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Re: Determine what service listening on port



For the record...telnet is a TCP based client and server.  You can not
connect to a UDP service with a TCP client, such as telnet, in order to
determine anything.

> The -sV option on nmap would give you service version information. You
> might
> also want to try connecting to the ports with telnet to see what they
> might
> show.
>
> On 7/13/07, joseph tacuyan <joseph mailboxlist gmail com> wrote:
>>
>> how about nmapping it?
>>
>> On 7/13/07, redhat buglecreek com <redhat buglecreek com> wrote:
>> >
>> > I have a RHEL ES3 server that has three listening udp ports open.  I'm
>> > having a hard time trying to determine what service opened them up.
>> The
>> > ports are udp 1020,1022,1023.  I have tried to following: "netstat
>> -lp",
>> > the PID/Program name column just shows a -,  "fuser -n udp 1020",
>> > nothing returned, lsof -i :1020. nothing returned.  I have shut down a
>> > few services in an attempt to discover who opened the ports, but no
>> > luck.  Anything I may have forgotten?
>> >
>> > Thanks
>> >
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