Dear members, I have timeout issues with back-sql using mysql as backend (read-only). I could successfully setup open-ldap with back-sql querying from a mysql db. However there is a wait_timeout in mysql and if no query is being made for > then wait_timeout the slapd breaks and I have to restart it to connect to mysql again. http://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html As a workaround I could implement a cron-job to execute a query every x hour (depending on wait_timeout). However I would much more like that back-sql is able to (auto-)reconnect. I'm not a developer and have no idea how this can be done - maybe this is in the sql-wrap.c code? executing an ldap query after "wait_timeout" returns slapd.log: Jul 20 17:22:53 STAG-BCC slapd[2054]: ==>backsql_get_db_conn() Jul 20 17:22:53 STAG-BCC slapd[2054]: <==backsql_get_db_conn() Jul 20 17:22:53 STAG-BCC slapd[2054]: ==>backsql_attrlist_add(): adding "objectClass" to list Jul 20 17:22:53 STAG-BCC slapd[2054]: ==>backsql_dn2id("dc=bbn,dc=ch") matched expected Jul 20 17:22:53 STAG-BCC slapd[2054]: backsql_dn2id("dc=bbn,dc=ch"): id_query "SELECT id,keyval,oc_map_id,dn FROM ldap_entries WHERE dn=?" Jul 20 17:22:53 STAG-BCC slapd[2054]: backsql_dn2id("dc=bbn,dc=ch"): error executing query ("SELECT id,keyval,oc_map_id,dn FROM ldap_entries WHERE dn=?", "dc=bbn,dc=ch"): Jul 20 17:22:53 STAG-BCC slapd[2054]: Return code: -1 Jul 20 17:22:53 STAG-BCC slapd[2054]: nativeErrCode=2006 SQLengineState=08S01 msg="[MySQL][ODBC 5.1 Driver][mysqld-5.5.49-0+deb8u1]MySQL server has gone away" Jul 20 17:22:53 STAG-BCC slapd[2054]: <==backsql_dn2id("dc=bbn,dc=ch"): err=80 Any suggestions are most welcome Br Simon I'm using the following setup: ----------------------------- Debian Jessie x86_64 (up to date) Openldap-2.4.44 compiled from source with ./configure --enable-sql libmyodbc 5.1.10-3 mysql 5.5.49-9 odbc.ini: [ldapds] Driver = MySQL Description = BCC MySQL DB SERVER = 127.0.0.1 PORT = 3306 USER = ldap Password = ldap Database = prov_ldap SOCKET = /var/lib/mysql/mysql.sock odbcinst.ini: [MySQL] Description = ODBC for MySQL Driver = /usr/lib/x86_64-linux-gnu/odbc/libmyodbc.so Setup = /usr/lib/x86_64-linux-gnu/odbc/libodbcmyS.so FileUsage = 1 slapd.conf: include /usr/local/etc/openldap/schema/core.schema include /usr/local/etc/openldap/schema/cosine.schema include /usr/local/etc/openldap/schema/inetorgperson.schema include /usr/local/etc/openldap/schema/SIP.schema pidfile /usr/local/var/run/slapd.pid argsfile /usr/local/var/run/slapd.args loglevel any database sql suffix "dc=bbn,dc=ch" rootdn "dc=bbn,dc=ch" rootpw ldap dbname ldapds dbuser ldap dbpasswd ldap subtree_cond "ldap_entries.dn LIKE CONCAT('%',?)" insentry_stmt "INSERT INTO ldap_entries (dn,oc_map_id,parent,keyval) VALUES (?,?,?,?)" has_ldapinfo_dn_ru no #cachesize 0