diff --git a/plinth/modules/diagnostics/templates/diagnostics_button.html b/plinth/modules/diagnostics/templates/diagnostics_button.html
index 6126a8743..4f463c51c 100644
--- a/plinth/modules/diagnostics/templates/diagnostics_button.html
+++ b/plinth/modules/diagnostics/templates/diagnostics_button.html
@@ -23,6 +23,11 @@
       action="{% url 'diagnostics:module' module %}">
   {% csrf_token %}
 
-  <input type="submit" class="btn btn-default"
-         value="{% trans "Run Diagnostics" %}"/>
+  {% if enabled %}
+    <input type="submit" class="btn btn-default"
+           value="{% trans "Run Diagnostics" %}"/>
+  {% else %}
+    <input type="submit" class="btn btn-default"
+           value="{% trans "Run Diagnostics" %}" disabled="disabled"/>
+  {% endif %}
 </form>
diff --git a/plinth/modules/letsencrypt/templates/letsencrypt.html b/plinth/modules/letsencrypt/templates/letsencrypt.html
index 5bc9c225e..e258ca2c3 100644
--- a/plinth/modules/letsencrypt/templates/letsencrypt.html
+++ b/plinth/modules/letsencrypt/templates/letsencrypt.html
@@ -100,7 +100,7 @@
       </div>
     </div>
 
-    {% include "diagnostics_button.html" with module="letsencrypt" %}
+    {% include "diagnostics_button.html" with module="letsencrypt" enabled=True %}
   {% else %}
     {% blocktrans trimmed %}
       No domains have been configured. Configure domains to be able to
diff --git a/plinth/modules/networks/templates/connections_list.html b/plinth/modules/networks/templates/connections_list.html
index 506c354ac..862db5b29 100644
--- a/plinth/modules/networks/templates/connections_list.html
+++ b/plinth/modules/networks/templates/connections_list.html
@@ -108,7 +108,7 @@
 
       {% include "connections_diagram.html" %}
 
-      {% include "diagnostics_button.html" with module="networks" %}
+      {% include "diagnostics_button.html" with module="networks" enabled=True %}
     </div>
   </div>
 
diff --git a/plinth/modules/openvpn/templates/openvpn.html b/plinth/modules/openvpn/templates/openvpn.html
index 3bbdf74ef..ac65c4ad9 100644
--- a/plinth/modules/openvpn/templates/openvpn.html
+++ b/plinth/modules/openvpn/templates/openvpn.html
@@ -111,7 +111,7 @@
       {% endif %}
     </p>
 
-    {% include "diagnostics_button.html" with module="openvpn" %}
+    {% include "diagnostics_button.html" with module="openvpn" enabled=status.is_running %}
 
     <h3>{% trans "Configuration" %}</h3>
 
diff --git a/plinth/modules/tor/templates/tor.html b/plinth/modules/tor/templates/tor.html
index 2bd0be414..736ec84ad 100644
--- a/plinth/modules/tor/templates/tor.html
+++ b/plinth/modules/tor/templates/tor.html
@@ -53,7 +53,7 @@
       {% endif %}
     </p>
 
-    {% include "diagnostics_button.html" with module="tor" %}
+    {% include "diagnostics_button.html" with module="tor" enabled=status.is_running %}
 
     {% if status.hs_enabled %}
       <div class="row">
diff --git a/plinth/modules/users/templates/users_list.html b/plinth/modules/users/templates/users_list.html
index 35ab68f8c..71978225d 100644
--- a/plinth/modules/users/templates/users_list.html
+++ b/plinth/modules/users/templates/users_list.html
@@ -64,7 +64,7 @@
         {% endfor %}
       </div>
 
-      {% include "diagnostics_button.html" with module="users" %}
+      {% include "diagnostics_button.html" with module="users" enabled=True %}
     </div>
   </div>
 
diff --git a/plinth/templates/service.html b/plinth/templates/service.html
index 45a146689..549a8e63d 100644
--- a/plinth/templates/service.html
+++ b/plinth/templates/service.html
@@ -57,7 +57,7 @@
 
   {% block diagnostics %}
     {% if diagnostics_module_name %}
-      {% include "diagnostics_button.html" with module=diagnostics_module_name %}
+      {% include "diagnostics_button.html" with module=diagnostics_module_name enabled=service.is_running %}
     {% endif %}
   {% endblock %}