Custom error 404 won't redirect on link click

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ASP.NET4

Hi there! Trust your day went well! I am having a challenge that I have been battling to settle for a long time but could. Why? Maybe because I don't know the right keywords to use in my search cos to be sincere am so confused.

I have a customized error 404 page that is specified in my web.config as shown below:

<httpErrors errorMode="Custom" existingResponse="Replace">
  <remove statusCode="404" />
  <error statusCode="404" path="/derrors/404.aspx" responseMode="ExecuteURL" />
  <remove statusCode="500" />
  <error statusCode="500" path="/derrors/500.aspx" responseMode="ExecuteURL" />
</httpErrors>

While in my codebehind, I have this:

Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
    Server.ClearError()
    Response.TrySkipIisCustomErrors = True 'for IIS 7 integrated pipeine
    Response.Status = "404 Not Found"
    Response.StatusCode = 404
End Sub

This is working fine. But, there seems to be a problem that I could not solve so I decided to ask other gurus for help.

Now, here is the problem am facing: On the custom 404.aspx, I have a LinkButton whose click event fire the redirection code as below:

Protected Sub LinkButton1_Click(sender As Object, e As EventArgs) Handles LinkButton1.Click
    Response.RedirectToRoute("welcome")


End Sub

So, take for instance the site login page as: example.com/login, and mistakenly, the person typed example.com/logn. The user will be redirected to Error 404: Page Not Found exactly as I wanted.


But this LinkButton1 when clicked, will redirect to something like example.com/logn?404%3bhttps%3a%2f%2fwww.example.com%3a443%2flogn

What am I doing wrong here.

Please kindly help

What I have tried:

I have searched the net, yet no good result