diff --git a/001-Jupyter/Activate_JupyterJSC_2-factor-authentication.ipynb b/001-Jupyter/Activate_JupyterJSC_2-factor-authentication.ipynb
index 847187c4a8af92c9227680fd90815b4b4bc70421..b838f65c3b722c453a50cb00b14bc49ff6203900 100644
--- a/001-Jupyter/Activate_JupyterJSC_2-factor-authentication.ipynb
+++ b/001-Jupyter/Activate_JupyterJSC_2-factor-authentication.ipynb
@@ -22,7 +22,7 @@
    "source": [
     "# 2-Factor Authentication (2FA)\n",
     "<div>\n",
-    "   <img src=http://jupyter-jsc.fz-juelich.de/hub/static/images/2fa/jupyter-jsc_2fa_img01.png title=\"2-factor-authentication\" width=\"320\" style=\"float:left\"/>\n",
+    "   <img src=https://jupyter-jsc.fz-juelich.de/hub/static/images/2fa/jupyter-jsc_2fa_img01.png title=\"2-factor-authentication\" width=\"320\" style=\"float:left\"/>\n",
     "   <!-- <img src=images/jupyter-jsc_2fa_img01.png title=\"2-factor-authentication\" width=\"320\" style=\"float:left\"/> -->\n",
     "</div>\n",
     "\n",
@@ -64,7 +64,7 @@
    "metadata": {},
    "source": [
     "<div>\n",
-    "   <img src=http://jupyter-jsc.fz-juelich.de/hub/static/images/2fa/jupyter-jsc_2fa_img02.png title=\"2-factor-authentication\" width=\"320\" style=\"float:left\"/>\n",
+    "   <img src=https://jupyter-jsc.fz-juelich.de/hub/static/images/2fa/jupyter-jsc_2fa_img02.png title=\"2-factor-authentication\" width=\"320\" style=\"float:left\"/>\n",
     "   <!-- <img src=images/jupyter-jsc_2fa_img02.png title=\"2-factor-authentication\" width=\"320\" style=\"float:left\"/> -->\n",
     "</div>\n",
     "\n",
@@ -91,7 +91,7 @@
    "source": [
     "# How to get started with 2FA\n",
     "<div>\n",
-    "   <img src=http://jupyter-jsc.fz-juelich.de/hub/static/images/2fa/jupyter-jsc_2fa_img03.png title=\"2-factor-authentication\" width=\"320\" style=\"float:right\"/>\n",
+    "   <img src=https://jupyter-jsc.fz-juelich.de/hub/static/images/2fa/jupyter-jsc_2fa_img03.png title=\"2-factor-authentication\" width=\"320\" style=\"float:right\"/>\n",
     "   <!-- <img src=images/jupyter-jsc_2fa_img03.png title=\"2-factor-authentication\" width=\"320\" style=\"float:right\"/> -->\n",
     "</div>\n",
     "\n",
@@ -127,7 +127,7 @@
    "metadata": {},
    "source": [
     "<div>\n",
-    "   <img src=http://jupyter-jsc.fz-juelich.de/hub/static/images/2fa/jupyter-jsc_2fa_img04.png title=\"2-factor-authentication\" width=\"320\" style=\"float:left\"/>\n",
+    "   <img src=https://jupyter-jsc.fz-juelich.de/hub/static/images/2fa/jupyter-jsc_2fa_img04.png title=\"2-factor-authentication\" width=\"320\" style=\"float:left\"/>\n",
     "   <!-- <img src=images/jupyter-jsc_2fa_img04.png title=\"2-factor-authentication\" width=\"320\" style=\"float:left\"/> -->\n",
     "</div>\n",
     "\n",
@@ -150,7 +150,7 @@
    "metadata": {},
    "source": [
     "<div>\n",
-    "   <img src=http://jupyter-jsc.fz-juelich.de/hub/static/images/2fa/jupyter-jsc_2fa_img05.png title=\"2-factor-authentication\" width=\"320\" style=\"float:left\"/>\n",
+    "   <img src=https://jupyter-jsc.fz-juelich.de/hub/static/images/2fa/jupyter-jsc_2fa_img05.png title=\"2-factor-authentication\" width=\"320\" style=\"float:left\"/>\n",
     "   <!-- <img src=images/jupyter-jsc_2fa_img05.png title=\"2-factor-authentication\" width=\"320\" style=\"float:left\"/> -->\n",
     "</div>\n",
     "\n",
@@ -176,7 +176,7 @@
    "metadata": {},
    "source": [
     "<div>\n",
-    "   <img src=http://jupyter-jsc.fz-juelich.de/hub/static/images/2fa/jupyter-jsc_2fa_img06.png title=\"2-factor-authentication\" width=\"320\" style=\"float:right\"/>\n",
+    "   <img src=https://jupyter-jsc.fz-juelich.de/hub/static/images/2fa/jupyter-jsc_2fa_img06.png title=\"2-factor-authentication\" width=\"320\" style=\"float:right\"/>\n",
     "   <!-- <img src=images/jupyter-jsc_2fa_img06.png title=\"2-factor-authentication\" width=\"320\" style=\"float:right\"/> -->\n",
     "</div>\n",
     "\n",