VPN connection between cisco pix 501 and sonicwall TZ170


When I try to create a VPN connection between a Cisco PIX501 and a Sonicwall TZ170, I keep receiving the error message :

"crypto_isakmp_process_block:src:xx.xx.xx.xx, dest: xx.xx.xx.xx spt:500 dpt:500 ISAKMP: phase 2 packet is a duplicate of a previous packet ISAKMP: resending last response"

(The Sonicwall is receiving the error "Illegal IPSEC SPI")

I can't figure out what's wrong, I tried different settings (encryption, ike lifetime etc.) but it is always the same result. If anybody has an experiece with this issue, any advise would be appreciated.

Thank you for your help, Akut

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