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VPN pass-through Forti 110C


I have a question about a kind of VPN pass-through mode on Fortigate 110C, v4.0 MR3 Path 6 - I have some users inside company network, who needs to connect to external, small VPN+XAuth by software client (Shrew). Everything, in my opinion, is already set,  but all I have is "negotiation timout occurred" error.  Shrew use 500 and 4500 UDP- this ports are open, additionally services like IKE, IP50,IP51,IP47 are permitted from my local LAN port to WAN port. Thanks a lot for any advices...