How can i make a connection between an application and a database over net

dear sir
how can i make connection between an appliction and a database over internet while the client side appliction is behind proxy and firewall
for example how the live update of norton antivirus makes connection to the data server to make comparetions and get new virus definitions
does that depend on sockets technology ?
what references can guide me to the solution please?

The ability to do so depends entirely on the JDBC driver implementation having some proxy method. It needs to recognize the HTTP or SOCKS proxy and use them to connect, and the firewall and proxy need to allow those specific port connections.
To the best of my knowledge, all of these update utilities, e.g. live update for Netscape, Norton, etc., do not connect directly to the database. As it is, no sane security person would allow a database to be exposed to the Net. Rather, they connect using HTTP or HTTPS, which normally traverses firewalls just fine, to connect to a Web or application server on the far end. That application server then parses the request and retrieves whatever it needs to from the database.
In other words, you cannot have a 2-tier client/server application. You need a 3-tier application:
your client -> Web/app server -> database
where the connection from your client to the Web/app server is over http or https through the firewall and proxies.
Hope this helps.
Avi
dear sir
how can i make connection between an appliction and a
database over internet while the client side
appliction is behind proxy and firewall
for example how the live update of norton antivirus
makes connection to the data server to make
comparetions and get new virus definitions
does that depend on sockets technology ?
what references can guide me to the solution please?

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