Cisco ASA 5510 Problem to sonicwal pro1260

Hello experts, hope you can help
I have a cisco asa5510 with multiple lan to lan vpn's configured (terminating on a mixture of cisco 837, 877 and pix 501)

I also have a single lan to lan vpn terminating on a sonicwall pro 1260, this vpn does not come up, it fails phase 1,
looking at the logs from the sonicwall i seem to be getting errors "invalid cookie",

Now I have spent the 2 days trying to resolve this issue, I have looked on the web a few people seem to have the same issues, i have chacked my isakmp and ipsec (protected traffic) etc and all looks fine, it is worth mentioning we had a pix 515 before the asa and the sonicwall vpn terminated fine with that then, just no good with asa,

Already logged a call with sonicwall but they can not help, they said it should be working

someone has mentioned a way of disabling aggresive mode on the asa as this might be a problem (even though my tunnel is configured for main mode).... ?

I can provide error logs /configs but not until tomorrow morning,

Thanks guys
Andy

webleyaxsorAsked:
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MikeKaneConnect With a Mentor Commented:
If you use 86400 as the lifetime, try reducing it to 28800 on both devices, use SHA1 instead of MD5.   If the error still happens, then try dropping to DES instead of 3DES.    

I saw another post that recommended Deleting and recreating the SA on the sonicwall as a possible fix as well.  
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webleyaxsorAuthor Commented:
Hi, the lifetime is already set to 28800 for phase 1 and 2 , i have tried 3des and des for phase 1, also changed the authentication md5 to sha1 on both phases and rebuilt the the sa on the sonicwall, I have a sonicwall "expert" looking at it tomorrow, I will keep you updated, i am beginning to suspect a compatability issue between the 2 devices, oh for standards
andy ..
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webleyaxsorAuthor Commented:
thank you all sorted, liftime error
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webleyaxsorAuthor Commented:
all sorted thankyou
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webleyaxsorAuthor Commented:
thankyou very much, sorry for late reply for the points,
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