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Open ports RRAS without NAT function

Posted on 2011-10-03
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Last Modified: 2012-05-12
Hi everyone,

I have a problem with the RWW on my SBS 2003. RRAS is active for the VPN-connections which is its only purpose. NAT is not configured because it only has 1 NIC.
When a client of mine wants to use RWW to take over his desktop at work, he receives the following message you can see in the image. Yesterday when I tried, I got another message: "Connectivity to the remote computer could not be established"
rww error
Port 4125 is forwarded on the router, but I think that the port is not open on the server. I can't access the windows firewall anymore, because IPNAT.sys in running.
I executed the command: netstat -aon | find ":4125" but nothing returned, so I guess that the port is just not open at the server.

I also can't change anything in the RRAS to open these ports. I have read something about NAT/Firewall in IP routing under RRAS, but this is not visible. I think this is because RRAS just provides VPN-access to the users and no NAT.

Any idea how I can fix this problem or open ports under RRAS? I tried to disable RRAS, but lost connection to my server, so used vsphere to enable it back again. RRAS needs to be enabled, because when I tried to access the terminal server, it gave me the message that it can"t find the specified domain when I tried to login.

Thanks!!
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Question by:Silencer001
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by:marcustech
marcustech earned 2000 total points
ID: 36903763
First thing i'd do would be re-run the "connect to the internet" wizard in SBS - either do Start --> Run --> "ICW" or run it from the SBS Management interface. This should configure the remote access and NAT settings correctly.
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Author Comment

by:Silencer001
ID: 36903823
Thanks for the suggestion marcustech. I ran the wizard "Connect to the internet" but still no change.. The port isn't opened.

Do you have some other suggestions that I could try?
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Author Comment

by:Silencer001
ID: 36903919
It still seems that there isn't listening something on port 4125, succesfully completed the wizard + done an iisreset.
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LVL 12

Assisted Solution

by:marcustech
marcustech earned 2000 total points
ID: 36903935
Can you remote desktop to client PCs internally? What about if you browse to the Remote Web Workplace by running internet explorer on the server (log onto server and browse to https://localhost/remote )? Regarding port 4125, this will only be opened "on demand" by SBS when the connect to computer script runs, until then it won't be listening on this port - as long as nothing else has used the port in question, which is what the netstat -aon | find ":4125" is checking for.
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Author Comment

by:Silencer001
ID: 36905190
Ah ok thanks for the clarification! I just tried it marcustech and locally it's no problem. Just connecting from the outside isn't possible..
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Accepted Solution

by:
Silencer001 earned 0 total points
ID: 36905262
OMG, I just checked the router.. My collegue had just added the policy to enable port 4125 over the network (trust to untrust and the other way around). She didn't make a NAT-rule to map the IP-address..

My mistake! Thanks for your suggestions, I have learned from it! Will award point for your trouble! Thanks mate!
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Author Closing Comment

by:Silencer001
ID: 36935279
I just checked the firewall myself and this was the cause.. Port was not forwarded to the SBS-machine.
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Expert Comment

by:marcustech
ID: 36906202
Glad you got it sorted fella.
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