diff --git a/src/cfg/ogagent.cfg b/src/cfg/ogagent.cfg
index 09f3152..c7a52bd 100644
--- a/src/cfg/ogagent.cfg
+++ b/src/cfg/ogagent.cfg
@@ -36,6 +36,6 @@ urlMenu={}://{}/menu-browser
 urlMsg=http://localhost/cgi-bin/httpd-log.sh
 
 # TLS
-ca=/opt/opengnsys/ca.crt
-crt=/opt/opengnsys/ogagent.crt
-key=/opt/opengnsys/ogagent.key
+ca=/opt/opengnsys/etc/ca.crt
+crt=/opt/opengnsys/etc/ogagent.crt
+key=/opt/opengnsys/etc/ogagent.key
diff --git a/src/opengnsys/RESTApi.py b/src/opengnsys/RESTApi.py
index bf06b34..28ffd04 100644
--- a/src/opengnsys/RESTApi.py
+++ b/src/opengnsys/RESTApi.py
@@ -34,6 +34,7 @@
 
 
 
+import os
 import requests
 import logging
 import json
@@ -113,6 +114,14 @@ class REST(object):
             if not ca_file or not crt_file or not key_file:
                 raise Exception ('missing TLS parameters in REST constructor')
 
+            errs = 0
+            for f in [ca_file, crt_file, key_file]:
+                if not os.path.exists (f):
+                    logger.error (f'{f}: No such file or directory')
+                    errs += 1
+            if errs:
+                raise Exception ('TLS files not found')
+
         # Disable logging requests messages except for errors, ...
         logging.getLogger("requests").setLevel(logging.CRITICAL)
         # Tries to disable all warnings