[CentOS] Samba vs. Firewall and/or SELinux

Hi all.

I created a smb-share on my el6 for all windows-pcs in my
home-network (I'm the only Linux-User in my family) for sharing all the
stuff we have, like music and videos and documents. The share will be
shown on the other pcs (Windows XP), but they can't open it. The
error-message ist "Share not found" on our preferred language of course!

SELINUX-CONFIG
sh-4.1# cat /etc/selinux/targeted/contexts/files/file_contexts.local
# This file is auto-generated by libsemanage
# Do not edit directly.

/data(/.*)?    system_u:object_r:samba_share_t:s0


FIREWALL-CONFIG (Port 901 is for SWAT)
sh-4.1#  cat /etc/sysconfig/iptables
# Generated by iptables-save v1.4.7 on Thu Dec 20 17:28:14 2012
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -p tcp -m state --state NEW -m tcp --dport 901 -j ACCEPT 
-A INPUT -p tcp -m state --state NEW -m tcp --dport 445 -j ACCEPT 
-A INPUT -p tcp -m state --state NEW -m tcp --dport 139 -j ACCEPT 
-A INPUT -p udp -m state --state NEW -m udp --dport 138 -j ACCEPT 
-A INPUT -p udp -m state --state NEW -m udp --dport 137 -j ACCEPT 
COMMIT
# Completed on Thu Dec 20 17:28:14 2012


SAMBA-CONFIG  "Alice im Wunderland" is the testfile I uploaded with
disabled Firewall and disabled SELinux 
sh-4.1# testparm
Load smb config files from /etc/samba/smb.conf
rlimit_max: increasing rlimit_max (1024) to minimum Windows limit
(16384) Processing section "[public]"
Loaded services file OK.
Server role: ROLE_STANDALONE
Press enter to see a dump of your service definitions

[global]
	workgroup = NETZWERK
	server string = Samba Server Version %v
	security = SHARE
	log file = /var/log/samba/log.%m
	max log size = 50
	cups options = raw

[public]
	comment = hier kannn reinkopiert werden
	path = /data/public
	read only = No
	create mask = 0777
	guest only = Yes
	guest ok = Yes
sh-4.1#  cat /etc/samba/smbusers 
# Unix_name = SMB_name1 SMB_name2 ...
root = administrator admin
nobody = guest pcguest smbguest
sh-4.1# ls -lisah /data/public
total 144M
1703938  12K drwxrwxrwx.  4 nobody     users       12K Dec 27 13:39 .
1703937 4.0K drwxr-xr-x.  3 root       root       4.0K Dec 22 19:43 ..
1706985 144M -rwxrw-rw-   1 nobody     nobody     144M Dec 27 13:39
Disney_ Alice im Wunderland (1951).mp4

-- 
Ibrahim "Arastirmacilar" Yurtseven
2.6.32-279.19.1.el6.i686