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VPN with java

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Hi all,
I have a small problem exchanging data between two servers by using an unsecure connection(XML-RPC). Due to the fact that one server has to communicate with several "client" servers using SSL and verify it with verisign or something similar for the secure communication is too expensive.
I was thinking of maybe developing a communication with a vpn but really don't have any experience in it or ideas how it works. Maybe I'm also on the wrong way with it. Are there some implementations or open source products which offer a an easy setup of a vpn between two servers using XML RPC and Java?
If you have any ideas how to establish a secure connection between these two servers I'll be happy for every idea. I was even thinking of just calling a function with a String parameter, defining a protocol for the String and encrypt only the String with a private key encryption mechanism, so I'm open for every idea no matter how crazy it may sound in the first moment.
Thx for your help,
best regards
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