stunnel-users

4 participants
3315 discussions

older browsers, stunnel and privoxy
by kovacs janos 04 Mar '24

04 Mar '24

sorry to bother, im trying to make older browsers be able to display TLS 1.1 and TLS 1.2 sites. i heard stunnel cant be configured to always forward to the current site address dynamically, thats why i would use privoxy. the browser is configured to send to: 127.0.0.1 443 stunnel config has this at the end: [Tunnel_in] client = yes accept = 127.0.0.1:443 connect = 127.0.0.1:8118 verifyChain = yes CAfile = ca-certs.pem checkHost = localhost 127.0.0.1:8118 is the privoxy address. this is what stunnel writes: LOG5[main]: Configuration successful LOG5[0]: Service [Tunnel_in] accepted connection from 127.0.0.1:3261 LOG5[0]: s_connect: connected 127.0.0.1:8118 LOG5[0]: Service [Tunnel_in] connected remote server from 127.0.0.1:3262 and the browser infinitely loads, and never loads anything or leaves the page. if i remove the last 3 lines, its the same just with this line added: LOG4[main]: Service [Tunnel_in] needs authentication to prevent MITM attacks but it doesnt give an error or anything. with a configuration like: [Tunnel_out] client = no accept = 127.0.0.1:443 connect = 127.0.0.1:8118 cert = stunnel.pem this is what it gives: LOG5[3]: Service [Tunnel_out] accepted connection from 127.0.0.1:3294 LOG3[3]: SSL_accept: 1407609B: error:1407609B:SSL routines:SSL23_GET_CLIENT_HELLO:https proxy request LOG5[3]: Connection reset: 0 byte(s) sent to TLS, 0 byte(s) sent to socket and browser gives a server not found error immediately. im not even sure if i should use client or server configuration in a case like this, but none of them works anyway. all i would need is for my browser to get the pages decrypted, or at least in less than TLS1.1. like how on newipnow.com i can access sites with any encryption, since they are sent to the browser without encryption. the browser just gives an "unencrypted tunnel" warning, which is how i found stunnel, and which is exactly what i need, just locally.

8 41

How to use best config to secure stunnel?
by sephrrr＠gmail.com 27 Feb '24

27 Feb '24

Irans goverment start to detect stunnel with openvpn tunnel. how to avoid this? is there any updates for stunnel for this problem?

