diff --git a/lib/App/Netdisco/DB/Result/DevicePort.pm b/lib/App/Netdisco/DB/Result/DevicePort.pm
index e12f6290..457ef6a2 100644
--- a/lib/App/Netdisco/DB/Result/DevicePort.pm
+++ b/lib/App/Netdisco/DB/Result/DevicePort.pm
@@ -175,8 +175,7 @@ device port.
 
 __PACKAGE__->might_have( properties => 'App::Netdisco::DB::Result::DevicePortProperties', {
   'foreign.ip' => 'self.ip', 'foreign.port' => 'self.port',
-  }, { join_type => 'LEFT OUTER' }
-);
+});
 
 =head2 ssid
 
@@ -308,6 +307,15 @@ ID assigned to untagged frames received on the port).
 
 sub native { return (shift)->vlan }
 
+=head2 error_disable_cause
+
+Returns the textual reason given by the device if the port is in an error
+state, or else `undef` if the port is not in an error state.
+
+=cut
+
+sub error_disable_cause { return (shift)->get_column('properties_error_disable_cause') }
+
 =head2 vlan_count
 
 Returns the number of VLANs active on this device port. Enable this column by
diff --git a/lib/App/Netdisco/DB/ResultSet/DevicePort.pm b/lib/App/Netdisco/DB/ResultSet/DevicePort.pm
index 84b619c6..ff270ba8 100644
--- a/lib/App/Netdisco/DB/ResultSet/DevicePort.pm
+++ b/lib/App/Netdisco/DB/ResultSet/DevicePort.pm
@@ -104,6 +104,32 @@ sub only_free_ports {
     );
 }
 
+=head2 with_properties
+
+This is a modifier for any C<search()> which
+will add the following additional synthesized columns to the result set:
+
+=over 4
+
+=item error_disable_cause
+
+=back
+
+=cut
+
+sub with_properties {
+  my ($rs, $cond, $attrs) = @_;
+
+  return $rs
+    ->search_rs($cond, $attrs)
+    ->search({},
+      {
+        '+select' => ['properties.error_disable_cause'],
+        '+as' => ['properties_error_disable_cause'],
+        join => 'properties',
+      });
+}
+
 =head2 with_vlan_count
 
 This is a modifier for any C<search()> (including the helpers below) which
diff --git a/lib/App/Netdisco/Web/Plugin/Device/Ports.pm b/lib/App/Netdisco/Web/Plugin/Device/Ports.pm
index 0e9f66b8..2e0619fa 100644
--- a/lib/App/Netdisco/Web/Plugin/Device/Ports.pm
+++ b/lib/App/Netdisco/Web/Plugin/Device/Ports.pm
@@ -18,7 +18,7 @@ get '/ajax/content/device/ports' => require_login sub {
 
     my $device = schema('netdisco')->resultset('Device')
       ->search_for_device($q) or send_error('Bad device', 400);
-    my $set = $device->ports;
+    my $set = $device->ports->with_properties;
 
     # refine by ports if requested
     my $f = param('f');
diff --git a/share/views/ajax/device/ports.tt b/share/views/ajax/device/ports.tt
index 7aa67ab3..7312cd3a 100644
--- a/share/views/ajax/device/ports.tt
+++ b/share/views/ajax/device/ports.tt
@@ -25,7 +25,9 @@
         [% IF row.up_admin != 'up' %]
         <i class="icon-remove"></i>
         [% ELSIF row.up == 'up' AND row.stp == 'blocking' AND vlans.$portname.vlan_count < 2 %]
-        <i class="icon-fullscreen text-info"></i>
+        <i class="icon-ban-circle text-info"></i>
+        [% ELSIF row.error_disable_cause %]
+        <i class="icon-exclamation-sign text-error"></i>
         [% ELSIF row.has_column_loaded('is_free') AND row.is_free %]
         <i class="icon-arrow-down text-success"></i>
         [% ELSIF row.up_admin == 'up' AND (row.up != 'up' AND row.up != 'dormant') %]
diff --git a/share/views/sidebar/device/ports.tt b/share/views/sidebar/device/ports.tt
index e6bcb12b..fb56d353 100644
--- a/share/views/sidebar/device/ports.tt
+++ b/share/views/sidebar/device/ports.tt
@@ -36,7 +36,8 @@
                   <li><i class="icon-li icon-arrow-down text-error"></i>&nbsp; Link Down</li>
                   <li><i class="icon-li icon-arrow-down text-success"></i>&nbsp; Port Free</li>
                   <li><i class="icon-li icon-remove"></i>&nbsp; Admin Disabled</li>
-                  <li><i class="icon-li icon-fullscreen text-info"></i>&nbsp; Blocking</li>
+                  <li><i class="icon-li icon-exclamation-sign text-error"></i>&nbsp; Error Disabled</li>
+                  <li><i class="icon-li icon-ban-circle text-info"></i>&nbsp; Blocking</li>
                   <li><i class="icon-li icon-link text-warning"></i>&nbsp; Manual Topology</li>
                   <li><i class="icon-li icon-link"></i>&nbsp; Neighbor Device</li>
                   <li><i class="icon-li icon-unlink text-error"></i>&nbsp; Neighbor Inacessible</li>