Can't contact LDAP server remotely

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http://serverfault.com – I'm trying to configure a LDAP server with some basic security parameters, including TLS and required authenticated binding. I have started the server, and can access it from localhost with the command: ldapsearch -x -b 'dc=server,dc=com' 'objectclass=*' -W -D 'cn=manager,dc=server,dc=com' -H ldaps://server.com:389 When I try the same command remotely, from my computer, I get the following error message: ldap_sasl_bind(SIMPLE): Can't contact LDAP server (-1) I don't know why this happens, I can ping my server and there is currently no firewall. slapd is launched with -h ldaps://serv (HowTos)