diff --git a/packages/concordia-app/src/constants/configuration/defaults.js b/packages/concordia-app/src/constants/configuration/defaults.js
index 1e72777..c288c9c 100644
--- a/packages/concordia-app/src/constants/configuration/defaults.js
+++ b/packages/concordia-app/src/constants/configuration/defaults.js
@@ -3,6 +3,9 @@ export const WEB3_PORT_DEFAULT = '8545';
 export const WEB3_PORT_SOCKET_TIMEOUT_DEFAULT = 30000;
 export const WEB3_PORT_SOCKET_CONNECT_MAX_ATTEMPTS_DEFAULT = 3;
 
+export const REACT_APP_CONCORDIA_HOST_DEFAULT = '127.0.0.1';
+export const REACT_APP_CONCORDIA_PORT_DEFAULT = '7000';
+
 export const REACT_APP_RENDEZVOUS_HOST_DEFAULT = '127.0.0.1';
 export const REACT_APP_RENDEZVOUS_PORT_DEFAULT = '9090';
 
diff --git a/packages/concordia-app/src/utils/drizzleUtils.js b/packages/concordia-app/src/utils/drizzleUtils.js
index 0f4291f..5496d85 100755
--- a/packages/concordia-app/src/utils/drizzleUtils.js
+++ b/packages/concordia-app/src/utils/drizzleUtils.js
@@ -1,6 +1,9 @@
 import {
+  REACT_APP_CONCORDIA_HOST_DEFAULT,
+  REACT_APP_CONCORDIA_PORT_DEFAULT,
   REACT_APP_CONTRACTS_SUPPLIER_HOST_DEFAULT,
-  REACT_APP_CONTRACTS_SUPPLIER_PORT_DEFAULT, REACT_APP_CONTRACTS_VERSION_HASH_DEFAULT,
+  REACT_APP_CONTRACTS_SUPPLIER_PORT_DEFAULT,
+  REACT_APP_CONTRACTS_VERSION_HASH_DEFAULT,
 } from '../constants/configuration/defaults';
 import CONTRACTS from '../constants/contracts/ContractNames';
 
@@ -11,13 +14,15 @@ function getContractsDownloadRequest() {
       || REACT_APP_CONTRACTS_SUPPLIER_PORT_DEFAULT;
   const CONTRACTS_VERSION_HASH = process.env.REACT_APP_CONTRACTS_VERSION_HASH
       || REACT_APP_CONTRACTS_VERSION_HASH_DEFAULT;
+  const HOST = process.env.REACT_APP_CONCORDIA_HOST || REACT_APP_CONCORDIA_HOST_DEFAULT;
+  const PORT = process.env.REACT_APP_CONCORDIA_PORT || REACT_APP_CONCORDIA_PORT_DEFAULT;
 
   const xhrRequest = new XMLHttpRequest();
 
   xhrRequest.open('GET',
     `http://${CONTRACTS_SUPPLIER_HOST}:${CONTRACTS_SUPPLIER_PORT}/contracts/${CONTRACTS_VERSION_HASH}`,
     false);
-  xhrRequest.setRequestHeader('Access-Control-Allow-Origin', 'http://localhost:7000');
+  xhrRequest.setRequestHeader('Access-Control-Allow-Origin', `${HOST}:${PORT}`);
   xhrRequest.setRequestHeader('Access-Control-Allow-Credentials', 'true');
 
   return xhrRequest;
@@ -31,7 +36,7 @@ function validateRemoteContracts(remoteContracts) {
 
   const contractsPresentStatus = CONTRACTS.map((contract) => ({
     contract,
-    present: remoteContracts.contains((remoteContract) => remoteContract.contractName === contract),
+    present: remoteContracts.includes((remoteContract) => remoteContract.contractName === contract),
   }));
 
   if (contractsPresentStatus.reduce((accumulator, contract) => accumulator && contract.present, true)) {
diff --git a/packages/concordia-contracts-provider/src/constants.js b/packages/concordia-contracts-provider/src/constants.js
index 8a17128..fbe54de 100755
--- a/packages/concordia-contracts-provider/src/constants.js
+++ b/packages/concordia-contracts-provider/src/constants.js
@@ -2,7 +2,7 @@ import path from 'path';
 
 const PROVIDER_PORT = '8400';
 const UPLOAD_CONTRACTS_DIRECTORY = path.join(__dirname, '..', 'contracts-uploads');
-const CORS_ALLOWED_ORIGINS = ['localhost:7000', '127.0.0.1:7000'];
+const CORS_ALLOWED_ORIGINS = ['http://127.0.0.1:7000', 'http://localhost:7000'];
 
 export default {
   port: PROVIDER_PORT,