1 0

Windows 2022 tunnel client issues
by Mark Weishaar 23 Feb '24

23 Feb '24

Hello, I’m working on replacing an older Windows server that uses stunnel 5.71 to connect to an Oracle database running on a Linux box. I can communicate just fine with the older Windows machine and another Linux box; however, when I try to connect with the stunnel 5.72 on the Windows 2022 server, I keep running into issues and the connection is forcibly closed. Old Windows server: stunnel 5.71 New Windows 2022 server: stunnel 5.72 (I also tried 5.71 and 5.62 just to rule things out Oracle db server: stunnel 5.72 Other Linux server: stunnel 5.72 My stunnel.conf file is very basic, but this is what is working from my other Windows server (running stunnel 5.71): debug = 7 [oracle15211] client = yes accept = 127.0.0.1:15211 connect = 172.28.125.52:15211 Below is the log with debug level 7… the only issue that I’m seeing is the “transfer() loop executes not transferring any data” message that baffles me but I’m not sure if that’s the cause of my issues or not: 2024.02.23 11:10:21 LOG7[0]: Service [oracle15211] started 2024.02.23 11:10:21 LOG7[0]: Setting local socket options (FD=768) 2024.02.23 11:10:21 LOG7[0]: Option TCP_NODELAY set on local socket 2024.02.23 11:10:21 LOG5[0]: Service [oracle15211] accepted connection from 127.0.0.1:49750 2024.02.23 11:10:21 LOG6[0]: s_connect: connecting 172.28.125.52:15211 2024.02.23 11:10:21 LOG7[0]: s_connect: s_poll_wait 172.28.125.52:15211: waiting 10 seconds 2024.02.23 11:10:21 LOG7[0]: FD=780 ifds=rwx ofds=--- 2024.02.23 11:10:21 LOG5[0]: s_connect: connected 172.28.125.52:15211 2024.02.23 11:10:21 LOG5[0]: Service [oracle15211] connected remote server from 172.28.112.245:49751 2024.02.23 11:10:21 LOG7[0]: Setting remote socket options (FD=780) 2024.02.23 11:10:21 LOG7[0]: Option TCP_NODELAY set on remote socket 2024.02.23 11:10:21 LOG7[0]: Remote descriptor (FD=780) initialized 2024.02.23 11:10:21 LOG6[0]: SNI: sending servername: 172.28.125.52 2024.02.23 11:10:21 LOG6[0]: Peer certificate not required 2024.02.23 11:10:21 LOG7[0]: TLS state (connect): before SSL initialization 2024.02.23 11:10:21 LOG7[0]: Initializing application specific data for session authenticated 2024.02.23 11:10:21 LOG7[0]: TLS state (connect): SSLv3/TLS write client hello 2024.02.23 11:10:21 LOG7[0]: TLS state (connect): SSLv3/TLS write client hello 2024.02.23 11:10:21 LOG7[0]: TLS state (connect): SSLv3/TLS read server hello 2024.02.23 11:10:21 LOG7[0]: TLS state (connect): TLSv1.3 read encrypted extensions 2024.02.23 11:10:21 LOG6[0]: CERT: Certificate verification disabled 2024.02.23 11:10:21 LOG6[0]: CERT: Certificate verification disabled 2024.02.23 11:10:21 LOG7[0]: TLS state (connect): SSLv3/TLS read server certificate 2024.02.23 11:10:21 LOG7[0]: TLS state (connect): TLSv1.3 read server certificate verify 2024.02.23 11:10:21 LOG7[0]: OCSP stapling: Client callback called 2024.02.23 11:10:21 LOG6[0]: OCSP: Certificate chain verification disabled 2024.02.23 11:10:21 LOG7[0]: TLS state (connect): SSLv3/TLS read finished 2024.02.23 11:10:21 LOG7[0]: TLS state (connect): SSLv3/TLS write change cipher spec 2024.02.23 11:10:21 LOG7[0]: TLS state (connect): SSLv3/TLS write finished 2024.02.23 11:10:21 LOG7[0]: 1 client connect(s) requested 2024.02.23 11:10:21 LOG7[0]: 1 client connect(s) succeeded 2024.02.23 11:10:21 LOG7[0]: 0 client renegotiation(s) requested 2024.02.23 11:10:21 LOG7[0]: 0 session reuse(s) 2024.02.23 11:10:21 LOG6[0]: TLS connected: new session negotiated 2024.02.23 11:10:21 LOG6[0]: TLSv1.3 ciphersuite: TLS_AES_256_GCM_SHA384 (256-bit encryption) 2024.02.23 11:10:21 LOG6[0]: Peer temporary key: X25519, 253 bits 2024.02.23 11:10:21 LOG7[0]: Compression: null, expansion: null 2024.02.23 11:10:21 LOG7[0]: TLS state (connect): SSL negotiation finished successfully 2024.02.23 11:10:21 LOG7[0]: TLS state (connect): SSL negotiation finished successfully 2024.02.23 11:10:21 LOG7[0]: Initializing application specific data for session authenticated 2024.02.23 11:10:21 LOG7[0]: Deallocating application specific data for session connect address 2024.02.23 11:10:21 LOG7[0]: New session callback 2024.02.23 11:10:21 LOG7[0]: Peer certificate was cached (1375 bytes) 2024.02.23 11:10:21 LOG6[0]: Session id: B36502A30B16F61EFE3A13B7BAA73BBCD57C2C6DB838FFC7CDFDE9BF7D8607A0 2024.02.23 11:10:21 LOG7[0]: TLS state (connect): SSLv3/TLS read server session ticket 2024.02.23 11:10:21 LOG7[0]: TLS state (connect): SSL negotiation finished successfully 2024.02.23 11:10:21 LOG7[0]: TLS state (connect): SSL negotiation finished successfully 2024.02.23 11:10:21 LOG7[0]: Initializing application specific data for session authenticated 2024.02.23 11:10:21 LOG7[0]: New session callback 2024.02.23 11:10:21 LOG7[0]: Deallocating application specific data for session connect address 2024.02.23 11:10:21 LOG6[0]: Session id: 7FC6ABDCD70443FE70736F725F90792FAC2692FD9AD8F54A3F0443C2403C9A0C 2024.02.23 11:10:21 LOG7[0]: TLS state (connect): SSLv3/TLS read server session ticket 2024.02.23 11:10:21 LOG3[0]: transfer() loop executes not transferring any data 2024.02.23 11:10:21 LOG3[0]: please report the problem to Michal.Trojnara(a)stunnel.org<mailto:[email protected]> 2024.02.23 11:10:21 LOG3[0]: stunnel 5.72 on x64-pc-mingw32-gnu platform 2024.02.23 11:10:21 LOG3[0]: Compiled/running with OpenSSL 3.2.1 30 Jan 2024 2024.02.23 11:10:21 LOG3[0]: Threading:WIN32 Sockets:SELECT,IPv6 TLS:ENGINE,OCSP,PSK,SNI 2024.02.23 11:10:21 LOG7[0]: errno: (*_errno()) 2024.02.23 11:10:21 LOG3[0]: protocol=TLSv1.3, SSL_pending=0, SSL_has_pending=0 2024.02.23 11:10:21 LOG3[0]: sock_open_rd=Y, sock_open_wr=Y 2024.02.23 11:10:21 LOG3[0]: SSL_RECEIVED_SHUTDOWN=n, SSL_SENT_SHUTDOWN=n 2024.02.23 11:10:21 LOG3[0]: sock_can_rd=n, sock_can_wr=n 2024.02.23 11:10:21 LOG3[0]: ssl_can_rd=n, ssl_can_wr=n 2024.02.23 11:10:21 LOG3[0]: read_wants_read=Y, read_wants_write=n 2024.02.23 11:10:21 LOG3[0]: write_wants_read=n, write_wants_write=n 2024.02.23 11:10:21 LOG3[0]: shutdown_wants_read=n, shutdown_wants_write=n 2024.02.23 11:10:21 LOG3[0]: socket input buffer: 0 byte(s), TLS input buffer: 0 byte(s) 2024.02.23 11:10:21 LOG5[0]: Connection reset: 685 byte(s) sent to TLS, 381 byte(s) sent to socket 2024.02.23 11:10:21 LOG7[0]: remote_fd reset (FD=780) 2024.02.23 11:10:21 LOG7[0]: Remote descriptor (FD=780) closed 2024.02.23 11:10:21 LOG7[0]: local_rfd/local_wfd reset (FD=768) 2024.02.23 11:10:21 LOG7[0]: Local descriptor (FD=768) closed 2024.02.23 11:10:21 LOG7[0]: Service [oracle15211] finished (0 left) Any help is greatly appreciated! Thank you, Mark

