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ASA - Firewall Issues With Cisco VPN and ASA

Firewalls that are known to cause issues with Cisco VPN, and ASA remote phone solution

Manufacturer: Sonicwall
Model: All Models
Recommended workaround:  Multipile solutions have been tried including putting the ASA in a DMZ, and disabling deep packet inspection.  So far the only known resolution is to bypass the firewall completely by obtaining a static IP from the ISP, and statically addressing the public interface of the ASA5505.  The public port then needs to be patched directly into the customers internet router.  

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