Thanks for your answers, I have verified and it was a transcription issue, as you can see in the image the access error persists.
Other than security.properties did you modify other configuration files?
None
Since you mentioned your LDAP domain, are you integrating with an existing LDAP instance?
No, again I have left the security.properties file in its standard form, restarted ODK Sync Endpoint and the error persists.
thanks for your help