Sql Server Advanced Stats

Hi.. I am trialling uptime and have installed the agent on my windows server that runs my SQLServer instance.. I am gathering information on the server from my Agent no problems.. However when I try and gather advanced stats for the SQL instance i either get ;

Status: CRIT
Message: – No stats for this instance
Response time: 422 ms

or if i leave the instance name out i get..

Status: CRIT
Message:
Response time: 16 ms

I'm obviously doing something wrong, can anyone help??

Thanks