i have started cassandra server, before have changed "rpc_address" in cassandra.yaml.i can access cassandra same machine not access cassandra remote machine through java application using hector client. please me, in advance.
i ping machine. not access machine using telnet in windows. servers linux machine. have idea ?
your firewall blocking off telnet port , rest of ports cassandra needs. need add exception telling firewall open port 9160 (the client port). 9160 port need have open unless want remote jmx management etc.
to add exception linux firewall:
iptables -i input -p tcp --dport 9160 --syn -j accept and if want save state:
service iptables save 
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