Hi, I missed another entry in log. The last line looks like an error. No limit detected for the number of clients stunnel 5.00 on x86-pc-msvc-1500 platform Compiled/running with OpenSSL 1.0.1f-fips 6 Jan 2014 Threading:WIN32 Sockets:SELECT,IPv4 SSL:ENGINE,OCSP,FIPS errno: (*_errno())