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rsh fails with 'poll: protocol failure in circuit setup'
Problem:
In /var/log/messages on the server: Jun 5 01:55:02 server rshd[12946]: connect second port: No route to host On the client: # rsh server.domain.com 'uname -a' poll: protocol failure in circuit setup
 
Solution:

The secondary tcp connection from server to client is being blocked by a firewall or IP filter. You must allow traffic originating from server:any to client:512-1024. Keep in mind that rsh is considered VERY INSECURE and not to be used outside the confines of a completely secure network.

 
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