<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=iso-8859-1"> <META content="MSHTML 6.00.6000.16441" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2>hi all,</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>I have installed nagios and its working ok. There are these services which are nttp, http, ssh, mysql and athers whose plugins are installed and check commands configured. However when monitoring the status is unknown and Information status says <FONT face="Times New Roman" size=3>Usage:check_udp -H host -p port [-w <WARNING time>] [-c <CRITICAL time>] [-s <SEND string>]. Someone please help me fix this problem.</FONT></FONT></DIV> <DIV>Thanks </DIV></BODY></HTML>