yes, as stated seems not a problem with your code. Browsing the link you'll have:

La forma en que intenta acceder al sistema de pago no es correcta.

Este mensaje lo puede estar viendo por dos motivos:

1.- Nos envía el formulario con los datos por método GET.
2.- Está usted intentando navegar por esta página; esta pagina no está
+ accesible para entrar directamente desde el navegador de internet.

Para acceder correctamente al TPV Virtual debe enviar a esta URL un fo
+rmulario HTML mediante POST, con los parámetros descritos en la docum
+entación que se obtiene a través del módulo de administración.

Por favor, tenga en cuenta esto para poder realizar pagos por internet
+ con nuestro sistema.
[download]

And using my, still not perfect, WebTimeLoad.0.23.pl i got:

#webtimeload23.pl -u https://sis-t.redsys.es:25443/sis/entradaXMLEntid
+ad/ -v 4 -h
====================================================================
https://sis-t.redsys.es:25443/sis/entradaxmlentidad     Tue Nov  4 11:
+17:21 2014
--------------------------------------------------------------------
Response code:            404
Response message:         Not Found
Response server:          UNDEF
Response declared length: 219
Response title:           404 Not Found
--------------------------------------------------------------------
main page content (1):  219.0000 bytes in 61.573974 seconds @ 3.5567 b
+ytes/s)
--------------------------------------------------------------------
        detail of loaded pages (url):
--------------------------------------------------------------------
        https://sis-t.redsys.es:25443/sis/entradaxmlentidad
--------------------------------------------------------------------
no included content found.
no external content found.
no broken links found.
--------------------------------------------------------------------
downloaded 219.0000 bytes (219 bytes) in 61.573974 seconds (3.5567 byt
+es/s)
====================================================================
headers received:
--------------------------------------------------------------------
Connection: close
Date: Tue, 04 Nov 2014 10:17:20 GMT
Content-Length: 219
Content-Type: text/html; charset=iso-8859-1
Client-Date: Tue, 04 Nov 2014 10:17:21 GMT
Client-Peer: 195.76.9.247:25443
Client-Response-Num: 1
Client-SSL-Cert-Issuer: /C=US/O=VeriSign, Inc./OU=VeriSign Trust Netwo
+rk/OU=Terms of use at https://www.verisign.com/rpa
 (c)10/CN=VeriSign Class 3 International Server CA - G3
Client-SSL-Cert-Subject: /C=ES/ST=Madrid/L=Madrid/O=REDSYS SERVICIOS D
+E PROCESAMIENTO, S.L./OU=REDSYS SERVICIOS DE PROCE
SAMIENTO, S.L./CN=sis-t.redsys.es
Client-SSL-Cipher: AES128-SHA
Client-SSL-Warning: Peer certificate not verified
Set-Cookie: TS8e1dfd=a50bf1628fedf28fafe3b2ec1d8aca3ea874d6dd7c147bd15
+458a7b0; Path=/
Title: 404 Not Found

====================================================================
[download]

HtH
L*

---

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