Microsoft (R) Program Maintenance Utility Version 14.29.30139.0 Copyright (C) Microsoft Corporation. All rights reserved. SignTool Error: The specified timestamp server either could not be reached or returned an invalid response. SignTool Error: An error occurred while attempting to sign: E:\buildsystem\src\MapManager-mapserver-7-6-x64\Installer\bin\Release\MapManager.msi NMAKE : fatal error U1077: 'E:\buildsystem\cert\sign.BAT' : return code '0x1' Stop.