How many network interfaces does the server have? Samba can be set to only use a specific interface which could also be an issue. If it has more than one interface do "ifconfig" and see if eth0 or eth1 is up then look at the samba config in the networking section if the correct interface is named in the quoted setting. If the settings are still commented out with ; then samba will listen to any available interface and you don't need to change anything.
Also try the following command to start samba incase the issue is that the service doesn't auto start at bootup.
If it gives you a success message then you can try browsing again, if it fails post the error message here and also the below logs and your samba config file.