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#1: NAT Negotiation Failure Author: Colin747, Location: Northern Ireland, UK

Posted: Wed May 30, 2012 4:33 pm
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Anyone got any idea how to fix this problem?

Have tried this so far:
Logging in/out
Restarting game
Opening ports 27750
Setting MTW2 to allowed status on Firewall
Disabling Firewall
Restarting Router/PC

#2: Re: NAT Negotiation Failure Author: Soulfly, Location: Edinburgh,Scotland

Posted: Wed May 30, 2012 4:41 pm
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when you opened those ports,did you test it with that tool to make sure were 100% open

#3: Re: NAT Negotiation Failure Author: Colin747, Location: Northern Ireland, UK

Posted: Wed May 30, 2012 4:44 pm
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I followed the Microsoft guide on opening ports but the tool did say it was still closed. Also tried a separate online tool but the connection timed out.
Any more detailed way you could put it to open them?

#4: Re: NAT Negotiation Failure Author: Soulfly, Location: Edinburgh,Scotland

Posted: Wed May 30, 2012 4:53 pm
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http://portforward.com/english/routers/port_forwarding/routerindex.htm

for fm i always used the guide for my router and when that tool said open it always worked.

#5: Re: NAT Negotiation Failure Author: Colin747, Location: Northern Ireland, UK

Posted: Wed May 30, 2012 5:10 pm
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Looking at this guide would you say private IP is the router ip?

http://portforward.com/english/routers/port_forwarding/Draytek/Vigor-2700V/Medieval_II_-_Total_War.htm

#6: Re: NAT Negotiation Failure Author: Odini, Location: UK

Posted: Wed May 30, 2012 5:16 pm
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As Soul has hinted, there are normally two firewalls; Hardware-based, located on your cable/ADSL router and Software-based, Windows firewall or equivalent. You also need to be aware of what ports require opening and type; e.g. TCP (Transmission Control Protocol) or UDP (User Datagram Protocol).

1. You'll need to ensure port forwarding is enabled on your hardware-based firewall, this normally involves setting up a new service and then mapping it your computer's IP address* (this is best set to static or DHCP reserved as this may change otherwise messing up your forwarding!).

2. You'll need to add an exception to your software-based firewall. Using Windows Firewall with Advanced security, you'll need to open the mmc (Microsoft Management Console) for this by typing "WF.msc" without quotes in a run prompt. Select Inbound Rules and select New Rule... from the right-hand pane. Work your way through the wizard, opening the required ports.

3. Lastly, NAT (Network Address Translation) or PAT (Port Address Translation) to be precise, has a auto negotiate feature whereas local clients can temporarily request ports to be opened on the hardware-based firewall, this typically has to be enabled. Games often just refer to this as 'NAT Status' whereas routers tend to call this UPnP.

Sorry for the wall of text but was trying to cover most of the basics. If you provide more detail in what you are trying to achieve then I'll probably be able to provide further details. I bet you can't tell that I'm an IT instructor by trade hey?! Wink

*You can use ipconfig /all in a command prompt to view your current IP and means to how it has been obtained.

#7: Re: NAT Negotiation Failure Author: Odini, Location: UK

Posted: Wed May 30, 2012 5:19 pm
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— Colin747 wrote
Looking at this guide would you say private IP is the router ip?

http://portforward.com/english/routers/port_forwarding/Draytek/Vigor-2700V/Medieval_II_-_Total_War.htm

Nope, this is the IP address information received on this port should be forwarded to, e.g. your computer's IP address.

#8: Re: NAT Negotiation Failure Author: Colin747, Location: Northern Ireland, UK

Posted: Wed May 30, 2012 5:22 pm
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Cheers for that. When I run that tool it says that the port is open but it was not able to ping the router.

#9: Re: NAT Negotiation Failure Author: Odini, Location: UK

Posted: Wed May 30, 2012 5:28 pm
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That is a good thing if you're using a web-based tool to check. Ping is part of a protocol called ICMP which work at a lower level than TCP/UDP. Routers for security reason often block ICMP messages from the WAN interface as this allows an attacker to know that IP address exists. If the tool says that the port is open, then it should be open.

You can check locally to see if the port is open by using the "netstat -a" in a command prompt and looking to see if your port is listed as listening.

#10: Re: NAT Negotiation Failure Author: Colin747, Location: Northern Ireland, UK

Posted: Wed May 30, 2012 5:34 pm
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TCP 0.0.0.0.27750 is listed as Listening but the UDP port isn't.

#11: Re: NAT Negotiation Failure Author: Colin747, Location: Northern Ireland, UK

Posted: Wed May 30, 2012 5:37 pm
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In the router there are two menus: Port Redirection and Open Ports, would I need to enter the port numbers in both?

