:
         r = requests.get(url, headers=headers)
         r.raise_for_status()
@@ -67,7 +71,7 @@ def get_session_id(server, password, port=80):
                "Content-Type": "application/x-www-form-urlencoded",
                "User-Agent": USER_AGENT}
 
-    url = 'http://{}:{}/login_sid.lua?&response={}'.format(server, port, response_bf)
+    url = 'http://{}:{}/login_sid.lua?{}&response={}'.format(server, port, userpar[1:], response_bf)
     try:
         r = requests.get(url, headers=headers)
         r.raise_for_status()
diff --git a/fritzbox_memory_usage.py b/fritzbox_memory_usage.py
index a73d13b..0965d66 100755
--- a/fritzbox_memory_usage.py
+++ b/fritzbox_memory_usage.py
@@ -10,6 +10,7 @@
   [fritzbox_*]
   env.fritzbox_ip [ip address of the fritzbox]
   env.fritzbox_password [fritzbox password]
+  env.fritzbox_username [optional: fritzbox username]
   
   This plugin supports the following munin configuration parameters:
   #%# family=auto contrib
@@ -30,7 +31,11 @@ def get_memory_usage():
     server = os.environ['fritzbox_ip']
     password = os.environ['fritzbox_password']
 
-    session_id = fh.get_session_id(server, password)
+    if "fritzbox_username" in os.environ:
+        fritzuser = os.environ['fritzbox_username']
+        session_id = fh.get_session_id(server, password, fritzuser)
+    else:
+        session_id = fh.get_session_id(server, password)
     xhr_data = fh.get_xhr_content(server, session_id, PAGE)
     data = json.loads(xhr_data)
     for i, usage in enumerate(USAGE):
diff --git a/fritzbox_power_consumption.py b/fritzbox_power_consumption.py
index 9d71a76..a9ae572 100755
--- a/fritzbox_power_consumption.py
+++ b/fritzbox_power_consumption.py
@@ -11,6 +11,7 @@
   [fritzbox_*]
   env.fritzbox_ip [ip address of the fritzbox]
   env.fritzbox_password [fritzbox password]
+  env.fritzbox_username [optional: fritzbox username]
   
   This plugin supports the following munin configuration parameters:
   #%# family=auto contrib
@@ -32,7 +33,11 @@ def get_power_consumption():
     server = os.environ['fritzbox_ip']
     password = os.environ['fritzbox_password']
 
-    session_id = fh.get_session_id(server, password)
+    if "fritzbox_username" in os.environ:
+        fritzuser = os.environ['fritzbox_username']
+        session_id = fh.get_session_id(server, password, fritzuser)
+    else:
+        session_id = fh.get_session_id(server, password)
     xhr_data = fh.get_xhr_content(server, session_id, PAGE)
     data = json.loads(xhr_data)
     devices = data['data']['drain']
diff --git a/fritzbox_uptime.py b/fritzbox_uptime.py
index 649c0d0..e0f5e7c 100755
--- a/fritzbox_uptime.py
+++ b/fritzbox_uptime.py
@@ -10,6 +10,7 @@
   [fritzbox_*]
   env.fritzbox_ip [ip address of the fritzbox]
   env.fritzbox_password [fritzbox password]
+  env.fritzbox_username [optional: fritzbox username]
 
   This plugin supports the following munin configuration parameters:
   #%# family=auto contrib
@@ -39,7 +40,11 @@ def get_uptime():
     server = os.environ['fritzbox_ip']
     password = os.environ['fritzbox_password']
 
-    session_id = fh.get_session_id(server, password)
+    if "fritzbox_username" in os.environ:
+        fritzuser = os.environ['fritzbox_username']
+        session_id = fh.get_session_id(server, password, fritzuser)
+    else:
+        session_id = fh.get_session_id(server, password)
     xhr_data = fh.get_xhr_content(server, session_id, PAGE)
     data = json.loads(xhr_data)
     for d in data['data']['drain']:
diff --git a/fritzbox_wifi_devices.py b/fritzbox_wifi_devices.py
index bc8e24c..b3a087c 100755
--- a/fritzbox_wifi_devices.py
+++ b/fritzbox_wifi_devices.py
@@ -10,6 +10,7 @@
   [fritzbox_*]
   env.fritzbox_ip [ip address of the fritzbox]
   env.fritzbox_password [fritzbox password]
+  env.fritzbox_username [optional: fritzbox username]
   
   This plugin supports the following munin configuration parameters:
   #%# family=auto contrib
@@ -36,7 +37,11 @@ def get_connected_wifi_devices():
     server = os.environ['fritzbox_ip']
     password = os.environ['fritzbox_password']
 
-    session_id = fh.get_session_id(server, password)
+    if "fritzbox_username" in os.environ:
+        fritzuser = os.environ['fritzbox_username']
+        session_id = fh.get_session_id(server, password, fritzuser)
+    else:
+        session_id = fh.get_session_id(server, password)
     xhr_data = fh.get_xhr_content(server, session_id, PAGE)
     data = json.loads(xhr_data)
     m = re.search(pattern, data['data']['drain'][2]['statuses'][-1])