In case of ws, use the connected attribute

Instead of relying on non reliable source, directly
check the ws status

lib/modules/blockchain_connector/index.js

@@ -130,7 +130,7 @@ class BlockchainConnector {
     this.events.request("services:register", 'Ethereum', function (cb) {
       async.waterfall([
         function checkNodeConnection(next) {
-          if (!self.web3.currentProvider) {
+          if (!self.provider || !self.provider.connected()) {
             return next(NO_NODE, {name: "No Blockchain node found", status: 'off'});
           }
           next();

lib/modules/blockchain_connector/provider.js

@@ -26,8 +26,8 @@ class Provider {
     // The best choice is to use void origin, BUT Geth rejects void origin, so to keep both clients happy we can use http://embark
       self.provider = new this.web3.providers.WebsocketProvider(self.web3Endpoint, {headers: {Origin: "http://embark"}});
 
-      self.provider.on('error', e => self.logger.error('Websocket Error', e));
+      self.provider.on('error', () => self.logger.error('Websocket Error'));
-      self.provider.on('end', e => self.logger.error('Websocket connection ended', e));
+      self.provider.on('end', () => self.logger.error('Websocket connection ended'));
     } else {
       return callback(__("contracts config error: unknown deployment type %s", this.type));
     }
@@ -72,6 +72,16 @@ class Provider {
     });
   }
 
+  connected() {
+    if (this.type === 'rpc') {
+      return !!this.provider;
+    } else if (this.type === 'ws') {
+      return this.provider && this.provider.connected;
+    }
+
+    return false;
+  }
+
   stop() {
     if (this.provider && this.provider.removeAllListeners) {
       this.provider.removeAllListeners('connect');
@@ -79,8 +89,9 @@ class Provider {
       this.provider.removeAllListeners('end');
       this.provider.removeAllListeners('data');
       this.provider.responseCallbacks = {};
-      this.provider = null;
     }
+    this.provider = null;
+    this.web3.setProvider(null);
   }
 
   fundAccounts(callback) {