Can you use VNC in your home computer to your boss-office computer?
Can your boss-home computer ping your office firewall?
Check your boss-home PC for any software internet firewall enable.
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Can't configure 3com firewall for port forwarding
Hi,
At the office, we have a quite simple network:
- DSL modem =>3com OfficeConnect Internet Firewall =>switch
My boss asked me to configure the network so that he can take over his office-pc from home.
So I started by installing RealVNC on some PC's on the LAN.
This is working properly. I can take control of the PC's from any LAN-PC.
Now I have to configure the router to forward an incoming connection on port 5900 to the local IP-adress of my bosses PC. On most "home"-routers this is easy to do (Virtual server).
The router/firewall from 3com doesn't have this easy configuration.
It has "Services" and "Policie rules" that you need to configure.
So I :
- created a new service and configured it as :
- Name : "VNC"
- Type : TCP
- Port : 5900
In the 'services' window then , I've set these extra settings for this service :
- Lan out : true
- lan in : true
- Public lan server : local IP of my bosses PC
Then automatically a 'policy rule' apeared in the policie rules window:
I've changed it a bit to :
Allow service 'VNC' from * (wan+lan) to lan on 'Ip adress of my boss'
Then I restarted the router.
But no luck. I keep getting 'Remote host refused connection'.
I don't know why I can't get through.
- It has nothing to do with 'outgoing' restrictions because from the PC's in the LAN, we can take over my PC at home.
- I've tried configuring and connecting on other TCP ports (e.g. 8080, doesn't work neither).
- I am sure that my WAN-IP is corrected because when I set the router to block Pings, this works. If i then disable the 'block ping of death" option, I can ping to it.
- There are some options on the firewall for "DMZ" but this is an extra connector on the router itself, and my bosses pc is not connected to this DMZ connector.
- I also don't want to use VPN, because this is a paying feature for these firewalls.
Any ideas anybody?
Btw, the manual of this firewall :
http://support.3com.com/in
Thanx !!!!!
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Answers
RTFM ;-)
If you read the manual there is 2 ways to do this if you dare
1 is to connect the devices you want access from the internet to the dmz (I would not do this)
2 is to setup a one to one NAT Range (this is also an older methodology) This from the best I can ascertain from the manual requires additional public IP's, although it looks to be doable for one IP
once you create this one to one NAT (one public IP to on Private IP) then you will have to apply the correct filter for this range to allow VNC port to communicate
then you will need to apply the rules and services you created to the IP range.
Time to reccomend a better firewall this one is discontinued from the manufacturer and there has not been any updates for it since 1999.
One more thing:
If you can use VNC in your home to your boss-office computer, your 3Com setting is correct.
The only thing that will tigger this problem are:
1. Boss-home computer software firewall is blocking the traffic.
2. Boss-home computer has some kind on software VPN running. Example: SafeNet Client and Cisco VPN Client.
3. Your boss miss type your office WAN IP Address.
4. Your boss home-WAN IP address is in the same SUBNET as your office WAN IP address.
Hi,
First of all, it has nothing to do with the configuration of the home-PC's. I've tried to connect from my home PC to the office, and no luck. I can take over other PC's on the net from my home PC.
The IP adress that I enter in VNC is correct (WAN adress of router).
So you guys recommend that I use one-to-one NAT. But if I then configure all the filters correctly, will my bosses pc still be protected? I mean, port 5900 is the only one that may be open to this pc.
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by: Wireless-JesterPosted on 2005-01-09 at 14:49:39ID: 12998854
You may want to try enabling udp 5900 as well -- I cant remeber if vnc uses this for communication or not