Re: Thank you for your help.

[Kevin Wang <kjw@xxxxxxxxxxxxx>]

 From Jie Xu
> 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.

that's normal.  Most firewall rules are evaluated from top to bottom
(or first to last) and the first rule that matches typically exits the
evaluation chain (not always true)

thus, you have to put accept or allowable rules first, and then you have
a global "reject everything" at the end.

> Thanks again for your great help. I appreciate it very much.

Not a problem! glad to help.

   - Kevin