The remote application is prone to denial of service attacks.
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 requests with negative BER lengths. 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 5.0.7 or higher.