CMS 6: Moving site from one server to another

I'm trying to move a CMS 6 site from one server to another but keep getting the same "Object reference not set to an instance of an object." error. The stack trace seems to indicate that EPiServer is at least called. Was some 6 years ago since I last installed a CMS 6 site and I feel a bit rusty on the proper procedure.

The steps I've taken is as follows:

Backuped and restored the database.
Moved all the application files.
Backuped the VPP but not moved it to the new server yet since I'm on a bad connection most of the time.
Exported the IIS settings from the old server and imported them to the new one.
Tried to fix the security settings so that IIS can access to site. Seems working since the error is mentioning EPiServer.

This is the stack trace I'm getting:

[NullReferenceException: Object reference not set to an instance of an object.]
EPiServer.Web.UrlRewriteModule.HttpUrlRewriteToInternal(UrlBuilder url) +316
EPiServer.Web.UrlRewriteModuleBase.BeginRequestEventHandler(Object sender, EventArgs e) +203
System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +79
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +170

Anyone maybe have some idea of what I can do to debug this anymore? I'm kinda stuck..