I am monitoring the performance of the unix server while running 150Vusers. The UNIX Resources graph was showing good results. Suddenly all the graph disappears and showed the following error message

Monitor name :UNIX Resources. Internal rpc error (error code:2). Machine: Hint: Check that RPC on this machine is up and running. Check that rstat daemon on this machine is up and running (use rpcinfo utility for this verification). Details: RPC: RPC call failed.
RPC-TCP: recv()/recvfrom() failed.
RPC-TCP: Timeout reached. (entry point: Factory::CollectData). [MsgId: MMSG-47197]

I have checked the rstat daemon is up and running. I believe it is due to the time setting of RCP.
Can you please let me know how can increase the time of RPC connection?