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Old 04-29-2007, 10:51 PM   #1
Registered: May 2006
Location: North-Central California
Distribution: Debian Lenny
Posts: 154

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Question VNC, time-outs, and ports?

VNC viewer times out when attempting to contact a VNC server on a remote system. Remote ISP-- and maybe local ISP, too-- seems to be in the way.

Would like to remotely administer the Etch system I just built for my mom, who's elderly and lives too far away to just pop over to tweak something. I also have Etch on my end.

We're both behind NAT firewalls (NetGear routers). Her box is the only one behind the router on her end; my box is one of three behind the router on this end. I set her router to forward 5800.

However, when I tell my VNC viewer to contact 75.80.XX.XXX:5800, the attempt times out, apparently because port 5800 is blocked or filtered by her ISP (if I correctly read the nmap output-- posted below).

My ISP may be in the way, too. Running nmap on my IP indicates *all* ports on the default gateway are "filtered".


1. configure remote router to forward one of the ports shown as "open" on the remote ISP by nmap?

2. any port configuration necessary on local router?

3. is local ISP port filtering a problem? if so, how to get around it? might the VNC browser-viewer option do this?

3. once the ports issue is settled, what is the right syntax for the VNC viewer request?

4. am I asking the right questions?!?

best regards and thanks!

-- bezdomny

Starting nmap 3.81 ( ) at 2007-04-23 09:29 PDT
Interesting ports on (75.80.XX.XXX):
(The 1599 ports scanned but not shown below are in state: filtered)
56/tcp open xns-auth
80/tcp closed http
82/tcp open xfer
91/tcp open mit-dov
115/tcp open sftp
167/tcp open namp
220/tcp open imap3
227/tcp open unknown
237/tcp open unknown
252/tcp open unknown
266/tcp open unknown
290/tcp open unknown
322/tcp open unknown
346/tcp open zserv
351/tcp open matip-type-b
355/tcp open datex-asn
379/tcp open is99c
423/tcp open opc-job-start
460/tcp open skronk
464/tcp open kpasswd5
486/tcp open sstats
620/tcp open unknown
637/tcp open lanserver
640/tcp open unknown
671/tcp open unknown
705/tcp open unknown
719/tcp open unknown
736/tcp open unknown
796/tcp open unknown
865/tcp open unknown
866/tcp open unknown
875/tcp open unknown
880/tcp open unknown
925/tcp open unknown
938/tcp open unknown
954/tcp open unknown
965/tcp open unknown
978/tcp open unknown
985/tcp open unknown
988/tcp open unknown
999/tcp open garcon
1031/tcp open iad2
1127/tcp open supfiledbg
1362/tcp open timeflies
1371/tcp open fc-cli
1388/tcp open objective-dbc
1396/tcp open dvl-activemail
1406/tcp open netlabs-lm
1415/tcp open dbstar
1432/tcp open blueberry-lm
1444/tcp open marcam-lm
1450/tcp open dwf
1470/tcp open uaiact
1488/tcp open docstor
1522/tcp open rna-lm
1651/tcp open shiva_confsrvr
2032/tcp open blackboard
2500/tcp open rtsserv
4000/tcp open remoteanything
6141/tcp open meta-corp
6346/tcp open gnutella
7004/tcp open afs3-kaserver
7070/tcp open realserver
27006/tcp open flexlm6

Nmap finished: 1 IP address (1 host up) scanned in 1149.324 seconds
Old 04-30-2007, 12:02 AM   #2
LQ Guru
Registered: Nov 2004
Location: San Jose, CA
Distribution: Ubuntu
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That is a LOT of open ports. Are you certain you're hitting the right IP? I'm wondering if her ISP is doing some weird DMZ/NAT configuration at their level.
Your local router should not need any special configuration. It's possible her ISP is filtering ports, but it's rare for ports over 1024 to be filtered.
Old 05-01-2007, 06:24 AM   #3
Registered: May 2006
Location: North-Central California
Distribution: Debian Lenny
Posts: 154

Original Poster
Rep: Reputation: 30
Thanks. I'll contact her and check to make sure I've got the right port forwarded and go from there. Thanks again.


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