www.wan2.jsda.or.jp may load slowly or does not load at all behind the ProxySG. This site may not be compatible with RFC-1323.
Disabling RFC-1323 should address the problem. Disabling RFC-1323 support can be done through the command line interface (CLI). Please do the following:
ProxySG>enableEnable Password:ProxySG#config tEnter configuration commands, one per line. End with CTRL-Z.ProxySG#(config)tcp-ip no rfc-1323 okProxySG#(config)exitProxySG#