diff --git a/plinth/modules/mumble/__init__.py b/plinth/modules/mumble/__init__.py
index 07b36981e..d25adff87 100644
--- a/plinth/modules/mumble/__init__.py
+++ b/plinth/modules/mumble/__init__.py
@@ -52,3 +52,15 @@ def is_enabled():
 def is_running():
     """Return whether the service is running."""
     return action_utils.service_is_running('mumble-server')
+
+
+def diagnose():
+    """Run diagnostics and return the results."""
+    results = []
+
+    results.append(action_utils.diagnose_port_listening(64738, 'tcp4'))
+    results.append(action_utils.diagnose_port_listening(64738, 'tcp6'))
+    results.append(action_utils.diagnose_port_listening(64738, 'udp4'))
+    results.append(action_utils.diagnose_port_listening(64738, 'udp6'))
+
+    return results
diff --git a/plinth/modules/mumble/templates/mumble.html b/plinth/modules/mumble/templates/mumble.html
index a36f0e26d..1cfb7d4c6 100644
--- a/plinth/modules/mumble/templates/mumble.html
+++ b/plinth/modules/mumble/templates/mumble.html
@@ -34,13 +34,15 @@
 
 <h3>Status</h3>
 
-<p>
+<p class="running-status-parent">
   {% if status.is_running %}
-  <span class='running-status active'></span> Mumble server is running
+  <span class="running-status active"></span> Mumble server is running
   {% else %}
-  <span class='running-status inactive'></span> Mumble server is not running
+  <span class="running-status inactive"></span> Mumble server is not running
   {% endif %}
 </p>
+{% include "diagnostics_button.html" with module="mumble" %}
+
 
 <h3>Configuration</h3>