Masking/Hiding original URL?

Let's add some logging to the iRule to see what's going on:

when HTTP_REQUEST {
  set origURI [HTTP::uri]
  set newURI "/irj/portal[HTTP::uri]"
  HTTP::uri $newURI
  log local0. "Original URI: $origURI"
  log local0. "Rewritten URI: $newURI"
}
when HTTP_RESPONSE {
  if { [HTTP::status] starts_with "3" } {
    set origRedir [HTTP::header Location]
    set newRedir [string map {":50100/irj/portal" "" } [HTTP::header Location]]
    HTTP::header replace Location $newRedir
    log local0. "Original redirect: $origRedir."
    log local0. "Rewritten redirect $newRedir"
  }
}

Log will write to /var/log/ltm, or Local Traffic log in the GUI. Examine output for clues.

If it doesn't reveal itself, I'd recommend making one change at a time & verifying each is having the desired effect per the descriptions in my previous post, then posting back with any specific challenges you encounter, and we'll take it from there.

HTH

/deb