questions on dedicated VPN link

[Nay Myo Win]

Dear brothers.

I have two offices and both have their own internet access.
One has ADSL and the other has broadband. Internet Service Provider is the
same for both and they allow only HTTP and HTTPS ports. other ports are
banned.
I now would like to create VPN links between two offices placing each UBuntu
VPN server with OpenVPN on each office. Is that possible? Please suggest me
how to? I am very new to linux and VPN.

I do not want demand dial connection. I just need always connected link as
long as Internet and electricity is up in both offices.

thanks

Tommy
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