diff -r a11153f696db web/org.openbravo.mobile.core/source/data/ob-datasource.js
--- a/web/org.openbravo.mobile.core/source/data/ob-datasource.js	Fri Aug 30 15:02:49 2019 +0200
+++ b/web/org.openbravo.mobile.core/source/data/ob-datasource.js	Fri Aug 30 15:03:44 2019 +0200
@@ -632,7 +632,8 @@
         });
         OB.DS.masterdataBackgroundModels = {};
 
-        OB.info(OB.I18N.getLabel('OBMOBC_MasterdataRequestError'));
+        OB.info(
+        OB.I18N.getLabel('OBMOBC_MasterdataRequestError') + '. URL which failed: ' + me.request.source);
         OB.UTIL.showI18NWarning('OBMOBC_MasterdataRequestError');
         if (
         data && data.exception && data.exception.message && data.exception.message === 'Application server is not available.') {