Hi All, I'm trying to build a working OpenSC tokend [1] on Snow Leopard, but unfortunately I'm facing some issues and can't really understand what could be the cause. I've successfully built OpenSC.tokend on Snow Leopard through two different methods: using darwinbuild and through a modified Xcode project [2] provided by Martin Paljak. In both methods the result the same: a tokend that (almost) works. The generated tokend binary supports both the i386 and x86_64 architectures. When I insert the smart card, the tokend is correctly started, all keys and certificates are shown in keychain access, and all seems to be working fine. But, when I try to login locally (loginwindow) or with Safari to a site, it simply fails. It doesn't crash, but it doesn't appear to be doing anything at all. All exchanged APDUs are ok, which leads me to believe that the problem might not be with libopensc (that the tokend uses to communicate with the card) but in the tokend code itself… The OpenSC.tokend code being used it at [3]. Some notes: Trying to unlock the keychain associated with the tokend works. If I try to login locally with a smart card, the following message can be seen in /var/log/secure.log: authorizationhost[2237]: failed to sign data (-2147416018) OpenSC's command line tools (pkcs11-tool, pkcs15-tool, etc.) and the PKCS #11 module (opensc-pkcs11.so) work fine. Could anyone explain how does one properly debugs a tokend? I'm not referring to lower level debugging methods like capturing APDUs and such - I'm ok with that. I've tried putting some debug statements in the tokend code but all seems "ok". Is there any way to follow the execution flow of the Tokend and maybe even securityd? I think that without having the big picture of the architecture (what components exist, what is their relationship, how do they interact, what do they expect, …) it will be pretty difficult to find the problem. If anyone can help, I would be really grateful! Thank you. João [1] - http://www.opensc-project.org/sca/wiki/OpenscTokend [2] - http://wiki.github.com/martinpaljak/opensc.tokend [3] - http://www.opensc-project.org/sca/browser/trunk/opensc.tokend/OpenSC