irule maintanance with redirection produces error

This is the situation:

We've following maintanance Irule (with your help much appreciated):

when HTTP_REQUEST {
    switch [HTTP::uri] {
        "/index.css" {
            HTTP::respond 200 content [ifile get index.css] "Content-Type" "text/css"
        } 
        "/logo.gif" {
            HTTP::respond 200 content [ifile get logo.gif] "Content-Type" "image/gif"
        }
        default {
            HTTP::respond 200 content [ifile get error.html] "Content-Type" "text/html"
        }
    }
} 

This matches our expectations on following url:

"https://www.y.com/GoSouth" "https://www.y.com/GoWest" Now we want to apply redirection and show the maintanance as well.

We apply redirection on following url:

https://www.x.com

With following irule:

 when HTTP_REQUEST {
   switch -glob [string tolower [HTTP::path]] {
      "*gosouth*" {
          add the redirect link ie "www.xyz.com"
         HTTP::redirect "https://www.y.com/GoSouth"
      }
      default {
          add the default action you prefer ie "www.def.com"
         HTTP::redirect "https://www.y.com/GoWest"
      }
   }
}

We applied the redirection irule on the www.x.com

Redirection works but doesn't show the images.

So we made a change in the redirection irule:
 when HTTP_REQUEST {
   switch -glob [string tolower [HTTP::path]] {
      "*gosouth*" {
          add the redirect link ie "www.xyz.com"
         HTTP::redirect "https://www.y.com/GoSouth"
      }
      default {
          add the default action you prefer ie "www.def.com"
         HTTP::redirect "https://www.y.com/"
      }
   }
}        

Now the images of the maintanance pages are visible on url:

"https://www.y.com/GoSouth" "https://www.y.com/GoWest"

But when we go to https://www.x.com -> redirected to https://www.y.com we get an "connection reset" error in the browser.

Any idea what's causing this? and which irule is responsible?