Communication with the underlying transaction manager has failed when all settings Ok

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I have implement a application in VPN using C# i used the TransactionScope to manage the database Tranasactions

and i setting up the MSDTC Security setting as normal in both server and client pc and

my setting Image Sample

it works fine in the same ip range as eg client 192.168.10.20 when the server use 192.168.10.17

i have ping the client ip and server ip using cmd its working .but the case is it saying "Communication with the underlying transaction manager has failed"

both computers farewell off
Server PC =windows 7 ultimate
client pc =Windows 7 ultimate
Server ip =192.168.10.17
Client Ip=192.168.17.20