diff --git a/src/samples/conference/public/scripts/index.js b/src/samples/conference/public/scripts/index.js
index fa63eb89..82eca356 100644
--- a/src/samples/conference/public/scripts/index.js
+++ b/src/samples/conference/public/scripts/index.js
@@ -196,6 +196,19 @@ const runSocketIOSample = function() {
                 console.log('Participants in conference: ' + participants.length);
             }, function(err) {
                 console.error('server connection failed:', err);
+                if (err.message.indexOf('connect_error:') >= 0) {
+                    const signalingHost = err.message.replace('connect_error:', '');
+                    const signalingUi = 'signaling';
+                    removeUi(signalingUi);
+                    let $p = $(`<div id=${signalingUi}> </div>`);
+                    const anchor = $('<a/>', {
+                        text: 'Click this for testing certificate and refresh',
+                        target: '_blank',
+                        href: `${signalingHost}/socket.io/`
+                    });
+                    anchor.appendTo($p);
+                    $p.appendTo($('body'));
+                }
             });
         });
     };
diff --git a/src/sdk/conference/signaling.js b/src/sdk/conference/signaling.js
index 92127b98..89a87d0f 100644
--- a/src/sdk/conference/signaling.js
+++ b/src/sdk/conference/signaling.js
@@ -79,6 +79,9 @@ export class SioSignaling extends EventModule.EventDispatcher {
           this.dispatchEvent(new EventModule.OwtEvent('disconnect'));
         }
       });
+      this._socket.on('connect_error', (e) => {
+        reject(`connect_error:${host}`);
+      });
       this._socket.on('drop', () => {
         this._reconnectTimes = reconnectionAttempts;
       });