KB 0035
During installation, 'Fatal Error' dialog appears with the message 'Disk1.cab has an invalid digital signature. This may indicate that the cabinet file is corrupt.'

CATEGORY

OPC DA Server

 

SYMPTOMS

You receive the following error message when you try to install an OPC Server:

Disk1.cab has an invalid digital signature. This may indicate that the cabinet file is corrupt.

 

CAUSE

Automated Solutions digitally signs its installation packages to ensure that the installation software has not been tampered with.

This error can occur when the target machine has no internet connection and Windows Installer fails to verify online the digital signature.

Since Windows installer is unable to contact the certificate provider that can verify the installer's security certificate, it will prompt with that error during installation.

 

SOLUTION

There are two workarounds for this issue, select the most appropriate:

1. Configure the PC's network connection so that it has Internet access and then run the installation again. This will allow the digital signature to be verified. The Internet connection can be disabled once the ASComm.NET install has completed.
    
2. Follow the instructions in this PDF file to manually download and update required root certificates.
   
   Instructions for downloading and installing required root certificates