I tried with the 0.62 version and also got "Killed by signal 1.". Noticed that if a single command for system, capture or capture2, I don't get the error. But will get error when I run $ssh->system({tty=>1},@cmd) more than one time against same host. "Killed by signal 1." will happen on the last $ssh->system(@cmd) or capture(@cmd) or capture2(@cmd)