The remote host may give an attacker information useful for future attacks.
The remote host is running a version of Lotus Domino Server that is prone to several information disclosure vulnerabilities. Specifically, users' password hashes and other data are included in hidden fields in the public address book 'names.nsf' that is readable by default by all users. Moreover, Domino does not use a 'salt' to compute password hashes, which makes it easier to crack passwords.
Upgrade to version 6.5.5, 6.0.6 or higher.