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I am working on a Solaris server which goes to sleep mode if idle for more than 30 min.
What hardware do you have?
What version of Solaris are you running?
What actually happens when it "goes to sleep mode"? Any messages? Any symptoms? Does an external "ping" wake it up?
Do you see the problem while next to server and before you go home?
First guess is that your server hardware BIOS has one or more powersave options set which are powering down parts of the server after 30 minutes.
Server software installed on a PC maybe?