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VPN now fails ESP packets

Hi, I have had a site that has had a VPN up and running for over a year now things were good until today, The site said they were having intermittent connectivity issues, pings were working but dropping a few. Testing the outside interfaces were OK no packet loss just over the vpn. The main site has an asa 5505 with VPNs to 3 other sites all OK been that way for over a year, login to the remote site and I am now getting .

IPSEC: Received an ESP packet (SPI= 0xXXXX, sequence number= 0xXX) from x.x.x.x (user= x.x.x.x) to outside_interface that failed authentication.

Of course I have rebooted both ASAs and checked all the settings and still get it about 15% of the packets are lost.

I am not sure why this had started all of a sudden, according to the site the Internet was down for a while and I am wondering what could be going on to do this other than some kind of packet mangling, there basically on the same subnet, both sites are from the same provider and on a /23 network so there should be no reason for something like that to happen, just looking for somewhere to look before I jump the ISP.

Thanks

Jarrid Graham

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