Created attachment 8091 [details]
samba log for client involved

When connecting to a samba share (\\<servername>\Public) running on a Unbuntu 12.04 server running samba 3.6.3, from a client running windows 7, I receive the error : The specified network name is no longer available. 

On the server, the log shows a samba PANIC: sys-setgroups failed.

This problem suddenly showed up roughly 2 weeks ago, so it could be patch related (either windows or samba-side). No config changes were made prior to problem showing up.

This is the config for Samba on the server:

[global]
	log file = /var/log/samba/log.%m
	passwd chat = *Enter\snew\s*\spassword:* %n\n *Retype\snew\s*\spassword:* %n\n *password\supdated\ssuccessfully* .
	obey pam restrictions = yes
	socket options = TCP_NODELAY
	map to guest = bad user
	winbind trusted domains only = no
	encrypt passwords = yes
	winbind use default domain = yes
	passdb backend = tdbsam
	passwd program = /usr/bin/passwd %u
	dns proxy = no
	netbios name = <servername>  #real name removed
	server string = %h server (Samba, Ubuntu)
	unix password sync = yes
	workgroup = WORKGROUP
	os level = 20
	syslog = 0
	panic action = /usr/share/samba/panic-action %d
	usershare allow guests = yes
	max log size = 1000
	pam password change = yes
[printers]
	create mask = 0700
	comment = All Printers
	printable = yes
	guest only = yes
	public = yes
	path = /var/spool/samba
[print$]
	guest ok = no
	comment = Printer Drivers
	writable = no
	path = /var/lib/samba/printers

[Public]
	writeable = yes
	path = /home/Public
	force group = shrpublic
	force user = nralbers
	comment = Public data share
	guest only = yes
	public = yes