Disclaimer: The following is a highly technical hint.Summary: This hint is for Network Engineers who want their firewalls to accept VPN connections from standard OS X L2TP / IPSec clients (should also work for Windows and Linux clients). If you are not a network engineer, but are having trouble connecting to one of these devices, you can also forward this tip to your company's 'firewall person,' so that they can fix it.Problem: A Cisco ASA or PIX firewall can be a VPN server, but a basic VPN configuration will not allow the default OS X L2TP/IPSec client to connect, even though the Cisco client will.

1. Cisco Anyconnect Os X

It may not be convenient to distribute the Cisco VPN clients, or your users may not wish to use them.Solution:Step 1: First use the Cisco documentation to setup the VPN on the ASA or PIX. Make sure it works as desired with the Cisco client first.Step 2: DefaultRAGroupIn Panther, and on Windows 2k/XP, the VPN client does not allow the user to specify which tunnel group they belong to, so use the DefaultRAGroup to setup all your VPN rules instead of a custom named group. By default, any client not specifying a group goes into DefaultRAGroup. Tiger allows you to specify a group.Step 3: 3des, sha, group2I tried to use aes encryption, but it didn't seem like OS X likes that type, so make sure you use 3des encryption, sha, and Diffie Hellman group2. On an ASA 5520 with 8.0 code, it looks like the following: crypto isakmp policy 10 authentication pre-share encryption 3des hash sha group 2 lifetime 86400Step 4: transform set mode should be transportYou have to set the transform set mode to 'transport' to work with OS X (or Windows).

Cisco Anyconnect Os X

It looks like the following on my box: crypto ipsec transform-set VPNTRANS mode transportStep 5: mschap passwordsI was not using an Authentication server in my setup, instead creating user accounts on the ASA to use for authentication. If you do this, the password has to be of type mschap, or the authentication will fail.

Note: After you set the password, it will show up as nt-encrypted in the config, but it is really mschap. The line you enter for the user should be something like: username thisuser password thatpassword mschapStep 6: Client configurationOn OS X: Open Internet Connect, File - New Connection - L2TP over IPSec. Click drop-down box by Configuration - Edit Configurations. Enter Description, Server IP, Account Name, Password, and Shared Secret, Group Name (if you didn't use DefaultRAGroup), then click OK. You can optionally click Connect - Options - uncheck 'Send all traffic over VPN connection', click OK.If you leave that last item checked, it will try to send all your internet traffic over the VPN.

Unchecked, it only sends traffic destined for the VPN addresses over the VPN and the rest goes out your normal Internet connection. I set this up several months ago on the Cisco ASA 5510 at the company I work for, and it works, with one caviat: if you are connecting from a nat'd computer (most home networks) the connection will disconnect after 45 minutes, i.e.

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When it attempts to re-key. I have been in touch with both Cisco and Apple tech support about this, but have yet to find a solution. Cisco says it is a problem with the Apple client, and Apple says they are aware of it, but don't have a fix and aren't likely to any time soon. It can get annoying if trying to do extended VPN sessions. If anyone knows of a work around, I would be glad to hear it!-iMac FP 17' 800MHz OS X 10.4.x.

Network admins beware: If you are allowing access to your network using IPSec then you should make sure you understand the risks associated with any configuration you enable.IKE typically has two well-supported ways of negotiating a phase-1 security association: certificates and preshared keys. The rub is that both ends of the connection must use the same mechanism. The server can't present a cert while the client presents a PSK.Since the phase-1 SA always happens first and is used to protect the rest of the session, it is important to understand that:. In certificate-based IKE phase-1 exchanges, the client can authenticate the server based on the FQDN of the server in the CN of the server's cert before continuing. In PSK-based IKE phase-1 exchanges, the client can only be sure that the other end knows the same PSK (a.k.a. A bit off-topic:My employer, no matter how often I bugged them, refused to allow IPSEC access to our Cisco VPN any way other than the official Cisco client because a.) they didn't like the security risks and b.) they didn't want to be forced to support anything other than the official client.If, like me, you despise how clunky, ugly, and intrusive the Cisco GUI is, I highly recommend. It's a GUI front-end that replaces Cisco's GUI, resides in your menu bar, and uses the Cisco-supplied command-line tool.For me, this was just as good as using the built-in OS X client, as my only complaint was I wanted something a bit more integrated.

You do still need to install the full Cisco VPN package and delete the Cisco VPN Client afterwards; I'm not sure why, but it took me a while to figure out!.