A transactional server is configured to receive a transactional procedure call from a client to initiate one or more transaction processes. Said transactional server includes a Lightweight Directory Access Protocol (LDAP) authentication server which is configured to forward the transactional procedure call from the transactional server to a distributed authentication server for authentication. When the transactional procedure call to initiate a transaction is received at the transactional server, the LDAP authentication server identifies a user associated with the transactional procedure call, determines that the distributed authentication server should authenticate the user, and initiates an LDAP session between the transactional server and the distributed authentication server. Then, after receiving from the distributed authentication server corresponding user information, the LDAP authentication server creates a token reflecting an authentication result based on the corresponding user security information, which is subsequently used to authenticate the client to participate in the transaction.