Re: [Openvpn-users] RMI works in one direction in VPN

[Maciej Gawinecki <mgawinecki@xxxxxxxxx>]

Unfortunately I have to use this RMI-based application. Setting 
/"java.rmi.server.hostname"/ system property at the server side fixed 
that problem.

Thank you for your support
Maciej

Charles Duffy napisał(a):
> First, a moment of personal opinion:
> 
> In terms of how its over-the-wire behavior is designed, Java RMI is 
> *absolutely horrific*. There's no excuse whatsoever -- in this day of 
> ubiquitous NAT -- for a network protocol to require that the remote side 
> initiate a separate connection in the opposite direction using an 
> address the server provides as the location it thinks it lives at.
> 
> 
> You can work around this (not for getting through NAT, but for the 
> multihomed server providing the wrong address to give to the client as 
> the place to initiate the callback from -- which is quite possibly what 
> you're seeing) by setting java.rmi.server.hostname to the IP address of 
> the server on the VPN. See 
> http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4880793 for some 
> general background and info and useful links and such.
> 
> Also -- it's been a while (over a year now) since I last dealt with 
> this, so I may remember the issues a bit differently than they actually 
> are. What I *do* recall is that Java RMI is an evil, evil, horrible... 
> oh, well, you get the idea. And that setting java.rmi.server.hostname to 
> the right address is important for getting it working correctly when the 
> server is multihomed.
> 
> 
> I haven't actually looked at your packet dumps yet -- make sure you have 
> that property set right, first, and if you have further issues I might 
> take a peek.
> 
> 
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