Hi Simon, In the system i have 3 users 1)root 2)cond 3)media In case 1 works perfectly fine a)The dbus is launched by the user 'cond ' b)The server application is launched by user 'cond' c)The Client application is launched by user 'cond' In this case the client & server communicates very well through Dbus In case 2:- a) The dbus is launched by the user 'cond ' b)The server application is launched by user 'cond' c)The Client application is launched by user 'media' In this case server program runs without any problem when i client program is launched by the user media i get the following error [Invalid UTF-8] client: ERROR: Couldn\x92t connect to the Session bus (Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.) Configuration files:- When i look into the configuration files i can see that policy is set to allow connection from all user.i am enclosing the conf files what i have here. The source code for server /client & make file are available in the following link <pre><a href="http://maemo.org/maemo_training_material/maemo4.x/html/maemo_Platform_Development_Chinook/APPENDIX_F_Source_code_for_the_GLibDBus_asynchronous_examples.html">http://maemo.org/maemo_training_material/maemo4.x/html/maemo_Platform_Development_Chinook/APPENDIX_F_Source_code_for_the_GLibDBus_asynchronous_examples.html</a> Kidnly help me to solve this problem With thanks & regards Ramesh </pre>