My local network does not work since VPN install

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Question:

I have a local network and one of those machines has the Cisco VPN client installed. Now VNC fails to connect to that machine with the VPN client, even if the VPN client is not running. I also notice trouble using ftp to outside sites, again, without being on the VPN.
It seems as if I was behind some firewall but I cannot find any. I turned off the Windows Firewall completely already.

Answer:

The reason is a certain driver that Cisco's VPN client installed on your machine. It is called 'Deterministic Network Enhancer'. This driver is active even if you do not load the VPN client.
You can see it in the control panel, click on 'network connections' and there right-click on your ethernet card.
You could in theory disable or remove this enhancer there and you would instantly be able to VNC into your machine again, however, this requires a reboot and afterwards your VPN won't work anymore.

Luckily there is a solution around.

Start the VPN client
In the tray, right-click on the icon
Uncheck "Stateful Firewall (Always On)

Now your local network will work again. You could even make this change temporarily, e.g. remove the check, VNC into the machine, then add the check again, while your VNC connection remains alive.

Comments:

2006-11-04, 07:15:11

anonymous from Australia

thank you very much, the solution solved my problem too.
Regards, Rhody from Sydney

2006-11-24, 16:24:12

anonymous from United States

Thanks -- solved a mystery here in Phoenix.

2007-05-01, 13:42:56

anonymous from United States

Thanks! Solved a problem of not being able to ping a PC with the Cisco VPN from any other computers on the LAN. Once the checkmark was taken off the Stateful Firewall (always on), I was able to ping it and map drives to the PC.

2007-06-01, 13:41:07

anonymous from United States

Remarkable. Thank You! You solved a problem that has been vexing me for months!! Same issue as those above & your solution worked. Thanks again!

2007-07-01, 12:19:03

anonymous from Amersfoort, Netherlands

Solved my mystery of still getting a eMule low-id after port forwarding, switching modem/router firewall off, upgrading firmware etc. etc.

Thanks

Otto

2007-08-03, 20:21:53

[hidden] from Houston, United States

RETURN CODE 2147023621 DNE DETERMINISTIC NETWORK INHANCER

2007-09-20, 13:11:53

anonymous from United States

Ahhhhh.. thank you so much. It solved all my issues of not being able to receive incoming connections for things like ftp server and bittorrent.

2007-11-04, 22:03:56

anonymous from United States

this is a brilliant answer, 5 stars no doubt of it. I have been borthered with this problem for whole weekend until I see this post, thank you very very much!

I am from Moon, PA 15108, btw.

2008-02-04, 14:05:01

anonymous from United States

Outlook and WinMsg would intermittently lose connection to exg svr. Many thx...

2008-02-08, 19:50:57 (updated: 2008-02-08, 20:00:40)

Billy,Toledo from Cumming, United States

yep, yep, this fixed my connection problem also.
Thanks for finding my needle in the haystack for me!


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