[stunnel-users] Stunnel Connectivity Issue

Carter Browne cbcs at comcast.net
Tue Jun 13 19:10:41 CEST 2017


Dheeraj,

stunnel will keep the connection open for as long as your applications 
keeps it open.  When you exit telnet, it closes the connection.  I use 
stunnel mostly for RDP, VNC and telnet and as long the application is 
active, the port is open.  You need to have your application open the 
local port you want to route via stunnel (in your example 
127.0.0.1:9233).  As long as your application keeps the connection open 
(ignoring such issues as communications failures), stunnel will maintain 
the application. Telnet is a great tool for determining connectivity, 
but your application is going to have to handle the connection going 
forward.

Carter Browne


On 6/13/2017 12:01 PM, Dheeraj Gautam wrote:
>
> Hi Liz,
>
> Thanks for your reply.
>
> Actually we need to run a service which will work only once stunnel 
> connection establish and the service will work till the time 
> connection connected.
>
> But at the moment I don’t have idea like how the stunnel will remain 
> connected.
>
> Could you please suggest me to fix this so that stunnel connection 
> remain connected and I can run the application.
>
> Waiting for your valuable response.
>
> Regards,
>
> Dheeraj Gautam
>
> *From:*Liz Turi [mailto:lturi at maehc.org]
> *Sent:* Tuesday, June 13, 2017 9:19 PM
> *To:* Dheeraj Gautam <dheeraj.gautam at arborfs.com>; Małgorzata Olszówka 
> <Malgorzata.Olszowka at stunnel.org>
> *Cc:* stunnel-users at stunnel.org
> *Subject:* RE: [stunnel-users] Stunnel Connectivity Issue
>
> 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
>
> www.maehc.org<http://www.maehc.org>
>
> fb_icon<https://www.facebook.com/massachusettsehealthcollab?fref=nf>li_icon<https://www.linkedin.com/company/massachusetts-ehealth-collaborative?trk=tyah&trkInfo=clickedVertical%3Acompany%2Cidx%3A1-1-1%2CtarId%3A1432746657126%2Ctas%3AMassachusetts+eHEalth>tw_icon<https://twitter.com/MAeHC_org>
>
> *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 
> <mailto:Malgorzata.Olszowka at stunnel.org>>
> *Cc:* stunnel-users at stunnel.org <mailto: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 127.0.0.1 
> 9233. and just after connection closed.
>
> [TCP]
>
> client=yes
>
> cert = BBG_cert.pem
>
> key = BBG_key.pem
>
> verifyChain = yes
>
> CAfile = BBG_CACerts.pem
>
> connect = 69.191.198.34:8228 <http://69.191.198.34:8228>
>
> accept  = 127.0.0.1:9233 <http://127.0.0.1:9233>
>
> 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 
> 127.0.0.1:62736 <http://127.0.0.1:62736>
>
> 2017.06.13 16:38:38 LOG5[11]: s_connect: connected 69.191.198.34:8228 
> <http://69.191.198.34:8228>
>
> 2017.06.13 16:38:38 LOG5[11]: Service [TCP] connected remote server 
> from 172.16.1.23:62737 <http://172.16.1.23:62737>
>
> 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.
>
> Regards,
>
> 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 127.0.0.1 9233
>     the stunnel logs will show information about the connection attempt.
>
>     Regards,
>     Małgorzata
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