Its not allow upload the ldif file to LDAP Server
# ldapadd -x -W -D "cn=Admin,dc=linuxoperatingsystem,dc=info" -f /root/base.ldif
Enter LDAP Password:
ldap _sasl_bind(SIMPLE) : Can't contact LDAP server (-1)
The messages says it cannot find the server. Your command does specify the actual server. Perhaps you specified it in one of the OpenLDAP config files, like ~/.ldaprc ?