IIS 7 reveals internal IP address - appcmd.exe help [PCI scan / PEN testing failure]

Hi experts
I have a Exchange 2010 server which has failed a PCI compliance scan during PEN testing.
I need to apply the fix detailed below, which uses appcmd.exe.  I have little knowledge of IIS.
http://blogs.msdn.com/b/mike/archive/2008/11/18/removing-an-iis-server-s-ip-address-from-http-
responses.aspx

suggested cmd is:
appcmd.exe set config -section:system.webServer/serverRuntime /alternateHostName:"myServer"  /commit:apphost

Before I run this cmd I want to find out if my server has an existing alternateHostName and if so what it is.  This is essentially because I want to be able to return be install to it current state in the event this fix causes side effects.

How can I use appcmd.exe [supply code] to find the alternateHostName?
fieldjAsked:
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David Johnson, CD, MVPOwnerCommented:
there are no known side effects of using that fix other than passing your pci text
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fieldjAuthor Commented:
Thanks David
Do you know how can I use appcmd.exe [supply code] to find the alternateHostName?
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fieldjAuthor Commented:
I ran the following cmd to backup my IIS config
C:\Windows\System32\inetsrv>appcmd.exe add backup "My Backup Name"
You can confirm this with
C:\Windows\System32\inetsrv>appcmd.exe list backups
And restore if need be
C:\Windows\System32\inetsrv>appcmd.exe restore backup "My Backup Name"

Then I ran the cmd
C:\Windows\System32\inetsrv>appcmd.exe set config "Default Web Site" -section:sy
stem.webServer/serverRuntime /enabled:"True"  /commit:apphost

Followed by the cmd in the posted article
C:\Windows\System32\inetsrv>appcmd.exe set config -section:system.webServer/serv
erRuntime /alternateHostName:"ServerName"  /commit:apphost
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fieldjAuthor Commented:
best answer of the responses
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