Here's my setup: MARVIN: Linux / Redhat ES 3 ZAPHOD: Windows 2003 STD Edition; Active Directory Server. [root at marvin jalifrangis]# smbmount //zaphod/public /public cli_negprot: SMB signing is mandatory and we have disabled it. 18980: protocol negotiation failed SMB connection failed [root at marvin jalifrangis]#