samba - Oct 2013 - can't acces samba share from windows xp

I can't acces a samba share from windows xp using netbios name. Though I
can access it using its IP address.

I can access that samba share from windows 7 with no problem at all.

samba server is v3.5.6, member server of active directory (samba4)

the logs show:
  error packet at smbd/sesssetup.c(334) cmd=115 (SMBsesssetupX)
NT_STATUS_TIME_DIFFERENCE_AT_DC


It all began after adjusting time zone in samba4 server and samba 3 server
to US/Eastern. Change from EDT to EST should take place on November 3rd.

Running in my windows xp box:

net time \\ad

yields:
Current time at \\AD is 10/31/2013 9:09AM
Local time (GMT-04:00) at \\AD is 10/31/2013 10:09AM
Command completed successfully.

See the difference between current time at AD and local time at AD.

Any ideas?

Thanks in advance,
Felix.