[stunnel-users] stunnel ignoring config file for port binding

Tim Turner tim.turner at lmax.com
Sat Apr 18 11:13:13 CEST 2020

Config and logs below but redacted, this is running on 2016 server, if it matters I am starting it over an RDP session

I find that the port is ignored in the config file and it always binds to ports in the 23*** range

; Sample stunnel configuration file by Michal Trojnara 2002-2006
; Some options used here may not be adequate for your particular configuration

; Certificate/key is needed in server mode and optional in client mode
; The default certificate is provided only for testing and should not
; be used in a production environment
;cert = stunnel.pem
;key = stunnel.pem

; Some performance tunings
socket = l:TCP_NODELAY=1
socket = r:TCP_NODELAY=1

; Workaround for Eudora bug

; Authentication stuff
;verify = 2
; Don't forget to c_rehash CApath
;CApath = certs
; It's often easier to use CAfile
;CAfile = certs.pem
; Don't forget to c_rehash CRLpath
;CRLpath = crls
; Alternatively you can use CRLfile
;CRLfile = crls.pem

; Some debugging stuff useful for troubleshooting
debug = 7
output = /stunnel.log

; Use it for client mode
client = yes

; Service-level configuration

[Service Config]
connect = redacted:443

log file

2020.04.18 10:08:18 LOG7[main]: Dispatching a signal from the signal pipe
2020.04.18 10:08:18 LOG7[main]: Processing SIGNAL_RELOAD_CONFIG
2020.04.18 10:08:18 LOG7[main]: Running on Windows 6.2
2020.04.18 10:08:18 LOG5[main]: Reading configuration from file stunnel.conf
2020.04.18 10:08:18 LOG5[main]: UTF-8 byte order mark detected
2020.04.18 10:08:18 LOG7[main]: Compression disabled
2020.04.18 10:08:18 LOG7[main]: No PRNG seeding was required
2020.04.18 10:08:18 LOG6[main]: Initializing service [Service Config]
2020.04.18 10:08:18 LOG7[main]: Ciphers: HIGH:!aNULL:!SSLv2:!DH:!kDHEPSK
2020.04.18 10:08:18 LOG7[main]: TLSv1.3 ciphersuites: TLS_CHACHA20_POLY1305_SHA256:TLS_AES_256_GCM_SHA384:TLS_AES_128_GCM_SHA256
2020.04.18 10:08:18 LOG7[main]: TLS options: 0x02100004 (+0x00000000, -0x00000000)
2020.04.18 10:08:18 LOG7[main]: No certificate or private key specified

2020.04.18 10:08:18 LOG4[main]: Service [Digital-Prod-MTF-FIX-MD] needs authentication to prevent MITM attacks
2020.04.18 10:08:18 LOG5[main]: Configuration successful
2020.04.18 10:08:18 LOG7[main]: Deallocating section defaults
2020.04.18 10:08:18 LOG5[main]: Logging to C:\Users\turnert\AppData\Local\/stunnel.log
2020.04.18 10:08:18 LOG7[main]: Binding service [New Broker FIX Demo-Trading]
2020.04.18 10:08:18 LOG7[main]: Listening file descriptor created (FD=1296)
2020.04.18 10:08:18 LOG7[main]: Setting accept socket options (FD=1296)
2020.04.18 10:08:18 LOG7[main]: Option SO_EXCLUSIVEADDRUSE set on accept socket
2020.04.18 10:08:18 LOG6[main]: Service [New Broker FIX Demo-Trading] (FD=1296) bound to
2020.04.18 10:08:18 LOG7[main]: Binding service [Service Config]

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