Error when trying to mount on samba 3.6.24

[sandeep nag]

I am seeing following error on wireshark packets when trying to access a
directory which has only read only permissions for the user. we use
acl_xattr module for acl support.

SesssionSetup Request, NTLMSSP_NEGOTIATE
SesssionSetup Response, Error: STATUS_MORE_PROCESSING_REQUIRED,
NTLMSSP_CHALLENGE.

Please suggest me on, what could be the issue and which function the issue
could be in?

Thanks,
Sandeep.