This is my log: [code] stunnel 5.72 on x64-pc-mingw32-gnu platform 2024.03.10 10:19:49 LOG5[main]: Compiled/running with OpenSSL 3.2.1 30 Jan 2024 2024.03.10 10:19:49 LOG5[main]: Threading:WIN32 Sockets:SELECT,IPv6 TLS:ENGINE,FIPS,OCSP,PSK,SNI 2024.03.10 10:19:49 LOG7[main]: errno: (*_errno()) 2024.03.10 10:19:49 LOG6[main]: Initializing inetd mode configuration 2024.03.10 10:19:49 LOG7[main]: Running on Windows 6.2 Windows 10 2024.03.10 10:19:49 LOG5[main]: Reading configuration from file C:\Programs\stunnel\config\stunnel.conf 2024.03.10 10:19:49 LOG5[main]: UTF-8 byte order mark not detected 2024.03.10 10:19:49 LOG5[main]: FIPS mode disabled 2024.03.10 10:19:49 LOG6[main]: Compression disabled 2024.03.10 10:19:49 LOG7[main]: No PRNG seeding was required 2024.03.10 10:19:49 LOG6[main]: Initializing service [pop3_DocfxitGmail] 2024.03.10 10:19:49 LOG7[main]: Initializing context [pop3_DocfxitGmail] 2024.03.10 10:19:49 LOG6[main]: OpenSSL security level is used: 2 2024.03.10 10:19:49 LOG7[main]: Ciphers: HIGH:!aNULL:!SSLv2:!DH:!kDHEPSK 2024.03.10 10:19:49 LOG7[main]: TLSv1.3 ciphersuites: TLS_AES_256_GCM_SHA384:TLS_AES_128_GCM_SHA256:TLS_CHACHA20_POLY1305_SHA256 2024.03.10 10:19:49 LOG7[main]: TLS options: 0x2100000 (+0x0, -0x0) 2024.03.10 10:19:49 LOG6[main]: Session resumption enabled 2024.03.10 10:19:49 LOG7[main]: No certificate or private key specified 2024.03.10 10:19:49 LOG6[main]: No trusted certificates found [/code] I copied a working config from Windows 7 64bit. Running stunnel 5.50