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Sometimes when you restart your ASA 5500, the Easy VPN configuration presents a problem. Even if you save the running configuration to the startup configuration. This is a known issue and there is a fix, but if you just want to Make it Work for now:

• In the web interface, click “Configure,” then “VPN,” then “Easy VPN Remote.”
• If the VPN light isn’t on, it’s not enabled. Check the box to enable it and hit “Apply.”
• You will probably get a dialog telling you about conflicting configuration. Leave it open.
• Open a command prompt and telnet to your ASA 5500. Use the same password as you do to login via the web interface.
• Type enable and hit return. Use the same password.
• Type configure terminal and hit return.
• Type show running-config and hit return.
• Find the lines in your running configuration that are very similar to the ones in the ASDM dialog box.
• For each of those lines in your running configuration, type no ... where … is the line of your running configuration. There might be more lines in your running config than your dialog box.
• Type “write memory” and hit return. Wait for it to finish.
• Go back to the ASDM applet, close the dialog, check “Enable” and hit “Apply” again.

It should work now.