diff --git a/roles/6-generic-apps/tasks/main.yml b/roles/6-generic-apps/tasks/main.yml
index 7e5bc884c..d1bdc56a1 100644
--- a/roles/6-generic-apps/tasks/main.yml
+++ b/roles/6-generic-apps/tasks/main.yml
@@ -31,6 +31,11 @@
     name: gitea
   when: gitea_install
 
+- name: JUPYTERHUB
+  include_role:
+    name: jupyterhub
+  when: jupyterhub_install
+
 - name: LOKOLE
   include_role:
     name: lokole
diff --git a/roles/jupyterhub/docs/README.md b/roles/jupyterhub/README.md
similarity index 52%
rename from roles/jupyterhub/docs/README.md
rename to roles/jupyterhub/README.md
index 9285bfa1b..92aa09749 100644
--- a/roles/jupyterhub/docs/README.md
+++ b/roles/jupyterhub/README.md
@@ -1,7 +1,8 @@
-### Jupyter Notebooks on Rpi Server
+### JupyterHub programming environment with student Notebooks
+
 * Jupyter Notebooks are widely used in the scientific community.
-* This IIAB package permits individal users to start using their own notebook on the server without needing an individual server account.
+* This IIAB package permits individual users to start using their own notebook on the server, without needing an individual server account.
 * Once a user signs in with a user name, and password, these credentials are stored, and are used thereafter to gain access to the user's files.
-* Individual folders are created for all student work in the path /var/lib/protected/. Individual students will only be able to see their own work in that directory.
+* Individual folders are created for all student work in the path /var/lib/protected/.  Individual students will only be able to see their own work in that directory.
 * Students will not have any privileges outside of their own folder.
-* They may upload jupyter notebooks from a local machine, and download the current state of their work via a normal browser download.
+* They may upload Jupyter Notebooks from a local machine, and download the current state of their work via a normal browser download.
diff --git a/roles/jupyterhub/tasks/main.yml b/roles/jupyterhub/tasks/main.yml
index 9090610a0..0ec1045ec 100644
--- a/roles/jupyterhub/tasks/main.yml
+++ b/roles/jupyterhub/tasks/main.yml
@@ -1,3 +1,24 @@
+# "How do i fail a task in Ansible if the variable contains a boolean value?
+# I want to perform input validation for Ansible playbooks"
+# https://stackoverflow.com/questions/46664127/how-do-i-fail-a-task-in-ansible-if-the-variable-contains-a-boolean-value-i-want/46667499#46667499
+
+# We assume 0-init/tasks/validate_vars.yml has DEFINITELY been run, so no need
+# to re-check whether vars are defined here.  As Ansible vars cannot be unset:
+# https://serverfault.com/questions/856729/how-to-destroy-delete-unset-a-variable-value-in-ansible
+
+- name: Assert that "jupyterhub_install is sameas true" (boolean not string etc)
+  assert:
+    that: jupyterhub_install is sameas true
+    fail_msg: "PLEASE SET 'jupyterhub_install: True' e.g. IN: /etc/iiab/local_vars.yml"
+    quiet: yes
+
+- name: Assert that "jupyterhub_enabled | type_debug == 'bool'" (boolean not string etc)
+  assert:
+    that: jupyterhub_enabled | type_debug == 'bool'
+    fail_msg: "PLEASE GIVE VARIABLE 'jupyterhub_enabled' A PROPER (UNQUOTED) ANSIBLE BOOLEAN VALUE e.g. IN: /etc/iiab/local_vars.yml"
+    quiet: yes
+
+
 - name: Install Jupyter if jupyterhub_installed not defined, e.g. in {{ iiab_state_file }}    # /etc/iiab/iiab_state.yml
   include_tasks: install.yml
   when: jupyterhub_installed is undefined
@@ -14,9 +35,9 @@
     value: "{{ item.value | string }}"
   with_items:
     - option: name
-      value: Jupyter
+      value: JupyterHub
     - option: description
-      value: '"Raspberry Pi Jupyter python programming environment"'
+      value: '"High Schools may want to consider JupyterHub to integrate coding with dynamic interactive graphing — A New Way to Think About Programming allowing students to integrate science experiments results and program output within their notebook/document/blog."'
     - option: install
       value: "{{ jupyterhub_install }}"
     - option: enabled
diff --git a/roles/network/templates/gateway/iiab-gen-iptables b/roles/network/templates/gateway/iiab-gen-iptables
index 95d9fea94..8380304fa 100755
--- a/roles/network/templates/gateway/iiab-gen-iptables
+++ b/roles/network/templates/gateway/iiab-gen-iptables
@@ -159,7 +159,7 @@ if [ "$wan" != "none" ]; then
 
