This error says that the client cannot authenticate with ISA serve.....but HOW ????? and what u said abt client address set.....I am using ..DCHP ... i am amusez how the client cannot authenticate with ISA server whn the same client is authenticate to use ISA server through active directory and every other things are working fine __________________________________ Do you Yahoo!? The New Yahoo! Shopping - with improved product search http://shopping.yahoo.com