Site-to-Site VPN not working. Both sides see aren't seeing return traffic. Capture shows dropped ESP traffic

[jomar050485]

Weird problem here. I have a Site-to-Site VPN that isn't working. Both ASAs have other Site-To-Site VPNs working on them. I know the configuration is correct because it was working fine for months and it hasn't changed.

I have both a successful Phase 1 and Phase 2 but both sides don't show any return traffic. When I do an ASP drop capture at the HQ, I see it dropping ESP packets from an unknown IP. These packets have to be coming from the remote side though because when I reboot the reboot ASA, the packets stop dropping. As soon as the ASA comes back up, I start seeing the packets drop again.

When I do a capture at the remote side, I see it dropping ESP packets from an unknown IP as well. This side also has a successful Phase 1 and Phase 2 but doesn't see any return traffic either.

Any ides on what might be causing this?

[Philip D'Ath]

Can you post a "show crypto ipsec sa peer xxx" from each end please.

Is there anything sitting between the firewalls that is also doing NAT?  Perhaps a router?

[jomar050485]

Not sure what the deal was. I completely removed the config and pasted it back in and started to work 

Damn you Cisco.

I had already rebooted both devices too.