[SunHELP] Inetd blacklist file?

[Bret Adams]

netstat -a will give you what processes are listening on what ports for 
both tcp and udp.

At 10:20 PM 9/23/2003 -0700, you wrote:
>My family mail server is an old Sparcstation 5 with Solaris 8
>(including sendmail) plus qpopper etc. Yesterday inetd began to deny
>access to the qpopper (pop3) port 110 with the message
>
>telnet: Unable to connect to remote host: Connection refused
>
>even though /etc/inetd.conf and /etc/services are unchanged (I checked
>with sum). The entry in /etc/inetd.conf is
>
>pop3 stream tcp nowait.600 root /usr/local/lib/popper qpopper -d -s -c -R
>
>and in /etc/services
>
>pop3            110/tcp            # Post Office Protocol - Version 3
>
>I know that this means that qpopper is never started - if inetd
>started qpopper and qpopper quit, the diagnostic would say "closed"
>rather than "refused".
>
>Restarting inetd or re-booting the server have no effect on this
>response, even though everything else on the server works normally,
>mail is received and forwarded correctly etc.
>
>My best guess is that inetd monitors the return codes of its children,
>and if a child crashes then its port is blocked until the sysadmin
>does something - but what? How does inetd maintain its list of blocked
>ports?
>
>My second-best guess is that some other process has started listening
>to port 110 (so inetd is blocked from this port) without accepting
>connections. How can I find out what processes have opened what ports?
>Is there a shell command that will give me a list? Is there an option
>to inetd for logging the problems encountered in attempting to listen
>on ports?
>
>I would be grateful for help with the above, or for insight on any
>other possible causes of this problem.
>--
>                                 Adam Reed
>                                 areed2 at calstatela.edu
>
>Context matters. Seldom does *anything* have only one cause.
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