I have read many articles, tried various things and now going round in circles. Is anyone able to point me in the right direction, which certificate has expired. When I checked them they are valid? Many thanks in advance Arron tls { ca_file = "/etc/openldap/certs/cacert.pem" ca_path = "/etc/openldap/certs" certificate_file = "/etc/openldap/certs/radius.pem" private_key_file = "/etc/openldap/certs/radius.key" start_tls = yes } } rlm_ldap: Falling back to build time libldap version info. Query for LDAP_OPT_API_INFO returned: -1 rlm_ldap: libldap vendor: OpenLDAP version: 20439 accounting { reference = "%{tolower:type.%{Acct-Status-Type}}" } post-auth { reference = "." } rlm_ldap (ldap): Initialising connection pool pool { start = 5 min = 4 max = 32 spare = 3 uses = 0 lifetime = 0 cleanup_interval = 30 idle_timeout = 60 retry_delay = 1 spread = no } rlm_ldap (ldap): Opening additional connection (0) rlm_ldap (ldap): Connecting to ldap.prom.co.uk:389 TLS: error: the certificate '/etc/openldap/certs/radius.pem' could not be found in the database - error -8174:security library: bad database.. TLS: certificate '/etc/openldap/certs/radius.pem' successfully loaded from PEM file. TLS: no unlocked certificate for certificate 'E=radius@domainA.co.uk,CN=domainA.dmz.local,OU=Company,O=Radius,L=Newbury,ST=Berkshire,C=GB'. TLS: certificate [(null)] is not valid - error -8181:Peer's Certificate has expired.. TLS: error: connect - force handshake failure: errno 21 - moznss error -8174 TLS: can't connect: TLS error -8174:security library: bad database.. rlm_ldap (ldap): Could not start TLS: Connect error rlm_ldap (ldap): Opening connection failed (0) rlm_ldap (ldap): Removing connection pool /etc/raddb/mods-enabled/ldap[8]: Instantiation failed for module "ldap"