For some reason any version of the IPMIView doesn't work with IPMI firmwares >= 3.32, including the last IPMIView one. You have to use the browser launching their Java plugin from a web-interface, and this has to be a specific Java version. This isn't fixed as of 3.43 version (for X10 controller at least), the only difference is that 3.32 version sends RST immidiately after receiving SYN on port tcp/5900, and 3.43 version passes the three-way handshake for tcp/5900 and sends RST 35 seconds afterwards -and that's what Connection failed Java error really means.