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Connecting to another PC over the internet


Connecting to another PC over the internet

I am trying to connect to my sisters PC in Canada using VNC but to no avail. Both ends are on ADSL. Both connections to the internet are active - ie browsing works. However when I tracert to here IP address I get the result shown below.

Now for my questions.

1. Is it possible that VNC would ever work with a tracert as shown?
2. Is there any other troubleshooting tool that would better help identify the problem here?
3. What are the chances that her ISP have blocked ICMP thus preventing Ping and tracert from working as intended?


tracert -w 1000 <her IP address>

1 * * * Request timed out.
2 10 ms 20 ms 20 ms []
3 20 ms 10 ms 20 ms []
4 10 ms 20 ms 20 ms
5 10 ms 20 ms 20 ms []

6 80 ms 90 ms 81 ms []
7 80 ms 80 ms 90 ms []

8 90 ms 90 ms 80 ms []
9 150 ms 160 ms 150 ms []
10 160 ms 150 ms 150 ms []
11 161 ms 150 ms 150 ms []
12 151 ms 150 ms 150 ms []
13 160 ms 151 ms 160 ms []
14 150 ms 161 ms 160 ms []
15 150 ms 160 ms 151 ms []
16 160 ms 150 ms 151 ms []
17 160 ms 150 ms 150 ms
18 * * * Request timed out.
19 * * * Request timed out.
20 * * * Request timed out.
21 * * * Request timed out.
22 * * * Request timed out.
23 * * * Request timed out.
24 * * * Request timed out.
25 * * * Request timed out.
26 * * * Request timed out.
27 * * * Request timed out.
28 * * * Request timed out.
29 * * * Request timed out.
30 * * * Request timed out.

Connecting to another PC over the internet

Whats the error that you are geting? is it a time out? or a connection refused?

The tracert is odd, as no main routers should block them, and as suck i would think it is just bad routing that you have stumbled along and the packets are reaching the end of the time to live (TTL) before hitting the next router. Try increasing the TTL and decreasing the packet size (within the ping command) to see if you can reach her box.

Also try an FTPd // Telnet D and see ifyou can connect to these, as they are not bw heavy.
Community Veteran
Posts: 4,729
Registered: 04-04-2007

Connecting to another PC over the internet

Is your sister running a fire wall that is set to block ping requests?

Also if she has a router connection to the internet, you will need to setup port forwarding, for VNC to work.


Connecting to another PC over the internet

Thanks all. She does have zonealarm installed and uses a usb ADSL modem but no separate firewall. We are fairly sure zonealarm is off at present as it is apparently not showing in the task bar. Awaiting confirmation from task manager.

Try increasing the TTL and decreasing the packet size (within the ping command) to see if you can reach her box.

I did tracert -w 1000 and -w 10000 to no avail. Is this the same as TTL or something different ?


Connecting to another PC over the internet

basicaly, however try this :

ping -l 5 -i 255 -w 10000 HOST

(small size, large TTL, large time out)


VNC Connections


You must have ZoneAlarm allow permissions for both an out bound connections & Inbound connections for VNC. DONT TURN OFF ZoneAlarm you need it still running but just allow VNC the correct permissions, so that ZA acts as a clear pane of glass allowing light through as it were.

If you look at the trace route posted above (I'm not looking at TTL or packet size), the connection struggles at step 1 (times out) so thats an issue itself and might be firewall related but its hard to know with bing in front of the machine and seing how VNC behaves. The traceroute never makes it to the destination IP address (your sisters machine I take it?) as it times out again.

The fact that the connection fails at HOP COUNT 18 at "" suggests its a problem with an intermediary router or internet gateway between networks this is NOTHING to do with your machine or VNC.

**Isnt VNC (if my memory serves me?) supposed to be setup as a) one machine is the server and b) one machine the client and so you have to decide which machine will act as the server and which the client? Have you done this? Have you checked that VNC can and does work with ADSL broadband connections as I have a feeling it was written in dialup connection times (just a thought), NOT all remote dialup connection software is capable of working with broadband connections.

**Which version of VNC are you working with?


F9 FOL Forum Moderator
F9 Broadband Premier 2MB User

Connecting to another PC over the internet

I used to use VNC software to view my fathers computer but leaving a port open was a bit of a security issue. Have since found, get your sister to download the free software and you can have remote access via a web browser and it is completely secure