Watchguard IPsec VPN problem between two Firebox III/1000's

We have multiple Firebox III/1000's connected to each other over IPsec VPN's but two sites in paticular are unable to create a successful connection to each other:

Traffic Monitor Site A:

07/01/09 09:22  kernel:  ipsec: make bundle for channel 16, 1 in SA's, 1 out SA's
07/01/09 09:22  iked[142]:  RE-TO x.x.x.x (site B IP) AG-HDR   ISA_SA ISA_KE ISA_NONCE ISA_ID ISA_HASH ISA_VENDORID ISA_VENDORID NAT-D NAT-D
07/01/09 09:22  iked[142]:  Skipping duplicate packet from x.x.x.x (site B IP)
07/01/09 09:22  iked[142]:  Skipping duplicate packet from x.x.x.x (site B IP)
07/01/09 09:22  iked[142]:  RE-TO x.x.x.x (site B IP) AG-HDR   ISA_SA ISA_KE ISA_NONCE ISA_ID ISA_HASH ISA_VENDORID ISA_VENDORID NAT-D NAT-D
07/01/09 09:22  iked[142]:  RE-TO x.x.x.x (site B IP) AG-HDR   ISA_SA ISA_KE ISA_NONCE ISA_ID ISA_HASH ISA_VENDORID ISA_VENDORID NAT-D NAT-D
07/01/09 09:22  iked[142]:  FROM  x.x.x.x (site B IP) AG-HDR   ISA_SA ISA_KE ISA_NONCE ISA_ID ISA_VENDORID ISA_VENDORID ISA_VENDORID ISA_VENDORID
07/01/09 09:22  iked[142]:  TO    x.x.x.x (site B IP) AG-HDR   ISA_SA ISA_KE ISA_NONCE ISA_ID ISA_HASH ISA_VENDORID ISA_VENDORID NAT-D NAT-D
07/01/09 09:22  iked[142]:  CRYPTO ACTIVE after delay
07/01/09 09:22  iked[142]:  Deleting SA: peer        x.x.x.x (site B IP)
07/01/09 09:22  iked[142]:               my_cookie   0003C0DD3C3ECFF3
07/01/09 09:22  iked[142]:               peer_cookie 20BBA8C3A08143F0

Traffic Monitor Site B:

07/01/09 09:35  iked[146]:  RE-TO x.x.x.x (Site A IP) AG-HDR   ISA_SA ISA_KE ISA_NONCE ISA_ID ISA_VENDORID ISA_VENDORID ISA_VENDORID ISA_VENDORID
07/01/09 09:35  iked[146]:  RE-TO x.x.x.x (site A IP) AG-HDR   ISA_SA ISA_KE ISA_NONCE ISA_ID ISA_VENDORID ISA_VENDORID ISA_VENDORID ISA_VENDORID
07/01/09 09:35  iked[146]:  RE-TO x.x.x.x (site A IP) AG-HDR   ISA_SA ISA_KE ISA_NONCE ISA_ID ISA_VENDORID ISA_VENDORID ISA_VENDORID ISA_VENDORID
07/01/09 09:35  iked[146]:  RE-TO x.x.x.x (Site A IP) AG-HDR   ISA_SA ISA_KE ISA_NONCE ISA_ID ISA_VENDORID ISA_VENDORID ISA_VENDORID ISA_VENDORID
07/01/09 09:35  iked[146]:  Deleting SA: peer        x.x.x.x (Site A IP)
07/01/09 09:35  iked[146]:               my_cookie   ECA1718030D19E9F
07/01/09 09:35  iked[146]:               peer_cookie 0000000000000000
07/01/09 09:35  kernel:  ipsec: Acquiring keys for channel 123
07/01/09 09:35  iked[146]:  Acquiring key for channel/policy 123/0
07/01/09 09:35  iked[146]:  TO    x.x.x.x (Site A IP) AG-HDR   ISA_SA ISA_KE ISA_NONCE ISA_ID ISA_VENDORID ISA_VENDORID ISA_VENDORID ISA_VENDORID

any ideas?
RCoTeamAsked:
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aamodtCommented:
Have not worked alot with VPN / IPsec issues. but maybe  the peer_cookie is not set on Site B ?

peer_cookie 0000000000000000

dont know,  seems also you might have communications problems between the links since the site A monitoring shows Duplicate packets and so on, but not that sure. Just an possible explanation..

Cross checked config and setup with those who is working ?

If so it should be a communication issue i think :)

Regards Aamodt
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dpk_walCommented:
AG-HDR   ISA_SA ISA_KE ISA_NONCE ISA_ID

Have you enabled aggressive mode; use main mode instead.

Please update on the software version which you are using also if you are using VPN manager.

Thank you.
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RCoTeamAuthor Commented:
turned out to be a problem with an ISP router on a hop between the sites.
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RCoTeamAuthor Commented:
indeed a communication issue
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