UC520 VPN Problems

I have a cisco uc520 and 871 that i use to connect to. When i add the remote connection to the 871 and test i get the tunnel status as down. From the uc520 if i type show crypto isakmp sa it shows the remote ip and the state is AG_INIT_EXCH. Im not very expierenced in debuggin this. I tried creating a new vpn pool and that didnt work either. I assume that the firewall would add any rules automatically since its hosting.  Would i need to add nat rules? how could i debug this further. The 871 gives me nothing.
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v46nAsked:
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v46nConnect With a Mentor Author Commented:
i contacted cisco tac and the vpn is resetup and tunnel works now. there was a problem on the host side.
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MikeKaneCommented:
From what I could gather from the description, it sounds like the firewall side does not have a complete config.    Your assumption is not correct, the firewalls will not automatically update any rules, that would be a huge security hole.     Are you the firewall admin?   Can you provide the debug logs showing the connection attempt?
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