Citrix Receiver for Windows and adding new account

We have/had the same problem. To get rid of the domain, I've modified your iRule. Now you just have to enter username and password in the Citrix Receiver.

when HTTP_REQUEST {
if { [HTTP::uri] eq "/AGServices/discover" } {
    HTTP::redirect "/vpn/index.html"
}
if { [HTTP::uri] starts_with "/Citrix/" } {
    if {[HTTP::header content-type] starts_with "text/xml"}{
    log local0. "*** Authentication Citrix Receiver ***"
        HTTP::collect [HTTP::header Content-Length]
        set ContentLength [HTTP::header Content-Length]
    }
  }
}
when HTTP_REQUEST_DATA {
 Please set your domain here 
    set Domain "domain.local"

    set Payload [HTTP::payload]
    set NewDomain "$Domain"
    log local0. "*** Replacing received domain \"$OldDomain\" with \"$Domain\" to \"$NewDomain\" ***"
    regsub -all $OldDomain $Payload $NewDomain Payload
    HTTP::payload replace 0 [HTTP::payload length] $Payload
    HTTP::release 
}

(Edit: Some minor changes in the iRule for setting the domain and logging.)