One host unavailable over (Open)VPN

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http://serverfault.com – I have an interesting issue with OpenVPN Ubuntu 12.04. I've been running an OPenVPN box for some time now. Clients can connect with Linux, Windows and OSX no problem and it seems stable. However I added another host to the network recently and it is not accessible over the VPN. Some of the details are: LAN Gateway VPN Box: Bad Machine: So basically I can ping, ssh, web browse e.t.c to any machine on the LAN apart from When I'm in the office it is fine I can connect to all services on that machine no problem. The only difference I see (HowTos)