Github user richardcloudsoft commented on a diff in the pull request:
https://github.com/apache/incubator-brooklyn/pull/650#discussion_r31115419
--- Diff: docs/guide/yaml/winrm/re-authentication.md ---
@@ -0,0 +1,38 @@
+---
+title: Re-authenticating within a powershell script
+title_in_menu: Re-authentication
+layout: website-normal
+---
+
+## How and Why to re-authenticate withing a powershell script
+
+Brooklyn will run powershell scripts by making a WinRM call over HTTP. For
most scripts this will work, however for
+some scripts (e.g. MSSQL installation), this will fail even if the script
can be run locally (e.g. by using RDP to
+connect to the machine and running the script manually)
+
+In the case of MS SQL server installation, there was no clear indication
of why this would not work. The only clue was
+a security exception in the installation log
+
+It appears that when a script is run over WinRM over HTTP, the credentials
under which the script are run are marked as
+'remote' credentials, which are prohibited from running certain
security-related operations. The solution was to obtain
+a new set of credentials within the script and use those credentials to
exeute the installer, so this:
+
+```
+( $driveLetter + "setup.exe") /ConfigurationFile=C:\ConfigurationFile.ini
+```
+
+became this:
+
+$pass = '${attribute['windows.password']}'
--- End diff --
Fence with ``` otherwise the formatting is mangled.
(In fact, fence with ```powershell to get syntax highlighting)
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