Hi, While doing the User Registration https://forge.fi-ware.org/plugins/mediawiki/wiki/fiware/index.php/Access_Control_-_Installation_and_Administration_Guide#User_Registration , actually while registering in the User Database, the way to get the subject DN (UUID) is not trivial, so we suggest to add some extra information in order to make it easier. If helps, we did this: openssl x509 -in johndoe-taz-client-cert.pem -text | grep CN= OS: Ubuntu 14.04 Server x64 Regards, Alberto Martín
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