We have observed few regressions in XenServer since we upgraded our kernel from 3.10 to 4.x This is due to the change in the preferred authentication mechanism and its behaviour when the domain is not passed. Passing 'domain=""' instead of leaving it empty, could be a workaround (but it is not right in principle) if mount.cifs would allow this option to be sent to the kernel module. A patch for cifs-utils has been already submitted. The main points (see below) of the patch are: - It alignes behaviour with Windows clients - It fixes backward compatibility - It fixes UPN Germano Percossi (1): Fix default behaviour for empty domains and add domainauto option fs/cifs/cifsencrypt.c | 14 +++++++++----- fs/cifs/cifsglob.h | 2 ++ fs/cifs/connect.c | 7 +++++++ 3 files changed, 18 insertions(+), 5 deletions(-) -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-cifs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html