Installation is one of the first places in which help may be required if an error occurs. Logs are created in the %TEMP% directory on the machine during installation of the Office Communications Server. The *.log files contain progress and error information from setup and the installer. The *.html files contain clear progress and error information from activation and prep actions. When seemingly silent failures occur during installation, activation, or prep steps during deployment, installation information is the first place to look.
Diagnosing Setup Failures
Setup logs are located under %TEMP% and have either the .log (for Microsoft Installer [MSI] logs) or .html extension (for activation/prep failures). In MSI logs, look for the phrase "value 3" (MSI errors are cryptic, and this is a quick method to locate them). The .html logs are self explanatory and can be expanded to the point of the failure. LcsCmd's "CheckXXState" is usually also very helpful. For example, to check whether the Audio/Video (AV) multipoint control unit (MCU) is activated, you can run LcsCmd /mcu /action:CheckLcServerState /role:AVMCU.
—Nirav Kamdar
18.119.160.42