Hi, I have been trying to place a sonicwall pro unit beside my isaserver to provide an ipsec tunnel between two offices. The other location uses a PIX and I have been able to convince their admin to connect to the sonicwall. Everything that I have tried has resulted in the isa server blocking the authentication handshake between the two hw boxes. ISA Server pix ---------internet---------- Nat'd Network SonicWall Pro If anyone has any suggestions, I would greatly appreciate them. Darren Shears Manager, Corprate Infrastructure ContentAlive Inc Darrens@xxxxxxxxxxxxxxxx