You may hit TNSTNS-03505 Message 3511 error message while you are trying to use tnsping command.Complete error message is: Message 3511 not found; No message file for product=network, facility=TNSTNS-03505: Message 3505 not found; No message file for product=network, facility=TNS You may hit this error while on database machine or machine which only has client installataion. Continue reading