Unable to connect my computer from LAN (http, smb)

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http://askubuntu.com – I installed ubuntu 10.04, Apache, PHP, mysql, smb. Everything work fine in locally in my IP. When i trying to access my computer from LAN (other computer), it shows unable to connect. when i ping my IP from remote computer, its pinging OK. I can access internet, and all other systems (http, smb). But the problem is no one can't access my computer remotely in my LAN network. My ip is and i want access(Appaceh,SMB) from Is there any proxy firewall settings? Please give me the solution. (HowTos)