Hello, I need to create a server in dotnet application. I am using boost 1.33.1, asio 0.3.8 and vc++ 7.1 . The following code raises an "access denied" exception in a dotnet application. I have tested the same simple code in native c++ application, and it works. Do you have any idea how to resolve my problem? Is there a way to use asio in a dotnet application? try { asio::io_service io_service; asio::ip::tcp::acceptor acceptor(io_service); asio::ip::tcp::endpoint endpoint(asio::ip::tcp::v4(), 35454); acceptor.open(endpoint.protocol()); acceptor.set_option(asio::ip::tcp::acceptor::reuse_address(true)); // exception thrown here acceptor.bind(endpoint); // exception thrown here if previous line in comment acceptor.listen(); } catch(std::exception& excep) { MessageBox::Show(excep.what(),S"",MessageBoxButtons::OK,MessageBoxIcon::Erro r); } Regards, Baranger Guillaume