diff --git a/plinth/modules/transmission/__init__.py b/plinth/modules/transmission/__init__.py
index 5aeb3959a..ae681c195 100644
--- a/plinth/modules/transmission/__init__.py
+++ b/plinth/modules/transmission/__init__.py
@@ -53,3 +53,16 @@ def is_enabled():
 def is_running():
     """Return whether the service is running."""
     return action_utils.service_is_running('transmission-daemon')
+
+
+def diagnose():
+    """Run diagnostics and return the results."""
+    results = []
+
+    results.append(action_utils.diagnose_port_listening(9091, 'tcp4'))
+    results.append(action_utils.diagnose_port_listening(9091, 'tcp6'))
+    results.extend(action_utils.diagnose_url_on_all(
+        'https://{host}/transmission',
+        extra_options=['--no-check-certificate']))
+
+    return results
diff --git a/plinth/modules/transmission/templates/transmission.html b/plinth/modules/transmission/templates/transmission.html
index fa4736e16..63d330a62 100644
--- a/plinth/modules/transmission/templates/transmission.html
+++ b/plinth/modules/transmission/templates/transmission.html
@@ -32,13 +32,14 @@
 
 <h3>Status</h3>
 
-<p>
+<p class="running-status-parent">
   {% if status.is_running %}
   <span class='running-status active'></span> Transmission daemon is running
   {% else %}
   <span class='running-status inactive'></span> Transmission daemon is not running
   {% endif %}
 </p>
+{% include "diagnostics_button.html" with module="transmission" %}
 
 <h3>Configuration</h3>