Thread: Contivity VPN connectivity issue | Unable to complete encryption handshake

Hi All,

I'm facing the classic problem of not getting through VPN connection. I have dna-a211-1 modem. Tried adding Ports (500 UDP, 50-51 TCP UDP) in the NAT settings, all possible resolution which came out of google, but nothing works.

The error which I get is:

| Isakmpd | E | Unable to complete encryption handshake with remote side. Encryption Mismatch.


Any help will be highly appreciated.

Please check your settings.
Configuring the Nortel Contivity VPN Client for Windows - UBC Information Technology

Post screen shot of the NAT settings as link
hxxp://xx.tinypic.com/xxxxxxx.jpg ( instead of http)

2. what is the encryption selected in Modem/router?

Im attaching the images of NAT and security settings. I have removed ports 50,51 because they didn't make any difference. I'm so tired, please help me resolving the issue. I must be doing something stupid.

Thanks a ton in advance

Quick options:

1.
Try to connect in LAN mode. Not WIFI.
2
So many entries for your VPN connection ?
Delete and keep ONLY one.
3.
Your VPN IP address and port are confidential.

Check whether the port/s you have listed are open .
http://www.canyouseeme.org/

4.
Also ensure all are checked in this page.
http://i6.tinypic.com/6ur7rd3.jpg

5. Start RUN type cmd
type ping www.xxxxxx. com or net your VPN address.

Feedback.

you dont need to open any port to connect to a VPN server.. ( AFAIK) i have a feeling its a problem with your settings.. ask your network administrator regarding the settings, your encryption method in your vpn software is different from what the server is expecting.