diff --git a/app/Controller/Auth.php b/app/Controller/Auth.php
index fef7f0e36..b98dff5da 100644
--- a/app/Controller/Auth.php
+++ b/app/Controller/Auth.php
@@ -55,8 +55,13 @@ class Auth extends Base
      */
     public function logout()
     {
-        $this->sessionManager->close();
-        $this->response->redirect($this->helper->url->to('auth', 'login'));
+        if (! DISABLE_LOGOUT) {
+            $this->sessionManager->close();
+            $this->response->redirect($this->helper->url->to('auth', 'login'));
+        }
+        else {
+            $this->response->redirect($this->helper->url->to('auth', 'index'));
+        }
     }
 
     /**
diff --git a/app/Template/header.php b/app/Template/header.php
index fd9ff24d4..72d89b808 100644
--- a/app/Template/header.php
+++ b/app/Template/header.php
@@ -84,13 +84,15 @@
                             <i class="fa fa-life-ring fa-fw"></i>
                             <?= $this->url->link(t('Documentation'), 'doc', 'show') ?>
                         </li>
-                        <li>
-                            <i class="fa fa-sign-out fa-fw"></i>
-                            <?= $this->url->link(t('Logout'), 'auth', 'logout') ?>
-                        </li>
+                        <?php if (! DISABLE_LOGOUT): ?>
+                            <li>
+                                <i class="fa fa-sign-out fa-fw"></i>
+                                <?= $this->url->link(t('Logout'), 'auth', 'logout') ?>
+                            </li>
+                        <?php endif ?>
                     </ul>
                 </div>
             </li>
         </ul>
     </nav>
-</header>
\ No newline at end of file
+</header>
diff --git a/app/constants.php b/app/constants.php
index 1740494e2..955edeb52 100644
--- a/app/constants.php
+++ b/app/constants.php
@@ -111,3 +111,6 @@ defined('HTTP_PROXY_HOSTNAME') or define('HTTP_PROXY_HOSTNAME', '');
 defined('HTTP_PROXY_PORT') or define('HTTP_PROXY_PORT', '3128');
 defined('HTTP_PROXY_USERNAME') or define('HTTP_PROXY_USERNAME', '');
 defined('HTTP_PROXY_PASSWORD') or define('HTTP_PROXY_PASSWORD', '');
+
+// Disabling logout (for external SSO authentication)
+defined('DISABLE_LOGOUT') or define('DISABLE_LOGOUT', 0);