Persist Cookie and Domain Modification iRule question

[root@ve10:Active] config  b virtual bar list
virtual bar {
   snat automap
   pool foo
   destination 172.28.19.252:443
   ip protocol 6
   rules myrule
   profiles {
      clientssl {
         clientside
      }
      http {}
      tcp {}
   }
}
[root@ve10:Active] config  b rule myrule list
rule myrule {
   when HTTP_REQUEST {
  set mod_ck 0
  if { [HTTP::host] equals "accesscontrol.abc.com.au" and [HTTP::uri] starts_with "/Login/someapp" } {
    set mod_ck 1
  }
}
when HTTP_RESPONSE {
  if { $mod_ck } {
    HTTP::cookie insert name "setRequestAuthContxt" value SOMEKEY domain "abc.com.au"
  }
}
}

 set-cookie

[root@ve10:Active] config  curl -Ik https://accesscontrol.abc.com.au/Login/someapp
HTTP/1.1 404 Not Found
Date: Tue, 12 Mar 2013 10:22:49 GMT
Server: Apache/2.2.3 (CentOS)
Content-Type: text/html; charset=iso-8859-1
Set-Cookie: setRequestAuthContxt=SOMEKEY;domain=abc.com.au;

 no set-cookie

[root@ve10:Active] config  curl -Ik https://accesscontrol.abc.com.au/
HTTP/1.1 200 OK
Date: Tue, 12 Mar 2013 10:23:09 GMT
Server: Apache/2.2.3 (CentOS)
Last-Modified: Sat, 27 Oct 2012 03:22:35 GMT
ETag: "4183f3-59-f28f94c0"
Accept-Ranges: bytes
Content-Length: 89
Content-Type: text/html; charset=UTF-8