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On the ASA, try allowing UDP 500 through to the PIX public address as well.
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On the ASA, try allowing UDP 500 through to the PIX public address as well.

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Yeah i forgot to say i allowed ISAKMP also. 
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Yeah i forgot to say i allowed ISAKMP also.

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PIX 506e VPN end point behind ASA 5510. <br />
I have a third party VPN server and a PIX 506e that are going to have a site to site connection. The third party is called a Junxion box and has very limited settings. I have had the Junxion and the PIX Site to Site setup and working with no problems. This is when I add my public IP to the PIX. <br />
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The problem is my pix needs to be behind the ASA 5510. As soon as put it behind the ASA it stops working. I have A static nat from external ip to interal ip of the PIX. I have AH, ESP, and 4500 open on the firwall pointing to the external address of the PIX. &nbsp;<br />
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I can see the other box workin on phase one but never finishing. I think it might be the NAT from the ASA to the PIX 
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PIX 506e VPN end point behind ASA 5510. 
I have a third party VPN server and a PIX 506e that are going to have a site to site connection. The third party is called a Junxion box and has very limited settings. I have had the Junxion and the PIX Site to Site setup and working with no problems. This is when I add my public IP to the PIX. 

The problem is my pix needs to be behind the ASA 5510. As soon as put it behind the ASA it stops working. I have A static nat from external ip to interal ip of the PIX. I have AH, ESP, and 4500 open on the firwall pointing to the external address of the PIX.  

I can see the other box workin on phase one but never finishing. I think it might be the NAT from the ASA to the PIX 

PIX 506e VPN end point behind ASA 5510.

Cisco PIX is a dedicated hardware firewall appliance; the Cisco Adaptive Security Appliance (ASA) is a firewall and anti-malware security appliance that provides unified threat management and protection the PIX does not. Other Cisco devices and systems include routers, switches, storage networking, wireless and the software and hardware for PIX Firewall Manager (PFM), PIX Device Manager (PDM) and Adaptive Security Device Manager (ASDM).

Cisco

A virtual private network (VPN) is a network that uses a public telecommunication infrastructure, such as the Internet, to provide remote offices or travelling users access to a central organizational network securely. VPNs encapsulate data transfers using secure cryptographic methods and other security mechanisms to ensure that only authorized users can access the network and that the data cannot be intercepted.