         $IPTABLES -A INPUT -p tcp --dport $sugarizer_port -m state --state NEW -i $wan -j ACCEPT
         $IPTABLES -A INPUT -p tcp --dport $transmission_http_port -m state --state NEW -i $wan -j ACCEPT
-        $IPTABLES -A INPUT -p tcp --dport $transmission_http_port -m state --state NEW -i $wan -j ACCEPT
+        $IPTABLES -A INPUT -p tcp --dport $transmission_peer_port -m state --state NEW -i $wan -j ACCEPT
         $IPTABLES -A INPUT -p tcp --dport $jupyterhub_port -m state --state NEW -i $wan -j ACCEPT
     fi
 
diff --git a/vars/default_vars.yml b/vars/default_vars.yml
index 853afa608..87dfd0444 100644
--- a/vars/default_vars.yml
+++ b/vars/default_vars.yml
@@ -380,6 +380,11 @@ gitea_enabled: False
 gitea_url: /gitea
 gitea_port: 61734
 
+# JupyterHub programming environment with student Notebooks
+jupyterhub_install: False
+jupyterhub_enabled: False
+jupyterhub_port: 8000
+
 # Lokole (email for rural communities) from https://ascoderu.ca
 lokole_install: False
 lokole_enabled: False
@@ -564,9 +569,6 @@ phpmyadmin_enabled: False
 vnstat_install: False
 vnstat_enabled: False
 
-jupyterhub_install: False
-jupyterhub_enabled: False
-jupyterhub_port: 8000
 
 # 9-LOCAL-ADDONS
 
diff --git a/vars/local_vars_big.yml b/vars/local_vars_big.yml
index 3c244b915..e9fe79195 100644
--- a/vars/local_vars_big.yml
+++ b/vars/local_vars_big.yml
@@ -253,6 +253,10 @@ elgg_enabled: True
 gitea_install: True
 gitea_enabled: True
 
+# JupyterHub programming environment with student Notebooks
+jupyterhub_install: True
+jupyterhub_enabled: True
+
 # Lokole (email for rural communities) from https://ascoderu.ca
 lokole_install: True
 lokole_enabled: True
diff --git a/vars/local_vars_medium.yml b/vars/local_vars_medium.yml
index 887b0a165..e201b0669 100644
--- a/vars/local_vars_medium.yml
+++ b/vars/local_vars_medium.yml
@@ -253,6 +253,10 @@ elgg_enabled: False
 gitea_install: False
 gitea_enabled: False
 
+# JupyterHub programming environment with student Notebooks
+jupyterhub_install: False
+jupyterhub_enabled: False
+
 # Lokole (email for rural communities) from https://ascoderu.ca
 lokole_install: False
 lokole_enabled: False
diff --git a/vars/local_vars_min.yml b/vars/local_vars_min.yml
index 10dab276c..db25fa66d 100644
--- a/vars/local_vars_min.yml
+++ b/vars/local_vars_min.yml
@@ -253,6 +253,10 @@ elgg_enabled: False
 gitea_install: False
 gitea_enabled: False
 
+# JupyterHub programming environment with student Notebooks
+jupyterhub_install: False
+jupyterhub_enabled: False
+
 # Lokole (email for rural communities) from https://ascoderu.ca
 lokole_install: False
 lokole_enabled: False