I have and office connected with a vpn using a PIX 506e firewall. I have PAT and when try to connect to an external system it returns an error 'invalid password'. I active a debug packet in the interface inside and outside and the packet in the inside interface has the correct information but the packet passing the interface outside looks as it was incomplete, please see the doc attached. Do you anybody why this could be happening?

xxx.xxx.xxx.194 is the pix ouside ip and xxx.xxx.xxx.18 is the external system

thanks in advance for any help