1 0

Dynamic DNS
by alstar＠maybenot.work 20 Feb '24

20 Feb '24

Hi, I'm running Stunnel on Linux. It needs to connect to a dynamic IP address (by domain name). The DNS is updated automatically. I noticed that the last time the address changed, Stunnel stopped working. A ping from the machine produced the correct address but Stunnel was using the old one. Will a reload work?

4 6

stunnel 5.72 released
by Michał Trojnara 05 Feb '24

05 Feb '24

Dear Users, I have released version 5.72 of stunnel. ### Version 5.72, 2024.02.04, urgency: MEDIUM * Security bugfixes - OpenSSL DLLs updated to version 3.2.1. * Bugfixes - Fixed SSL_CTX_new() errors handling. - Fixed OPENSSL_NO_PSK builds. - Android build updated for NDK r23c. - stunnel.nsi updated for Debian 12. - Fixed tests with OpenSSL older than 1.0.2. Home page: https://www.stunnel.org/ Download: https://www.stunnel.org/downloads.html SHA-256 hashes: 3d532941281ae353319735144e4adb9ae489a10b7e309c58a48157f08f42e949 stunnel-5.72.tar.gz 1037c53f8ab590c2f3001e54cf381c3ea4225e9670b03870191383060e6851e7 stunnel-5.72-win64-installer.exe 668161b90034820198c456b4137ed3680d6fd49d4de920d51e499b84538f63d3 stunnel-5.72-android.zip Best regards, Mike

1 0

error:0A00010B:SSL routines::wrong version number
by Graham Lang 18 Dec '23

18 Dec '23

Hi, I've been using Stunnel for many years without a problem but I just changed my email provider and now my mail client can't send emails. Receiving via POP is still fine, but sending via SMTP is giving the error "SSL_connect: ssl/record/ssl3_record.c:354: error:0A00010B:SSL routines::wrong version number" The old SMTP server was on port 465 whereas the new server (hotmail) is on port 587 so that may be the source of the problem. My config file is quite simple: socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 client = yes [pop] accept = 110 connect = outlook.office365.com:995 [smtp] accept = 25 connect = smtp-mail.outlook.com:587 I just changed the POP and SMTP server details to the new ones. POP is still on port 995 as it was before but SMTP has changed from 465 to 587. I was running an older version of Stunnel but updating to latest version hasn't helped. Does anyone have any ideas? I'd hate to have to lose my old Email client which has so many messages stored so it would be great to get it working fully with hotmail. Thanks! Graham.

