PE 2950 / RhEL4 : tcp port 686 open ?

Brian A. Seklecki lavalamp at spiritual-machines.org
Fri Jan 12 04:22:34 CST 2007


That's crazy.

You can use "lsof | egrep -i 686" or "sockstat | egrep -i 686" to 
ascertain which process has an emphemeral, unregistered, priviledge port 
open.

If you system doesn't have sockstat, you can probably use fstat(8) since 
sockets are file handlers.

~BAS

On Fri, 12 Jan 2007, Florent Gilain wrote:

> Hi all,
>
> Just a question concerning default ports open on DELL default RHEL4
> installation :
>
> What is this tcp port 686 ? What is it used for and is there a problem to
> close it ?
>
> [root at supervision root]# nmap -v s-oracle-bak
>
> Starting nmap V. 3.00 ( www.insecure.org/nmap/ )
> No tcp,udp, or ICMP scantype specified, assuming SYN Stealth scan. Use -sP
> if you really don't want to portscan (and just want to see what hosts are
> up).
> Host s-oracle-bak.de.lan (10.168.123.16) appears to be up ... good.
> Initiating SYN Stealth Scan against s-oracle-bak.de.lan (10.168.123.16)
> Adding open port 1521/tcp
> Adding open port 32775/tcp
> Adding open port 199/tcp
> Adding open port 5520/tcp
> Adding open port 111/tcp
> Adding open port 686/tcp
> Adding open port 22/tcp
> The SYN Stealth Scan took 16 seconds to scan 1601 ports.
> Interesting ports on s-oracle-bak.de.lan (10.168.123.16):
> (The 1594 ports scanned but not shown below are in state: closed)
> Port       State       Service
> 22/tcp     open        ssh
> 111/tcp    open        sunrpc
> 199/tcp    open        smux
> 686/tcp    open        unknown
> 1521/tcp   open        oracle
> 5520/tcp   open        sdlog
> 32775/tcp  open        sometimes-rpc13
>
> Thanks
>
> Florent
>
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l8*
 	-lava (Brian A. Seklecki - Pittsburgh, PA, USA)
 	       http://www.spiritual-machines.org/

"...from back in the heady days when "helpdesk" meant nothing, "diskquota"
meant everything, and lives could be bought and sold for a couple of pages
of laser printout - and frequently were."



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