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.