4 3

stunnel - slowness
by Luciano Bonifácio 15 Dec '23

15 Dec '23

Good morning guys! I started using stunnel very recently with GLPI to authenticate to Google LDAP, and it is working, but with extreme slowness at Login. Something around 35 seconds. I believe there may be some parameters, adjustments to make. I'm sending the stunnel.conf configuration below, as well as the attached log file(txt). Could you give me a suggestion. Thanks, Luciano # stunnel.conf - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - debug = 7 output = /var/log/stunnel4/stunnel.log [ldap] client = yes accept = 127.0.0.1:1636 connect = ldap.google.com:636 cert = /etc/certificates/glpi_ldap.crt key = /etc/certificates/glpi_ldap.key - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

1 0

Paho connection to stunnel
by jesramsing＠hotmail.com 15 Dec '23

15 Dec '23

I have a strange problem connecting from a C++ application using the Paho framework to the stunnel. The certificates are self signed, and MQTT Explorerr hooks up nicely and validates the certificate when fed with the appropriate ca certificate. So, stunnel seems to behave nicely on some cases, others not. The stunnel log shows a SSL_accept: ssl/record/ssl3_record_c:354: errror: 0A00010B:SSL wrong version. I have tried version 1.1 and 1.2 in the Paho library, both failing with the same error code. Any ideas or suggestions?

