Hi, this question asked many times but no exact solution. Like all other people we moved all files with FTP transfer, set an IIS web site, gave required folder permissions but we are testing new one with a subdomain. 

Lets assume old web site: www.mysite.com

New one: a.mysite.com

When i check the log file only thing i can get the error below and an empty screen says DNN Error and a Return To site button:

2018-02-12 18:55:30,905 [S34VM-KZIISC02][Thread:15][FATAL] DotNetNuke.Framework.PageBase - An error has occurred while loading page.

System.NullReferenceException: Object reference not set to an instance of an object.

   at DotNetNuke.Framework.DefaultPage.InitializePage()

   at DotNetNuke.Framework.DefaultPage.OnInit(EventArgs e)

   at System.Web.UI.Control.InitRecursive(Control namingContainer)

   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

2018-02-12 18:55:30,905 [S34VM-KZIISC02][Thread:15][ERROR] DotNetNuke.Services.Exceptions.Exceptions - ~/Default.aspx?error=An unexpected error has occurred&content=0

System.NullReferenceException: Object reference not set to an instance of an object.

   at DotNetNuke.Framework.DefaultPage.InitializePage()

   at DotNetNuke.Framework.DefaultPage.OnInit(EventArgs e)

   at System.Web.UI.Control.InitRecursive(Control namingContainer)

   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

2018-02-12 18:55:30,921 [S34VM-KZIISC02][Thread:10][FATAL] DotNetNuke.Framework.PageBase - An error has occurred while loading page.

System.NullReferenceException: Object reference not set to an instance of an object.

   at DotNetNuke.Framework.DefaultPage.InitializePage()

   at DotNetNuke.Framework.DefaultPage.OnInit(EventArgs e)

   at System.Web.UI.Control.InitRecursive(Control namingContainer)

   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

2018-02-12 18:55:30,921 [S34VM-KZIISC02][Thread:10][ERROR] DotNetNuke.Services.Exceptions.Exceptions - ~/Default.aspx?error=terminate

System.NullReferenceException: Object reference not set to an instance of an object.

   at DotNetNuke.Framework.DefaultPage.InitializePage()

   at DotNetNuke.Framework.DefaultPage.OnInit(EventArgs e)

   at System.Web.UI.Control.InitRecursive(Control namingContainer)

   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

2018-02-12 18:55:30,937 [S34VM-KZIISC02][Thread:10][ERROR] DotNetNuke.Services.Exceptions.Exceptions - DotNetNuke.Services.Exceptions.PageLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object.

   at DotNetNuke.Framework.DefaultPage.InitializePage()

   at DotNetNuke.Framework.DefaultPage.OnInit(EventArgs e)

   at System.Web.UI.Control.InitRecursive(Control namingContainer)

   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

   --- End of inner exception stack trace ---

 

 

My Question is , should i add subdomain (a.mysite.com) to domainalias in the database?

when moving a DNN instance to a new location and you want to use temporary URLs for each domain in your DNN instance (even if it is just a single one), you need to tell DNN about this new address. This information is stored in the database, table PortalAlias, where you might need to adopt the site addresses.

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Cheers from Germany,
Sebastian Leupold

   

Speed up your DNN Websites with TurboDNN

you may just add another alias for your site, if you are not using redirect mode and have another alias marked as primary (there must exist not more than one primary alias per site and language),

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Cheers from Germany,
Sebastian Leupold

   

Speed up your DNN Websites with TurboDNN