diff --git a/source/app/controllers/util.py b/source/app/controllers/util.py
index 318fe6f..9f5d07e 100644
--- a/source/app/controllers/util.py
+++ b/source/app/controllers/util.py
@@ -53,7 +53,7 @@ def _get_md5(data):
     return hashlib.md5(data.encode()).hexdigest()
 
 
-def _save_temp(data, modo='wb'):
+def save_temp(data, modo='wb'):
     path = tempfile.mkstemp()[1]
     with open(path, modo) as f:
         f.write(data)
@@ -277,21 +277,22 @@ def to_slug(string):
 
 class Certificado(object):
 
-    def __init__(self, key, cer):
-        self._key = key
-        self._cer = cer
+    def __init__(self, paths):
+        self._path_key = paths['path_key']
+        self._path_cer = paths['path_cer']
         self._modulus = ''
-        self._save_files()
+        #~ self._save_files()
         self.error = ''
 
-    def _save_files(self):
-        try:
-            self._path_key = _save_temp(self._key)
-            self._path_cer = _save_temp(self._cer)
-        except:
-            self._path_key = ''
-            self._path_cer = ''
-        return
+    #~ def _save_files(self):
+        #~ try:
+            #~ self._path_key = _save_temp(bytes(self._key))
+            #~ self._path_cer = _save_temp(bytes(self._cer))
+        #~ except Exception as e:
+            #~ log.error(e)
+            #~ self._path_key = ''
+            #~ self._path_cer = ''
+        #~ return
 
     def _kill(self, path):
         try:
@@ -342,7 +343,7 @@ class Certificado(object):
         hasta  = parser.parse(dates[1].split('=')[1])
         self._modulus = _call(args.format(self._path_cer, 'modulus'))
 
-        data['cer'] = self._cer
+        data['cer'] = read_file(self._path_cer)
         data['cer_tmp'] = None
         data['cer_pem'] = cer_pem
         data['cer_txt'] = cer_txt.replace('\n', '')
@@ -366,7 +367,8 @@ class Certificado(object):
             'pass:"{}" -out "{}"'
         _call(args.format(tmp_cer, tmp_key, rfc,
             hashlib.md5(rfc.encode()).hexdigest(), tmp_p12))
-        data = open(tmp_p12, 'rb').read()
+        #~ data = open(tmp_p12, 'rb').read()
+        data = read_file(tmp_p12)
 
         self._kill(tmp_cer)
         self._kill(tmp_key)
@@ -397,7 +399,7 @@ class Certificado(object):
             self._path_key, password, _get_md5(rfc))
         key_enc = _call(args)
 
-        data['key'] = self._key
+        data['key'] = read_file(self._path_key)
         data['key_tmp'] = None
         data['key_enc'] = key_enc
         data['p12'] = self._get_p12(password, rfc)
@@ -405,7 +407,7 @@ class Certificado(object):
 
     def validate(self, password, rfc):
         if not self._path_key or not self._path_cer:
-            self.error = 'Error al cargar el certificado'
+            self.error = 'Error en las rutas temporales del certificado'
             return {}
 
         data = self._get_info_cer(rfc)
@@ -433,9 +435,9 @@ def make_xml(data, certificado):
     data = {
         'xsltproc': PATH_XSLTPROC,
         'xslt': _join(PATH_XSLT, 'cadena.xslt'),
-        'xml': _save_temp(xml, 'w'),
+        'xml': save_temp(xml, 'w'),
         'openssl': PATH_OPENSSL,
-        'key': _save_temp(certificado.key_enc, 'w'),
+        'key': save_temp(certificado.key_enc, 'w'),
         'pass': _get_md5(certificado.rfc)
     }
     args = '"{xsltproc}" "{xslt}" "{xml}" | ' \
@@ -1062,9 +1064,9 @@ def cancel_cfdi(uuid, pk12, rfc, auth):
 
