WSS Agent installation failed

Products

• Cloud Secure Web Gateway - Cloud SWG

Issue/Introduction

During WSS Agent installation or upgrade the attempt fails with the following in the log:

Failed to grab execution mutex. System error 258.
MainEngineThread is returning 1618

Environment

WSS Agent on Windows OS

Cause

Microsoft defines the Windows Installer Action Return Value 1618 as:

ERROR_INSTALL_ALREADY_RUNNING
Another installation is in progress. Only one installation at a time can run actions in the InstallExecuteSequence, AdminExecuteSequence, or AdvtExecuteSequence tables.

Resolution

Wait for all pending software installations to complete before re-attempting WSS Agent installation. In some instances a system reboot may even be required by the Windows Installer Service for the installation(s) to complete.