Thank you sir. I opened port 4321 and it works. There is still a trick, which
took me several hours to find out: 4321 port should be put at the first
position in INPUT chain. If it is appended in INPUT chain, it won't work.
Thanks again for your great help. I appreciate it very much.
Best regards.
Jie Xu
Quoting Max Matveev <makc@xxxxxxx>:
> >>>>> "jxu" == Jie Xu <jxu004@xxxxxxxxxx> writes:
>
> jxu> Yes sir, you are right. I have successfully installed PCP in
> jxu> another node, say compute node B, which can poll head node
> jxu> A. But head node A can not poll compute node B. That means some
> jxu> network services in compute node B is not open. But I can still
> jxu> use ssh and sftp to connect the two nodes. I am not sure what
> jxu> service it is to accept PCP connection request.
>
> It sounds like you need to talk to a person who setup
> iptables/ipchains and ask him/her what port they block and what ports
> they allow through before you try anything else. If they say they did
> something like this, ask them to open port 4321 and it should give you
> your PCP connection.
>
> max
>
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