1 0

Re: Getting logs in systemd environment
by Christopher Schultz 13 Dec '23

13 Dec '23

Michael, On 12/13/23 15:43, Michael D. Setzer II wrote: > /var/log/secure Thank you for your reply, but /var/log is basically empty (meaning very few files located there). journald has absorbed everything and files are no longer the way to get logs from systemd-based environments. The only thing which contains non-trivial information is /var/log/journal/* which is a bunch of binary files. My reply below shows how you can get the stunnel-related log messages. I don't believe they are available through any traditional text-based log file. -chris > On 13 Dec 2023 at 15:37, Christopher Schultz wrote: > > Date sent: Wed, 13 Dec 2023 15:37:04 -0500 > To: "'stunnel-users(a)stunnel.org'" > <stunnel-users(a)stunnel.org> > From: Christopher Schultz > <chris(a)christopherschultz.net> > Subject: [stunnel-users] Re: Getting logs in systemd > environment > patches" <stunnel-users.stunnel.org> > >> Carter, >> >> On 12/13/23 14:53, cbrowne wrote: >>> Have you tried doing "find / -name stunnel.log -print" as root. I have >>> found that the log file can be in a number of different locations >>> depending on the system. >> >> There are no files named stunnel.log on my system. >> >> I do not have a specific setting for "output". I was expecting syslog to >> be used for that purpose without a specific setting. syslog=yes appears >> to be the default given the man page for stunnel. >> >> But your comment got me more interested in exactly what was happening, >> so I tried /not/ limiting journalctl --follow to a specific service and >> I can see all kinds of things coming from stunnel: >> >> >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[main]: Found 1 ready >> file descriptor(s) >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[main]: FD=4 >> events=0x2001 revents=0x0 >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[main]: FD=11 >> events=0x2001 revents=0x1 >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[main]: FD=12 >> events=0x2001 revents=0x0 >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[main]: FD=13 >> events=0x2001 revents=0x0 >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[main]: FD=14 >> events=0x2001 revents=0x0 >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[main]: Service >> [ORU-outbound] accepted (FD=3) from ::ffff:20.204.213.204:55455 >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[174806]: Service >> [ORU-outbound] started >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[174806]: Setting local >> socket options (FD=3) >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[174806]: Option >> TCP_NODELAY set on local socket >> Dec 13 20:31:00 example.com stunnel[300695]: LOG5[174806]: Service >> [ORU-outbound] accepted connection from ::ffff:20.204.213.204:55455 >> Dec 13 20:31:00 example.com stunnel[300695]: LOG6[174806]: Peer >> certificate required >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[174806]: TLS state >> (accept): before SSL initialization >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[174806]: TLS state >> (accept): before SSL initialization >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[174806]: Initializing >> application specific data for session authenticated >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[174806]: SNI: no >> virtual services defined >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[174806]: TLS state >> (accept): SSLv3/TLS read client hello >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[174806]: TLS state >> (accept): SSLv3/TLS write server hello >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[174806]: TLS state >> (accept): SSLv3/TLS write certificate >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[174806]: TLS state >> (accept): SSLv3/TLS write key exchange >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[174806]: TLS state >> (accept): SSLv3/TLS write certificate request >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[174806]: TLS state >> (accept): SSLv3/TLS write server done >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[main]: Found 1 ready >> file descriptor(s) >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[main]: FD=4 >> events=0x2001 revents=0x0 >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[main]: FD=11 >> events=0x2001 revents=0x1 >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[main]: FD=12 >> events=0x2001 revents=0x0 >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[main]: FD=13 >> events=0x2001 revents=0x0 >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[main]: FD=14 >> events=0x2001 revents=0x0 >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[main]: Service >> [ORU-outbound] accepted (FD=15) from ::ffff:client.ip:44905 >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[174807]: Service >> [ORU-outbound] started >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[174807]: Setting local >> socket options (FD=15) >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[174807]: Option >> TCP_NODELAY set on local socket >> Dec 13 20:31:00 example.com stunnel[300695]: LOG5[174807]: Service >> [ORU-outbound] accepted connection from ::ffff:client.ip:44905 >> Dec 13 20:31:00 example.com stunnel[300695]: LOG6[174807]: Peer >> certificate required >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[174807]: TLS state >> (accept): before SSL initialization >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[174807]: TLS state >> (accept): before SSL initialization >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[174807]: Initializing >> application specific data for session authenticated >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[174807]: SNI: no >> virtual services defined >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[174807]: TLS state >> (accept): SSLv3/TLS read client hello >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[174807]: TLS state >> (accept): SSLv3/TLS write server hello >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[174807]: TLS state >> (accept): SSLv3/TLS write certificate >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[174807]: TLS state >> (accept): SSLv3/TLS write key exchange >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[174807]: TLS state >> (accept): SSLv3/TLS write certificate request >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[174807]: TLS state >> (accept): SSLv3/TLS write server done >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[174806]: TLS alert >> (read): fatal: certificate unknown >> Dec 13 20:31:00 example.com stunnel[300695]: LOG7[174806]: Remove >> session callback >> Dec 13 20:31:00 example.com stunnel[300695]: LOG3[174806]: SSL_accept: >> ssl/record/rec_layer_s3.c:1605: error:0A000416:SSL routines::sslv3 alert >> certificate unknown >> Dec 13 20:31:00 example.com stunnel[300695]: LOG5[174806]: Connection >> reset: 0 byte(s) sent to TLS, 0 byte(s) sent to socket >> >> So this probably just comes down to either systemd/journalctl or me >> being stupid. >> >> Instead of asking for the journal/log for the "unit" stunnel (i.e. >> journalctl -u stunnel), you need instead to ask for the "systelog >> identifier" called stunnel like this: >> >> $ journalctl -t stunnel >> >> If you use --follow you get tail -f behavior, which is nice to see >> what's happening in real-time. >> >> -chris >> >>> On 12/13/2023 2:39 PM, Christopher Schultz wrote: >>>> other systems (e.g. /var/log/seure, /var/log/auth, etc.). It appears >>>> the case that I should be able to view the journals using this command: >>>> >>>> sudo journalctl --follow -u stunnel.service >>>> >>>> But nothing is ever printed there. >>> >> _______________________________________________ >> stunnel-users mailing list -- stunnel-users(a)stunnel.org >> To unsubscribe send an email to stunnel-users-leave(a)stunnel.org > > > +------------------------------------------------------------+ > Michael D. Setzer II - Computer Science Instructor > (Retired) > mailto:[email protected] > mailto:[email protected] > mailto:[email protected] > Guam - Where America's Day Begins > G4L Disk Imaging Project maintainer > http://sourceforge.net/projects/g4l/ > +------------------------------------------------------------+ > > >

2 2

Getting logs in systemd environment
by Christopher Schultz 13 Dec '23

13 Dec '23

All, I recently built a server from scratch in Amazon EC2 using Amazon Linux 2023 which is systemd-based. When having trouble with a client failing to connect to our stunnel-based service, I tried raising the log level: debug=7 and restarted the service. I can't find any indication that the logs are available. There is no /var/log/stunnel directory. There are none of the usual files I might expect these logs to be in on other systems (e.g. /var/log/seure, /var/log/auth, etc.). It appears the case that I should be able to view the journals using this command: sudo journalctl --follow -u stunnel.service But nothing is ever printed there. Does anyone know how to get logging from stunnel in this kind of environment? (BTW, *I* am able to connect to this service, so I know it's running, etc. This is only a logging-problem, not an stunnel-isnt-working problem.) Thanks, -chris

2 1

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stunnel-users