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UC540 VPN trouble

I am trying to get VPN access established on a UC540. The purpose is to support a couple of users with IP Communicator. I have an SSL VPN configured for some of the physical phones (SPA525G2) and it works correctly (or did before I started working on the other VPN). Since IP Communicator can't use the SSL VPN to connect I am using Cisco VPN Client to connect to the UC540 to allow the softphone to register. But so far I have been unable to establish a VPN connection.

When I attempt to connect I get an error on the VPN Client:

Secure VPN Connection terminated by Peer.

Reason 433: (Reason Not Specified by Peer)

The UC540 connects directly to the internet. I am on a private network connecting through NAT.

I have been working with this for far too long already and I feel that I am missing something small in the config.

I have attached the config and logs. I would appreciate any insight that anyone might have.

Everyone's tags (1)

UC540 VPN trouble

I just got off the phone with a Cisco Engineer. He was able to determine the problem.

After a couple of changes to my configuration the tunnel came up without a problem

In case anyone was interested in how this issue was finally resolved. Although I haven't had a chance to check the status of the SSL VPN yet, so I may have to fix that as well.

These are the changes that were made:

no crypto isakmp profile VPN_Profile

crypto isakmp policy 2

encr 3des

authentication pre-share

group 2



UC540 VPN trouble

Update: It would appear that the SSL VPN is working correctly. I am using a SPA525G2 to connect via the SSL VPN without trouble. So after the corrections, my VPNs are working as intended.


Re: UC540 VPN trouble

Hi Paul,

I've read your post and it was very interesting because i've to make a configuration almost like yours, because I don't have the UC connected directly to the internet, but it's by a SA520.

I've checked the configuration that you put here.

It was difficult to configure the SPA525G?

Do you have some documentation of how to configure vpn on the SPA525G?

Best Regards.

Luis M