Most likely, the device you're connecting to does not answer in a way that Net::Applicance::Session expects. Most likely, you can make the object output more debugging information through

    $s->set_global_log_at('notice');
[download]

... just like the documentation says.

thanks for your valuable help

Now all are working fine with devices, but again when i trying to execute the command on hp device with the net applicaion session module getting below error Command (show /Systme1) Failed : read timed-out at /usr/local/share/perl/5.18.2/Net/CLI/Interact/Transport/Wrapper/Net_Telnet.pm line 35 but i am able to login the device kindly help thanks in advance. Khirod Naik

The advice I gave you in my reply above still holds. Turn on debugging and find out why your device doesn't answer, or doesn't answer fast enough, and/or how you can increase the timeout of the module waiting for an answer.