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I am new to ubuntu server as well as server too.

When I am checking the open port using command 'netstat' .On the column of local address, there is *.http and *:ssh

what does * meaning of?

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up vote 1 down vote accepted

It means that services http and ssh are listening on all addresses available on your server.

This means at least listening on localhost ( and probably on the LAN address (eg: 10.x.x.x or 192.168.x.x).

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The asterix indicates that the service is listening for traffic on ALL available addresses.

Localhost and the machines defined ip-address.
If the system has multiple ip-interfaces (and thus multiple ip-addresses), all of those are included.

If a service is only bound to a specific ip-address you will see that listed here by address.

Please note this also includes services listing for multicast addresses. (So you will see 224.0.0.* appear as an ip-address in some cases.)

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