Accepted connection and then TIMEOUTconnection exceeded: - stunnel-users

7 Dec 2023


      Hi All,
I can ssh to my VM with terminal etc.  However my stunnel has something stopping the packet flow?  What could be the problem and what should I check / troubleshoot:
client log file:
2023.12.07 07:21:05 LOG7[0]: Service [Sql_Silicon] started
2023.12.07 07:21:05 LOG7[0]: Setting local socket options (FD=636)
2023.12.07 07:21:05 LOG7[0]: Option TCP_NODELAY set on local socket
2023.12.07 07:21:05 LOG5[0]: Service [Sql_Silicon] accepted connection from 127.0.0.1:50474
2023.12.07 07:21:05 LOG6[0]: s_connect: connecting <IP>:<Port>
2023.12.07 07:21:05 LOG7[0]: s_connect: s_poll_wait <IP>:<Port>: waiting 10 seconds
2023.12.07 07:21:05 LOG7[0]: FD=676 ifds=rwx ofds=---
2023.12.07 07:21:15 LOG3[0]: s_connect: s_poll_wait <IP>:<Port>: TIMEOUTconnect exceeded
2023.12.07 07:21:15 LOG3[0]: No more addresses to connect
2023.12.07 07:21:15 LOG5[0]: Connection reset: 0 byte(s) sent to TLS, 0 byte(s) sent to socket
2023.12.07 07:21:15 LOG7[0]: local_rfd/local_wfd reset (FD=636)
2023.12.07 07:21:15 LOG7[0]: Local descriptor (FD=636) closed
2023.12.07 07:21:15 LOG7[0]: Service [Sql_Silicon] finished (0 left)
My VM is a linux server, on startup of stunnel I get this concerning message which might be the cause?
However, I checked and stunnel4:stunnel4 has permissions on the folder and psk file.
2023.12.07 07:40:45 LOG4[ui]: Insecure file permissions on /var/lib/stunnel4/pskSQL_.txt
server log file on start service:
2023.12.07 07:40:45 LOG7[ui]: Clients allowed=500
2023.12.07 07:40:45 LOG5[ui]: stunnel 5.56 on x86_64-pc-linux-gnu platform
2023.12.07 07:40:45 LOG5[ui]: Compiled with OpenSSL 1.1.1k  25 Mar 2021
2023.12.07 07:40:45 LOG5[ui]: Running  with OpenSSL 1.1.1w  11 Sep 2023
2023.12.07 07:40:45 LOG5[ui]: Threading:PTHREAD Sockets:POLL,IPv6,SYSTEMD TLS:ENGINE,FIPS,OCSP,PSK,SNI Auth:LIBWRAP
2023.12.07 07:40:45 LOG7[ui]: errno: (*__errno_location ())
2023.12.07 07:40:45 LOG5[ui]: Reading configuration from file /etc/stunnel/stunnel.conf
2023.12.07 07:40:45 LOG5[ui]: UTF-8 byte order mark not detected
2023.12.07 07:40:45 LOG5[ui]: FIPS mode disabled
2023.12.07 07:40:45 LOG7[ui]: Compression disabled
2023.12.07 07:40:45 LOG7[ui]: No PRNG seeding was required
2023.12.07 07:40:45 LOG4[ui]: Insecure file permissions on /var/lib/stunnel4/pskSQL_.txt
2023.12.07 07:40:45 LOG6[ui]: PSKsecrets line 1: 64-byte hexadecimal key configured for identity "siliconServer"
2023.12.07 07:40:45 LOG6[ui]: Initializing service [SQL-<port>]
2023.12.07 07:40:45 LOG6[ui]: PSK identities: 1 retrieved
2023.12.07 07:40:45 LOG7[ui]: Ciphers: PSK
2023.12.07 07:40:45 LOG7[ui]: TLSv1.3 ciphersuites: TLS_AES_256_GCM_SHA384:TLS_AES_128_GCM_SHA256:TLS_CHACHA20_POLY1305_SHA256
2023.12.07 07:40:45 LOG7[ui]: TLS options: 0x02100004 (+0x00000000, -0x00000000)
2023.12.07 07:40:45 LOG7[ui]: No certificate or private key specified
2023.12.07 07:40:45 LOG6[ui]: DH initialization needed for DHE-PSK-AES256-GCM-SHA384
2023.12.07 07:40:45 LOG7[ui]: DH initialization
2023.12.07 07:40:45 LOG7[ui]: No certificate available to load DH parameters
2023.12.07 07:40:45 LOG6[ui]: Using dynamic DH parameters
2023.12.07 07:40:45 LOG7[ui]: ECDH initialization
2023.12.07 07:40:45 LOG7[ui]: ECDH initialized with curves X25519:P-256:X448:P-521:P-384
2023.12.07 07:40:45 LOG5[ui]: Configuration successful
2023.12.07 07:40:45 LOG7[ui]: Binding service [SQL-<port>]
2023.12.07 07:40:45 LOG7[ui]: Listening file descriptor created (FD=9)
2023.12.07 07:40:45 LOG7[ui]: Setting accept socket options (FD=9)
2023.12.07 07:40:45 LOG7[ui]: Option SO_REUSEADDR set on accept socket
2023.12.07 07:40:45 LOG6[ui]: Service [SQL-<port>] (FD=9) bound to <IP>:<port>
2023.12.07 07:40:45 LOG5[ui]: Switched to chroot directory: /var/lib/stunnel4/
2023.12.07 07:40:45 LOG7[main]: Created pid file /stunnel.pid
2023.12.07 07:40:45 LOG7[cron]: Cron thread initialized
2023.12.07 07:40:45 LOG6[cron]: Executing cron jobs
2023.12.07 07:40:45 LOG5[cron]: Updating DH parameters