Also clear the error queue before calling SSL_CTX_use_certificate[_chain]_file (workaround for OpenSSL versions before 0.9.8h, see https://rt.openssl.org/Ticket/Display.html?user=guest&pass=guest&id=1513). PR 56410.
httpd/httpd/trunk/CHANGES
httpd/httpd/trunk/modules/ssl/ssl_engine_init.c