Error In Rsh Connection, poll:protocol failure in circuit set
 

I wanted to setup the rsh service. But there is some problem.
the host name with rsh service is "netking",and the client name is "xxx"

When I input the command "rsh netking ls" in the netking which surpport the service,the work went well . however while I input the same command in the client ,the terminator showed the tips like :
rsh netking ls
poll:protocol failure in circuit set

Now I list the hosts and hosts.equiv in /etc
hosts:
127.0.0.1 netking
211.111.12.63 xxx

hosts.equiv:
netking
xxx

What's wrong with my system?
By the way ,my system is redhat9.0.

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