Recently I was stuck with one problem in linux configuration. I wanted to rsh to one machine A from other machine B but I was continuously getting “rcmd socket permission denied” error.
Command was : rsh bbb.bbb.bbb.bbb –l username
aaa.aaa.aaa.aaa is IP address of local machine
bbb.bbb.bbb.bbb is IP address of remote machine
This are the steps I performed to solve the problem after lots of googling.
1) Open the .rhosts file on remote machine B for the ‘username’ and add this line.
aaa.aaa.aaa.aaa username
+ root
2) Open the /etc/hosts.equiv file on remote machine B and add this line.
aaa.aaa.aaa.aaa username
+ root
3) Open /etc/pam.d/rsh file and added “promiscuous” to pam_rhosts_auth.so
auth required pam_rhosts_auth.so promiscuous
4) Add rsh in to /etc/securetty file
5) Permissions and ownership of .rhosts file is changed to eligible one.
6) Run ‘which rsh’ to find out which rsh is used. Suppose it /usr/bin/rsh. Then change permission of /usr/bin/rsh by ‘chmod 4755 /usr/bin/rsh’
After performing these steps I was able to run rsh command on remote machine.