I have this issue.
I have a LAN (Windows Server 2008) with Windows 7 Professional computers. We are trying to connect 6 of our computers to a remote VPN.
I have a Juniper ScreenOS 6.2.0r6.0 firewall. VPN section has not been configured at all.
Only one computer is able to connect to the VPN. No simultaneous connection are allowed. Basically the second computer would kick off the previous one connected. Once the "kicked off" computer gets disconnected, when retrying to reconnect, it would give an error
Connecting to vpn.xxxxxxx.com using "WAN Miniport (L2TP)...
Error 800: The Remote Connection was not made because the attempted VPN tunnels failed.
Sometimes i would get also,
Error 619: A Connection to the remote computer could not be established so the port used for this connection was closed.
I've been googling up and down and there is not a clear solution to this. Even here in EX-EX i couldnt find a solution to my problem.
I checked the firewall and our policies does not restrict that port or service. Before we set up NEW everything (Servers, Firewalls and Desktop PCs) we were able to communicate perfectly fine. So if the issue is still the firewall, it has to do with allowing multiple connections thru the same service/port/whatever.
Another interesting fact is that if one of this users connects from home, it would not have any issues and it wouldnt kick off the one connected from inside.
One more thing. Our intranet IP schema changed from 192.168..... to 10.10..... it might be a chance that the rule that they created for our previous IP schema (if they had one) is not being applied to our new schema anymore.
Anyone has been in my shoes before.