PPTP VPN not accepting connections

I have a SBS server at one of my customers that rebooted last night to finish some security updates. Now the RRAS VPN will not work. Nothing has changed with the firewall.

When we try to connect we get either error 800 or error 678.

I ran portqry.exe from the box itself and it tells me that 1723 is NOT LISTENING. I don't see how this is possible. RRAS is running and there are no errors in the event logs. I'm looking at the RRAS MMC snap-in and the server is up. I have disabled and recreated the RRAS VPN a few times now using both the SBS wizard and from the MMC snap-in.

All other common ports seem to be fine such as 25, 389, 445, 3389 etc.
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I wonder if somehow the listening port got changed to a different one. Open a command prompt and type the following: "netstat -an|more"

List all the ports that are in state LISTENING and verify if any of them are the correct ones.

Also, what type of security updates did you install?
Check to make sure that the security updates have not blocked port 1723 on server.. See what security updates you installed..
Check your firewall or router and make sure port 1723 is listening.. Turn off windows firewall

Please let me know..
Thanks.. Hardeep
Also, Check this link.. its bit old but i think could be helpful in your case..

08-067 (KB958644) Patch breaks VPN

As i said above, please check for what security patches you installed ..
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jhalscottAuthor Commented:
We only installed the Microsoft security updates listed as critical via Windows Update. There are a few ports that are listening that I don't recognize. There really isn't much happening on this server.

How would I verify if any of these are the correct port that PPTP is now listening on?
Right.. but sometimes updates can break some things as well.. so pls be sure about it

To verify which port is PPTP listening, please go through
Hope this helps.. let me know
To check to see which applications are mapped to a specific port, open up task manager, go to Processes, go to options -> selct columns, and check "PID".

Next open command prompt and type "netstat -anb|more"

Match up the process ID to the port and you will know if the port number has changed
Also, there are utilities like pptpsrv and pptpclnt to verify the same
Also, check the pid in cmd using tasklist /svc & compare in task manager for rras service
Or use a tool > Tcp view
jhalscottAuthor Commented:
I rebooted the server after changing the TCP/IP parameters in the Registry to exclude 1723. I don't know if this did it, but after a reboot the port is listening again.
Ok great.. congra8s then.. make sure your vpn is working and you are good to go..

Also, go through this... just for refrence

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