Using SLGridProxyApp fails with libomv clients for a number of reasons. The first one is there are two minor issues in the code that processes the login request. Using a libomv client this is via xml+llsd. This is easy to fix (but i have not done so yet due to follow on problems), any how the fix for this is in ProxyLoginSD(), the login request should be "application/xml+llsd" not "application/xml". and also the grid is hard coded to Aditi. After that, the libomv client stores its Caps in a Url class, which kindly filters the proxy url http://127.0.0.1:8080/https://sim5459.agni.lindenlab.com:12043/cap/cd2ef86b-8c5b-bda6-eba5-ded7085cc1f9 ends up - http://127.0.0.1:8080/https:/sim5459.agni.lindenlab.com:12043/cap/cd2ef86b-8c5b-bda6-eba5-ded7085cc1f9 (note the single / after the https This could be url escaped, or i've tried just working around it by adding it back in if it is missing. This leads to the next issue The libomv client manages to call the proxy with an invalid http request :- Doing caps to https://sim5459.agni.lindenlab.com:12043/cap/75c37014-9a0e-9385-ac6c-f3f2ea6b583e Client error: EOF in client HTTP header Unhandled Exception: System.ArgumentNullException: Argument cannot be null. Parameter name: bytes at System.Text.Encoding.GetString (System.Byte[] bytes) [0x00000] at GridProxy.Proxy.ProxyHTTP (System.Net.Sockets.Socket client) [0x00000] at GridProxy.Proxy+<RunLoginProxy>c_AnonStorey1.<>m_0 () [0x00000] So thats where we currently are.