[wix-users] MSI asks for credentials to remove existing products

John Cooper JoCooper at jackhenry.com
Wed Sep 16 05:30:10 PDT 2015

I believe there was a Windows Security update that changed this behavior.

John Merryweather Cooper
Senior Software Engineer | Integration Development Group | Enterprise Notification Service
Jack Henry & Associates, Inc.® | Lenexa, KS  66214 | Ext:  431050 |JoCooper at jackhenry.com

-----Original Message-----
From: wix-users [mailto:wix-users-bounces at lists.wixtoolset.org] On Behalf Of Adan
Sent: Wednesday, September 16, 2015 7:24 AM
To: wix-users at lists.wixtoolset.org
Subject: [wix-users] MSI asks for credentials to remove existing products

The e-mail below is from an external source.  Please do not open attachments or click links from an unknown or suspicious origin.

I have a windows desktop software that requires administration rights to install. The software is capable to auto-update itself if it finds an MSI with higher version than its own.
To do this new installation, there is an encrypted file with credentials for an administrator on the domain and the following steps are followed:

- The software will run a command to advertise the MSI with the credentials provided in the file as admin. (msiexec /jm path...)
- Then, with the current user logged into windows, it will run a command to install the MSI. (msiexec /i Path...)

It has been working well for many updates but in the last update, in some machines only, Windows Installer is asking for admin credentials to the user to remove the existing version. Instead of just showing an elevation prompt without login requirements.
There is no change in the wix xml file and the upgrade section is as follow:

<MajorUpgrade Schedule="afterInstallInitialize" DowngradeErrorMessage="A newer version of [ProductName] is already installed."/>

The verbose log does not show error before the un-install, just after the user cancells. It just comes with a need for credentials:

MSI (s) (60:AC) [18:41:10:512]: MSI_LUA: Elevation required to install product, will prompt for credentials MSI (s) (60:AC) [18:41:27:782]: MSI_LUA: Credential Request return =
User cancelled installation.
CustomAction  returned actual error code 1602 but will be translated to success due to continue marking Action ended 18:41:27: RemoveExistingProducts. Return value 2.

And it also shows that the user in use is indeed the admin from the file with credentials.

Could someone please lead me in a direction? I though RemoveExistingProducts action runs with server privileges.
The other thing that is frustrating me a lot is the fact that t works in some machines well.

Many thanks!

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