Hi Alan,
You can try telneting to the port:
> telnet ipaddress portnumber
or netcat to the port:
> nc ipaddress portnumber
or use nmap to see if the port is open:
> nmap -sT -p portnumber ipaddress
all from a machine outside ... you can test those inside to make sure that it
works locally. The first two should connect then do nothing ... you will have
to CTRL+C out of them ... they should not say Connection Refused. nmap will
give you a more verbose output that is self explanitory.
Austin
Alan Dayley wrote:
> I have setup my at home email server for external access on an odd, high
> port number. It has been working well with dynamic DNS from my domain
> provider and everything. Then, it suddenly stopped answering and I can
> get into it, even with the specific IP.
>
> A brief check of all configuration and operation this morning showed
> that all is supposedly well on my end. Is there a way I can tell if my
> ISP is suddenly blocking the ports?
>
> Alan
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