Cannot connect to VM with NAT through Win firewall

guillem2011
guillem2011 used Ask the Experts™
on
Hi,

I installed Virtualbox on a windows 2000 host. I set a windows
7 virtual machine. Everyting went fine. I also installed a Remote
PC listening software to remotely manage my VM.

My VM is connected through NAT.

The problem is that I cannot connect to the Remote PC software
 when the windows Firewall is activated. When the firewall is
inactive the connection to the remote control software installed
on the VM works perfectly.

I set a rule on my firewall that allows all incoming connections
 to this port to the machine.

I've been browsing and it seems that Windows firewall makes
something weird when it's about NAT but I don't see a solution

thanks
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Top Expert 2012

Commented:
What remote software are you using? Some softwares require and output port to be opened as well

Author

Commented:
I tried with Remote administrator and RealVNC. With both the problem is the same. It only works when win firewall is off. I don't think it's a problem of the remote software.

I suppose that the solution should come on how to correctly set the firewall rules. All outbound ports are open except "File and sharing". I tried to disable the rules that block outbound "File and sharing" without success.
Top Expert 2012

Commented:
Here is VNC

http://kb.realvnc.com/questions/39/How+do+I+allow+VNC+through+my+firewall%3F

Why don't you use something like logmein.com this uses port 80 and it is free
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Author

Commented:
I follow these settings and they work when firewall is off. THe problem is more complex: THe remote software is installed on the WM and is accepting incoming requests from NAT. NAT works when the firewall is off.

I suspect the problem may happen with any software installed on the VM that receives requests from outside through the firewall with NAT. Swithching to another remote control soft won't avoid future troubles with other software that follow the same path.

On the other side, my host is a server that needs port 80 for http. I'm also looking for safe remote control software with full encryption and Remote Admin and VNC have this feature.

I insist, I think the problem is not the software, is the firewall.
Top Expert 2012

Commented:
What I'm saying is logmein is the best software with the most security.

The software will not conflict with any other software using port 80

https://secure.logmein.com/welcome/access/fasteasy/16/?wt.srch=1&utpk=free%20LogMeIn&destination=/welcome/access/fasteasy/16/&originid=51123&ef_id=UbtOCgTIQVMAAAlb:20110906150235:s

Author

Commented:
Yes but this doesn't solve the main problem.

As I told you: "suspect the problem may happen with any software installed on the VM that receives requests from outside through the firewall with NAT. Swithching to another remote control soft won't avoid future troubles with other software that follow the same path."

and: "On the other side, my host is a server that needs port 80 for http."

Author

Commented:
Let's motivate a little bit. I increase 50
Top Expert 2012

Commented:
Ok.

Again "On the other side, my host is a server that needs port 80 for http." that doesn't matter with logmein this will still work without issues.

Logmein doesn't need firewall ports to be opened.  So, the below will not matter as well

As I told you: "suspect the problem may happen with any software installed on the VM that receives requests from outside through the firewall with NAT. Swithching to another remote control soft won't avoid future troubles with other software that follow the same path."
Top Expert 2012

Commented:
Back to the original issues you are trying to connect remotely through a router to this server or internally through a NAT address setup on VirtualBox?

Author

Commented:
Remotely through an internet connection. I connect to the host with the same remote control soft and it works.

From outside, the connection goes through NAT to the VM.

Internally there is no problem, I don't need any remote control soft I just do it from the virtualbox console.
Top Expert 2012

Commented:
From outside you can not connect, right? But when Windows firewall is turned off you can connect, right? But you can connect internally no matter what to this server with the same software without any issues

Author

Commented:
Two first questions a right. This is exactly what happens.

When you say "internally" what you mean?. Trying to connect to the VM from the Host? I don't need any remote desktop soft to do it internally. Virtualbox has a management console and I connect to the  VM through it.
Top Expert 2012

Commented:
From another computer on the servers LAN. Do you have NAT setup within Virtual Box

Author

Commented:
No. I have a VIsta pc. What you mean? To install VB and try to set a VM?
Top Expert 2012

Commented:
No try to connect to the VM from within the same internal network the VM is on with one of the remote softwares.

Author

Commented:
Done. I connected from a PC between the external firewall and the host. The result is exactly the same. Only works with windows firewall off on the host.

Permanently disabling windows firewall is not an option. External and internal firewall rules are different and specific.

Author

Commented:
100 extra points
Problem solved.

It was just necessary to create a new rule on windows firewall for a specific port to allow all connections and allowing edge transversal

thanks

Author

Commented:
I found it googling

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