     data = {
         'xmlsec': PATH_XMLSEC,
-        'pk12': _save_temp(pk12),
+        'pk12': save_temp(pk12),
         'pass': _get_md5(rfc),
-        'template': _save_temp(template, 'w'),
+        'template': save_temp(template, 'w'),
     }
     args = '"{xmlsec}" --sign --pkcs12 "{pk12}" --pwd {pass} ' \
         '"{template}"'.format(**data)
diff --git a/source/app/main.ini b/source/app/main.ini
index 6041275..9c5472f 100644
--- a/source/app/main.ini
+++ b/source/app/main.ini
@@ -2,6 +2,7 @@
 socket = 127.0.0.1:3033
 uid = nginx
 gid = nginx
+#~ Establece una ruta accesible para nginx
 chdir = /srv/app/empresa-libre/app
 wsgi-file = main.py
 callable = app
@@ -10,4 +11,5 @@ processes = 4
 threads = 4
 thunder-lock = true
 #~ stats = 127.0.0.1:9191
+#~ Establece una ruta accesible para nginx
 logger = file:/srv/log/empresalibre-uwsgi.log
diff --git a/source/app/main_debug.ini b/source/app/main_debug.ini
index 89cb94f..065dcfc 100644
--- a/source/app/main_debug.ini
+++ b/source/app/main_debug.ini
@@ -1,6 +1,5 @@
 [uwsgi]
 http = 127.0.0.1:8000
-#~ http = 37.228.132.181:9000
 wsgi-file = main.py
 callable = app
 master = true
diff --git a/source/app/models/db.py b/source/app/models/db.py
index ba042c8..1b09e1f 100644
--- a/source/app/models/db.py
+++ b/source/app/models/db.py
@@ -20,8 +20,8 @@ class StorageEngine(object):
     def add_config(self, values):
         return main.Configuracion.add(values)
 
-    def add_cert(self, file_object):
-        return main.Certificado.add(file_object)
+    def add_cert(self, file_obj):
+        return main.Certificado.add(file_obj)
 
     def validate_cert(self, values, session):
         return main.Certificado.validate(values, session)
diff --git a/source/app/models/main.py b/source/app/models/main.py
index 29de88b..93274c7 100644
--- a/source/app/models/main.py
+++ b/source/app/models/main.py
@@ -64,6 +64,9 @@ class Configuracion(BaseModel):
     clave = TextField(unique=True)
     valor = TextField(default='')
 
+    def __str__(self):
+        return '{} = {}'.format(self.clave, self.valor)
+
     @classmethod
     def get_(cls, keys):
         if keys['fields'] == 'correo':
@@ -74,7 +77,14 @@ class Configuracion(BaseModel):
                 .select()
                 .where(Configuracion.clave.in_(fields))
             )
-            values = {r.clave: r.valor for r in data}
+        elif keys['fields'] == 'path_cer':
+            fields = ('path_key', 'path_cer')
+            data = (Configuracion
+                .select()
+                .where(Configuracion.clave.in_(fields))
+            )
+
+        values = {r.clave: r.valor for r in data}
         return values
 
     @classmethod
@@ -316,28 +326,26 @@ class Certificado(BaseModel):
         return row
 
     def get_(cls):
-        if Certificado.select().count():
-            obj = Certificado.select()[0]
-        else:
-            obj = Certificado()
-        return obj
+        return Certificado.select()[0]
 
     @classmethod
-    def add(cls, file_object):
-        obj = cls.get_(cls)
-        if file_object.filename.endswith('key'):
-            obj.key_tmp = file_object.file.read()
-        elif file_object.filename.endswith('cer'):
-            obj.cer_tmp = file_object.file.read()
-        obj.save()
+    def add(cls, file_obj):
+        if file_obj.filename.endswith('key'):
+            path_key = util.save_temp(file_obj.file.read())
+            Configuracion.add({'path_key': path_key})
+        elif file_obj.filename.endswith('cer'):
+            path_cer = util.save_temp(file_obj.file.read())
+            Configuracion.add({'path_cer': path_cer})
         return {'status': 'server'}
 
     @classmethod
     def validate(cls, values, session):
         row = {}
         result = False
+
         obj = cls.get_(cls)
-        cert = util.Certificado(obj.key_tmp, obj.cer_tmp)
+        paths = Configuracion.get_({'fields': 'path_cer'})
+        cert = util.Certificado(paths)
         data = cert.validate(values['contra'], session['rfc'])
         if data:
             msg = 'Certificado guardado correctamente'
@@ -352,9 +360,12 @@ class Certificado(BaseModel):
                 }
         else:
             msg = cert.error
-            obj.key_tmp = None
-            obj.cer_tmp = None
-            obj.save()
+            #~ obj.key_tmp = None
+            #~ obj.cer_tmp = None
+            #~ obj.save()
+
+        Configuracion.add({'path_key': ''})
+        Configuracion.add({'path_cer': ''})
 
         return {'ok': result, 'msg': msg, 'data': row}