This error occurs while creating SharePoint site collection. Error Occurs while executing below ps script: $web = Get-SPWebApplication http://spapp:1400/New-SPSite http://spapp:1400/ -OwnerAlias “ad\farmUser” -HostHeaderWebApplication $web -Name “Demo Team Site<Site name>” -Template STS#0 Exact error: Cause of Error: SharePoint prevents the creation of a host-named site collection with the same URL as a Web application. If you want to create a Root Site Collection a the top … Continue reading New-SPSite : The URL “http://SharePointUrl/” is in use as an alternate access URL or as the URL of a host header site. Please choose a different URL and try again.