#12: Re: NAT Negotiation Failure Author: Odini, Location: UK

Posted: Wed May 30, 2012 5:41 pm
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Um... depends on your router. Normally they are one and the same, e.g. Open Ports are all the ports that can be open and Port Forwarding are the ports that currently being forwarded based on those opened in Open Ports. With regards to Windows reporting only TCP, if you are using Windows Firewall, you'll need to create two rules; one for TCP and another for UDP.

#13: Re: NAT Negotiation Failure Author: Colin747, Location: Northern Ireland, UK

Posted: Wed May 30, 2012 5:43 pm
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If you're referring to inbound rules in the Windows firewall i've set two rules one for TCP and UDP

#14: Re: NAT Negotiation Failure Author: Odini, Location: UK

Posted: Wed May 30, 2012 5:49 pm
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yes I am, if they are in the policy and listed as active in Monitoring -> Firewall within the WF.msc then it'll be grand. With regards to your hardware-firewall, what model or ISP are you using?

#15: Re: NAT Negotiation Failure Author: Colin747, Location: Northern Ireland, UK

Posted: Wed May 30, 2012 5:53 pm
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Drektek Vigor 2710

#16: Re: NAT Negotiation Failure Author: Odini, Location: UK

Posted: Wed May 30, 2012 5:58 pm
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You'll need the Open Ports option for your router and remove any options from Port Forwarding.

Just so I can clarify, what are you trying to do or resolve?

#17: Re: NAT Negotiation Failure Author: Colin747, Location: Northern Ireland, UK

Posted: Wed May 30, 2012 6:04 pm
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When trying to connect to a multiplayer game in MTW2 it can't connect due to a "NAT Negotiation Failed"

#18: Re: NAT Negotiation Failure Author: Odini, Location: UK

Posted: Wed May 30, 2012 6:10 pm
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Have you tried any of these suggestions?

Suggestions

#19: Re: NAT Negotiation Failure Author: Colin747, Location: Northern Ireland, UK

Posted: Wed May 30, 2012 6:13 pm
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Yea, don't have any P2P programs, no Hamatchi

#20: Re: NAT Negotiation Failure Author: Odini, Location: UK

Posted: Wed May 30, 2012 6:13 pm
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Also, some anti-virus can cause issues. Try temporarily disabling it to see if it is blocking it.

#21: Re: NAT Negotiation Failure Author: Colin747, Location: Northern Ireland, UK

Posted: Wed May 30, 2012 6:15 pm
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Only have the stuff that comes with Windows, made no difference.

#22: Re: NAT Negotiation Failure Author: Odini, Location: UK

Posted: Wed May 30, 2012 6:20 pm
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OK, let's see if your hardware-based firewall is blocking it or windows. Firstly, open the logs for your firewall by logging into it and going to Firewall/Packet Filtering Logs and posting the contents here.

#23: Re: NAT Negotiation Failure Author: Colin747, Location: Northern Ireland, UK

Posted: Wed May 30, 2012 6:29 pm
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From what I can see I need a separate program that came with the router to get logging and as it's not my house I'm staying in I dunno where it would be. Thanks for all the help so far though.

#24: Re: NAT Negotiation Failure Author: Odini, Location: UK

Posted: Wed May 30, 2012 6:30 pm
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No worries, can you come on Teamspeak? It would be quicker than conversing through the forums. I'll talk you through enabling the windows firewall logs so we can see if it is windows blocking it.

#25: Re: NAT Negotiation Failure Author: Freddy,

Posted: Fri Jun 01, 2012 3:12 pm
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I had the same problem with my mtw2 before too, the problem with me was that the virtual network that Hamachi had created on my PC was interrupting the communication between my normal connection so it wouldn't work. Have you checked for any other virtual networks you have?

#26: Re: NAT Negotiation Failure Author: Colin747, Location: Northern Ireland, UK

Posted: Sat Jun 02, 2012 12:40 pm
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What else could be creating a virtual network?

#27: Re: NAT Negotiation Failure Author: Death_Merchant,

Posted: Sat Jun 02, 2012 9:07 pm
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Just a heads up, i had the same issue and managed to fix it by enabling upnp on my router and forcing medieval 2 to use my private ip address

You can configure this in medieval2preference.cfg located in the root of the medieval 2 folder i.e (c:\program files\sega\medieval 2 total war)

there should lines in the config file as below

[network]
use_ip =
use_port = 27750

put your private ip in there (the one that you get when you type ipconfig in command line)

save the file and make it read only, as medieval2 will attempt to re-write this file when it loads.

#28: Re: NAT Negotiation Failure Author: Freddy,

Posted: Sun Jun 17, 2012 4:29 pm
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bah, now i'm having problems. whenever i play a game with more than 2 people in it i connect fine to the lobby but when i finish loading it just hangs there and it says i have connection problems, i have uninstalled hamachi and i have no other virtual networks running on my machine, i've tried what everyone else suggested, i've resetted my router dozens of times, i just don't know what to do anymore, please help!!

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