Created Unassigned: The IIS Web Site you have selected is in use by SharePoint. You must select another port or hostname. [20618]

I want the Web Applications "Portal" and "MySite" both run on port 80! When GUI tool I have "Use Host Header" is selected in the portal and MySite!

Here is the screenshot of the error message. Although in German, but on the website I have found the translation: http://support.microsoft.com/kb/927376/en-us

The IIS Web Site you have selected is in use by SharePoint. You must select another port or hostname.


Here are the screenshots of the GUI tool:



Here is the code from the XML file:

```
<WebApplications AddURLsToHOSTS="true">
<WebApplication type="Portal" name="Portal" applicationPool="Portal" url="http://localhost" port="80" UseHostHeader="true" AddURLToLocalIntranetZone="true" GrantCurrentUserFullControl="true" useClaims="true" useBasicAuthentication="false" useOnlineWebPartCatalog="false">
<Database>
<Name>Content_Portal</Name>
<DBServer />
<DBAlias Create="false" DBInstance="SERVER\INSTANCE" DBPort="" />
</Database>
<ManagedPaths>
<ManagedPath relativeUrl="help" explicit="true" />
</ManagedPaths>
<SiteCollections>
<SiteCollection siteUrl="http://localhost" HostNamedSiteCollection="false" Owner="SBG\svc_sps_install" Name="Portal Home" Description="Portal Home Site" CustomDatabase="" SearchUrl="http://localhost/search" CustomTemplate="false" Template="SPSPORTAL#0" LCID="1031" Locale="de-de" Time24="true" />
</SiteCollections>
</WebApplication>
<WebApplication type="MySiteHost" name="MySite Host" applicationPool="MySites" url="http://localhost" port="80" UseHostHeader="true" AddURLToLocalIntranetZone="true" GrantCurrentUserFullControl="true" useClaims="true" useBasicAuthentication="false" useOnlineWebPartCatalog="false">

```

Can anyone tell me how I get my Portal and MySite both run on port 80?

Alternative would create ONLY portal with port 80 and MySite manually create it, but I do not want!

The operating system is Windows Server 2008 R2, SharePoint Server 2013 is used