sftp connection closes if idle for around 10minutes

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http://www.unix.com – does sftp connection closes by default if it stays idle for a prolonged time ? i have checked sshd_config files , there is no time out value set. but still the connection closes after certain period of time. Please help. verbose mode output : Code: sftp> debug1: channel 0: free: client-session, nchannels 1 debug1: fd 0 clearing O_NONBLOCK Connection to [x.x.x.x] closed by remote host. debug1: Transferred: stdin 0, stdout 0, stderr 53 bytes in 600.6 seconds debug1: Bytes per second: stdin 0.0, stdout 0.0, stderr 0.1 debug1: Exit status -1 (HowTos)