We use cookies on our website to ensure we provide you with the best experience on our website. By using our website, you agree to the use of cookies for analytics and personalized content.This website uses cookies. More Information
It seems like your browser didn't download the required fonts. Please revise your security settings and try again.
Barracuda NextGen Firewall X

PPTP or L2TP with Windows Vista / Windows 7 doesn´t work

  • Type: Knowledgebase
  • Date changed: 5 months ago
Solution #00005314 

 
Scope:
This solution replies to:
- NG Firewall firmware versions 4.2.x, 5.0.x, 5.2.x
- netfence firmware versions 4.2.x

 
Symptoms:
No PPTP / L2TP connection to a Barracuda NG Firewall possible with Windows Vista / Windows 7.

 
Solution:
In Windows Vista / Windows 7 there where a few changes concerning the remote access from security perpective. 40/56 bit RC4 encryption is removed by default from Vista / 7 as well as LHS server. This means PPTP/L2TP now only supports 128 bit RC4 encryption by default. So if you VPN server or VPN client doesn?t support 128 bit encryption, you can still get 40/56 bit RC4 back.

If you still want to do get 40/56 bit RC4 crypto back, use the following registry key:

For PPTP:
HKLM\System\CurrentControlSet\Services\Rasman\Parameters\AllowPPTPWeakCrypto and change it to "1". 
 
For L2TP:
HKLM\System\CurrentControlSet\Services\Rasman\Parameters\AllowL2TPWeakCrypto and change it to "1". 


Please restart your machine after that.

 


Link to This Page:
https://campus.barracuda.com/solution/50160000000IKbjAAG