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Connection refused with RealVNC/Tight VNC

Hi!, i got a serious problem that i can't get rid of.  I got a client with 7 computers connected to Internet via a Router. I log in the router to forward some ports to the different computers so that i can get into the computer with VNC/TightVNC. That way, when i enter a no-ip address with the port number to get the computer that i want. Example : myno-ip.info:5900 would go to the computer where i set up vnc server to accpet connections on port 5900 wich is the default one.

Right now, it works on 3 computers, so i have the four other ones wich won't work and i don't know why.  The right port has been open on the XP firewall and on the router but for some computers it just won't work. I get unable to connect to host: connection refused (10061)

the only common thing i would see would be the norton anti-virus, but for some computer with nav installed it work anyway. i'm out of ideas right now.

the example was for one of my client but it's not the only one where i have the problem
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flyers_pat
Asked:
flyers_pat
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1 Solution
 
crissandCommented:
The computer can be contacted but the vnc server not. That means the port is not correct or a firewall is blocking the port.
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flyers_patAuthor Commented:
i know the port is open because i can open the port via telnet but there is no firewall installed that i know of except if the norton anti-virus version that comes with the Acer products has one.
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crissandCommented:
If it's Norton Internet Security it includes a firewall.
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flyers_patAuthor Commented:
the only problem i got with that it's that i can ping the port with telnet, wouldn't norton block the port that way too?
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flyers_patAuthor Commented:
the version is nav 2002

i ping the port that i want in telnet, i can even install remote admin and it will work but not with vnc.
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stevenlewisCommented:
You have different ports pointing to different machines? and have configured vnc to use the different ports (the coresponding ports) when trying to connect?
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flyers_patAuthor Commented:
yes, on the router in the forwarding section, i eneterd the 7 computers starting from

5899-5899 to ip .25
5900-5900 to ip .26
5901-5901 to ip .27
5902-5902 to ip .28
5903-5903 to ip .29
5904-5904 to ip .30
5905-5905 to ip .31

with vnc viewer, i enter mynoip.no-ip.info:5900 to connect to the computer with the ip .26

but like i said it's not working for some of them and it's driving me mad not knowing why


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stevenlewisCommented:
any software firewalls on the machines in question?
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flyers_patAuthor Commented:
none, i can enter via remote admin but not with vnc, the antivirus installed is norton antivirus 2002 shiiped with the Acer computers
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crissandCommented:
VNC server cannot open required port. Try other ports. Look at event logs.
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flyers_patAuthor Commented:
where is that?  i can't see in the version 3.3.7 or 4
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crissandCommented:
Look here:

http://www.realvnc.com/pipermail/vnc-list/2004-November/048115.html

Do you have passwords longer than 8 characters? If yes, try entering only the 8 chars.
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flyers_patAuthor Commented:
i think i just my problem but i'm not sure with remote admin, i checked the programs installed on one of the computers and i saw Norton WMI Update, could it be that it block me with VNC?

While searching on the web i found out that WMI is to help the communication between Norton and Windows SP2 and since i don't have SP2 installed on this computer, is it okay to remove Norton WMI Update?
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cohenphilCommented:
when your setting up your clients are you actually setting the "display number"(port number) to correspond to your port forwarding

5899-5899 to ip .25 CLIENT >WONT WORK - 5800 range is for the HTTP Java Client. shuffle this port mappings to compensate or move it to the end of the list.  This would actually be the Http Java port for a client with Displaynumber 99 so you would actually need to forward TCP/IP  port  5999 to port .25 in your router.

5900-5900 to ip .26 WORKS because is on the default display number eg display number has auto ticked
5901-5901 to ip .27 CLIENT needs display number set to 1
5902-5902 to ip .28 CLIENT needs display number set to 2
5903-5903 to ip .29 CLIENT needs display number set to 3
5904-5904 to ip .30 CLIENT needs display number set to 4
5905-5905 to ip .31 CLIENT needs display number set to 5

Adjust those settings and see how you go.
Let me know

Cheers,
 Phil
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cohenphilCommented:
sorry had a typo in the last line 2nd para

5899-5899 to ip .25 CLIENT >WONT WORK - 5800 range is for the HTTP Java Client. shuffle this port mappings to compensate or move it to the end of the list.  This would actually be the Http Java port for a client with Displaynumber 99 so you would actually need to forward TCP/IP  port  5999 to IP .25 in your router.
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flyers_patAuthor Commented:
yes i know that but with vnc server 4, i can use the port 5899 because you have to enter the whole port not just the display.
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flyers_patAuthor Commented:
the port that is not working is the port 5905, and i tried to change it to 5902 and it wouldn't work both ways
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cohenphilCommented:
If you forward port 5900 to IP .31 (from last post settings)
and set the client with the defaults. Can you connect?
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cohenphilCommented:
Sorry bout v3.3 postings, V4 totally slipped my mind.

When your in v4. are there any access control settings set?
What O/S is this problematic computer running? Can you access this computer from within the LAN

eg VNC to computer that works, open up VNC client on this machine and try and connect to problematic machine from there.
Can you reach it?
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flyers_patAuthor Commented:
i can ping the machine from the network, i can even open the port 5905 in telnet, but with vnc viewer it give me the error 10061, i'll try to connect to a vnc server from this machine later on.
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cohenphilCommented:
Found the below comment in a VNC Newsgroup post it may help you out -
FYI - to reset the TCP/IP stack in XP
open a command prompt and type
NETSH INT IP RESET RESET.LOG  <ENTER>

A minor part of your stack may be corrupt which could be why you can telnet in but not do anything else.


error 10061 indicates that the server computer didn't
even accept the TCP connection in the first place - the connection never got
to the stage of being connected nor authenticated.  This is why there is no
logged connection in the .log file.

Possible causes are:
- Broken TCP stack on the second machine
- Broken DNS setip on the second machine (what form of VNC Viewer address do
you use?)
- A firewall configuration at the server that permits connections only from
certain addresses
- A firewall configuration at the server that permits connections only via
certain network interfaces
- Some sort of firewall software on the second machine, that is aborting the
connection at the source.
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cohenphilCommented:
Wouldnt mind some of those points,

Cheers,
Phil
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