EAP-TLS suddenly broken

Hi, I had been using EAP-TLS authentication with FreeRADIUS 2.1.12 on Debian Wheezy (OpenSSL 1.0.1e) and it worked fine, until I upgraded the Debian Wheezy packages (using apt-get dist-upgrade) several weeks ago. Then, the EAP-TLS authentication suddenly failed and became broken (see attached log). Is there anyone knows what go wrong ? Thanks a lot. John Mok