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Thank you for your help.

To: Kevin Wang <kjw@xxxxxxxxxxxxx>
Subject: Thank you for your help.
From: Jie Xu <jxu004@xxxxxxxxxx>
Date: Thu, 12 Feb 2004 22:23:38 -0600
Cc: pcp@xxxxxxxxxxx
In-reply-to: <20040211154647.GA4058@xxxxxxxxxxxxx>
References: <ED373A183611D311A6220060943F134C08784D7B@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> <1076483051.4029d3ebd042b@xxxxxxxxxxxxxxxxxx> <20040211072345.GA2179@xxxxxxxxxxxxx> <1076485786.4029de9a04a88@xxxxxxxxxxxxxxxxxx> <20040211154647.GA4058@xxxxxxxxxxxxx>
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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 Kevin Wang <kjw@xxxxxxxxxxxxx>:

>  From Jie Xu
> > Yes sir, you are right. The ping does not work. I have successfully
> installed
> > PCP in another node, say B, which can poll node A. But node A can not poll
> node
> > B. That means some network services in node B is not open. But I can still
> use
> > ssh and sftp to connect the two nodes. I am not sure what service it is to
> > accept PCP connection request.
> > 
> > Thank you very much for your help. I am really grateful.
> ah, in that case, you must have some sort of firewall between the two
> or network security installed on the machine.
> If linux, it's probably iptables.  "iptables -L -n -v -t filter" or
> "iptables -L -n -v -t nat" will likely show you which machine is blocking
> packets for everything but port 22.  If you can open up port 4321,
> that will allow the pcp server to accept connections from the network.
> Be sure to turn on the appropriate security features of pcp, and/or only
> open port 4321 to your local network, otherwise everyone in the world
> will be able to access your machine.
> 'telnet remote 4321' from the client machine can help verify if the port
> is open or not.
>    - Kevin Wang

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