If you are an UNIX/LINUX administrator then you would have possibly come across or will see quite regularly that DU and Df do not always agree on the size of the filesystem when measured with most of the file systems. In most known scenarios, df will be reporting less available space than the du command.
A Trust relationship can be established for users on multiple servers running OpenSSH to allow a password free ssh session. This is sometime important when you want to run scripts or commands remotely.
Syslog daemon in Solaris by default is enabled for remote logging and will listen on UDP port 514 for syslog messages from remote systems. Unless, the server is acting as a remote logging server, this can be a Security issue as a malicious user can launch a Denial Of Service (DoS) attack on the server.