Tried to install S4B server 2015 in my lab. Tried this from a computer with no internet access, also I did not install any prerequisites.

“Error: Prerequisite installation failed: Prerequisite installation failed: SqlInstanceRtc For more information, check your SQL Server log files. Log files are in the folder C:\Program Files\Microsoft SQL Server\MSSQL*.Rtc\MSSQL\Log, where the * represents your SQL Server version number. For example, SQL Server 2012 uses this path: C:\Program Files\Microsoft SQL Server\MSSQL11.Rtc\MSSQL\Log.”

Interesting what could that be. I tried to look in the path specified, but that did not exist. So my secound choice was to look in %localappdata% (the usual place for Lync logfiles)

At least there was som logfile. I looked in the SQL setup log. Found some error messages, but nothing that explained the error.

Then I thought I would try to install some windows features to see if that may be the problem. At the error mentioned som prerequisites.

This also failed, but noe the error message was clear, the installation needed internet to download some features.

So now all I had to do was to connect the computer to internet an rerun S4B server sertup (“Prepare first standard edition server”). The installation now proceded flawless. The installer downloaded all that was needed.

Now we need all the stuff for the server install:

Add-WindowsFeature NET-Framework-Core, RSAT-ADDS, Windows-Identity-Foundation, Web-Static-Content, Web-Default-Doc, Web-Http-Errors, Web-Asp-Net, Web-Net-Ext, Web-ISAPI-Ext, Web-ISAPI-Filter, Web-Http-Logging, Web-Log-Libraries, Web-Request-Monitor, Web-Http-Tracing, Web-Basic-Auth, Web-Windows-Auth, Web-Client-Auth, Web-Filtering, Web-Stat-Compression, Web-Dyn-Compression, NET-WCF-HTTP-Activation45, Web-Asp-Net45, Web-Mgmt-Tools, Web-Scripting-Tools, Server-Media-Foundation -Restart