For the test suite, I've generated a server cert with: Subject: C=US, ST=CA, O=OpenLDAP Foundation, OU=OpenLDAP Test Suite, CN=localhost and X509v3 Subject Alternative Name: DNS:localhost slapd is listening as: /home/build/git/symas-packages/thirdparty/openldap/build/UBUNTU16_64/symas-openldap/servers/slapd/.libs/lt-slapd -s0 -f /home/build/git/symas-packages/thirdparty/openldap/build/UBUNTU16_64/symas-openldap/tests/testrun/slapd.1.conf -h ldap://localhost:9011/ ldaps://localhost:9012/ -d 0x4105 I.e., slapd is referring to itself as "localhost", and the cert fully refers to itself as "localhost". However, if I do a startTLS op to this host with reqcert set to "demand", it fails with: TLS: hostname (u16build) does not match common name in certificate (localhost). Given that everything is using "localhost", it seems to me it should succeed rather than fail, and that this error is incorrect. The issue seems to be this if statement in tls_o.c: if( ldap_int_hostname && ( !name_in || !strcasecmp( name_in, "localhost" ) ) ) { if I remove the check against the "localhost" name, things succeed as expected. Is there something valid we are trying to protect against here? --Quanah -- Quanah Gibson-Mount Product Architect Symas Corporation Packaged, certified, and supported LDAP solutions powered by OpenLDAP: <http://www.symas.com>