[stunnel-users] Stunnel Connectivity Issue

Liz Turi lturi at maehc.org
Tue Jun 13 17:49:16 CEST 2017

Hi, Dheeraj,

Are you testing the connection with Telnet? Or are you testing with the application. What I noticed in testing the connection is that once the command is completed, the connection is closed.

However, when I test from my application, its only closed once all transactions in that session are completed, and will show how much data was passed on (following from my logs at the end of a non-telnet test session.

2017.06.13 10:16:08 LOG6[1]: Negotiated TLSv1.2 ciphersuite AES256-GCM-SHA384 (256-bit encryption)
2017.06.13 10:16:18 LOG6[1]: Read socket closed (readsocket)
2017.06.13 10:16:18 LOG6[1]: SSL_shutdown successfully sent close_notify alert
2017.06.13 10:16:18 LOG6[1]: TLS closed (SSL_read)
2017.06.13 10:16:18 LOG5[1]: Connection closed: 2791 byte(s) sent to TLS, 1641 byte(s) sent to socket

Liz Turi
Sr. Consultant
Massachusetts eHealth Collaborative
860 Winter Street, Waltham, MA 02451
(m) 339-222-6614 (o) 781-907-7204 (f) 781-207-8589

From: stunnel-users [mailto:stunnel-users-bounces at stunnel.org] On Behalf Of Dheeraj Gautam
Sent: Tuesday, June 13, 2017 11:41 AM
To: Małgorzata Olszówka <Malgorzata.Olszowka at stunnel.org>
Cc: stunnel-users at stunnel.org
Subject: Re: [stunnel-users] Stunnel Connectivity Issue

HI Guys,

below is the config which i have configured with TLSv1.2, but still connection establishing only for while when i telnet telnet 9233. and just after connection closed.

cert = BBG_cert.pem
key = BBG_key.pem
verifyChain = yes
CAfile = BBG_CACerts.pem
connect =<>
accept  =<>
sslVersion = TLSv1.2

below the logs:

2017.06.13 11:57:49 LOG5[main]: Reading configuration from file stunnel.conf
2017.06.13 11:57:49 LOG5[main]: UTF-8 byte order mark detected
2017.06.13 11:57:49 LOG5[main]: FIPS mode disabled
2017.06.13 11:57:49 LOG3[main]: Service [TCP]: Each service must define two endpoints
2017.06.13 11:57:49 LOG3[main]: Failed to reload the configuration file
2017.06.13 16:37:16 LOG5[main]: Reading configuration from file stunnel.conf
2017.06.13 16:37:16 LOG5[main]: UTF-8 byte order mark detected
2017.06.13 16:37:16 LOG5[main]: FIPS mode disabled
2017.06.13 16:37:16 LOG4[main]: Service [TCP] uses "verifyChain" without subject checks
2017.06.13 16:37:16 LOG4[main]: Use "checkHost" or "checkIP" to restrict trusted certificates
2017.06.13 16:37:16 LOG5[main]: Configuration successful
2017.06.13 16:38:38 LOG5[11]: Service [TCP] accepted connection from<>
2017.06.13 16:38:38 LOG5[11]: s_connect: connected<>
2017.06.13 16:38:38 LOG5[11]: Service [TCP] connected remote server from<>
2017.06.13 16:38:39 LOG5[11]: Certificate accepted at depth=0: C=US, ST=NEW YORK, L=NEW YORK, O=Bloomberg LP, OU=FIXBETA, CN=fixbeta.bloomberg.com<http://fixbeta.bloomberg.com>, emailAddress=caadmin at bloomberg.com<mailto:caadmin at bloomberg.com>
2017.06.13 16:39:10 LOG5[11]: Connection closed: 0 byte(s) sent to TLS, 0 byte(s) sent to socket

i want connection remained connected every time so that i can run the application.

application can be work only if the connection remain connected.

please help me to sort this out.


Dheeraj Gautam

On 25 May 2017 at 12:29, Małgorzata Olszówka <Malgorzata.Olszowka at stunnel.org<mailto:Malgorzata.Olszowka at stunnel.org>> wrote:
Could you please let us know what parameters we are missing here due to which connection is not establishing with remote server.

Although, stunnel logs indicating that configuration successful, but in logs no where is mentioned about the connection is it connected or not,

Hello Dheeraj,

You should set the verifyChain option in order to verify the certificate stored in the file specified with CAfile:
verifyChain = yes

Then you can test your connection:
telnet 9233
the stunnel logs will show information about the connection attempt.

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