The remote application is prone to a denial of service (DoS) attack.
The remote host appears to be running CommuniGate Pro, a commercial email and groupware application. The version of CommuniGate Pro installed on the remote host includes an LDAP server that reportedly fails to handle malformed LDAP requests. A user can leverage this issue to crash not just the LDAP server but also the entire application on the remote host.
Upgrade to version 5.0.8 or higher.