- stunnel-users - stunnel.org

clarification on Security BugFix released in version 5.57
by svitatissimo2004＠hotmail.com 15 Oct '20

15 Oct '20

looking the changelog of latest version of stunnle (version 5.57) I see the following statement: "The "redirect" option was fixed to properly handle "verifyChain = yes" (thx to Rob Hoes)." It is possible to have more information on the vulnerability fixed?

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clarification on Security BugFix released in version 5.57
by svitatissimo2004＠hotmail.com 15 Oct '20

15 Oct '20

looking the changelog of latest version of stunnle (version 5.57) I see the following statement: "The "redirect" option was fixed to properly handle "verifyChain = yes" (thx to Rob Hoes)." It is possible to have more information on the vulnerability fixed?

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CERT: Pre-verification error: unsupported certificate purpose
by Bob Bob 12 Oct '20

12 Oct '20

Hi, I just updated to version 5.57 and the config I used for ever does not work anymore. I regenerated the self certs using the "Build a Self-signed stunnel.pem" in Windows and made sure the CN was matching the hostname of the server machine. I understand there is an issue with the self signed certificate... ...but it was working fine under 5.56. Server configuration [Server_SyncThing] cert = stunnel.pem accept = 999 connect = 127.0.0.1:24596 ciphers = PSK PSKsecrets = psk.txt Client configuration [SyncThing] client = yes accept = 127.0.0.1:24596 connect = 192.168.0.102:999 verifyPeer = yes CAfile = stunnel.pem PSKsecrets = psk.txt Service [SyncThing] connected remote server from 192.168.1.44:5455 2020.10.12 14:25:06 LOG7[33]: Setting remote socket options (FD=1516) 2020.10.12 14:25:06 LOG7[33]: Option TCP_NODELAY set on remote socket 2020.10.12 14:25:06 LOG7[33]: Remote descriptor (FD=1516) initialized 2020.10.12 14:25:06 LOG6[33]: SNI: sending servername: 192.168.0.102 2020.10.12 14:25:06 LOG6[33]: Peer certificate required 2020.10.12 14:25:06 LOG7[33]: TLS state (connect): before SSL initialization 2020.10.12 14:25:06 LOG7[33]: Initializing application specific data for session authenticated 2020.10.12 14:25:06 LOG6[33]: PSK client configured for identity "user1" 2020.10.12 14:25:06 LOG7[33]: Initializing application specific data for session authenticated 2020.10.12 14:25:06 LOG7[33]: TLS state (connect): SSLv3/TLS write client hello 2020.10.12 14:25:06 LOG7[33]: TLS state (connect): SSLv3/TLS write client hello 2020.10.12 14:25:06 LOG7[33]: TLS state (connect): SSLv3/TLS read server hello 2020.10.12 14:25:06 LOG7[33]: TLS state (connect): TLSv1.3 read encrypted extensions 2020.10.12 14:25:06 LOG7[33]: Verification started at depth=0: C=FR, ST=Centre, L=Marseilles, O=CA, OU=CA, CN= TRUCK-D98J8TY 2020.10.12 14:25:06 LOG4[33]: CERT: Pre-verification error: unsupported certificate purpose 2020.10.12 14:25:06 LOG4[33]: Rejected by CERT at depth=0: C=FR, ST=Centre, L=Marseilles, O=CA, OU=CA, CN= TRUCK-D98J8TY 2020.10.12 14:25:06 LOG7[33]: TLS alert (write): fatal: unsupported certificate 2020.10.12 14:25:06 LOG3[33]: SSL_connect: ssl/statem/statem_clnt.c:1913: error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed 2020.10.12 14:25:06 LOG5[33]: Connection reset: 0 byte(s) sent to TLS, 0 byte(s) sent to socket 2020.10.12 14:25:06 LOG7[33]: Deallocating application specific data for session connect address 2020.10.12 14:25:06 LOG7[33]: Deallocating application specific data for session connect address 2020.10.12 14:25:06 LOG7[33]: Remote descriptor (FD=1516) closed Any help would be welcome. Thanks.

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Stunnel inetd Linux configuration
by Marco Marchi 30 Sep '20

30 Sep '20

Good morning, I'm trying to configure Stunnel on Linux (Slackware 14). Can anybody post an example of configuration file in order to run and manage Stunnel by means of inetd, keeping in mind that goal is to secure pop3 and imap? Openssl is already installed and running (version 1.1.1g, april 2020). Stunnel version downloaded and installed is 5.56. Certifcate has been generated by means of Openssl. Issues are related to the right syntax in stunnel.conf. Thank you in advance. Marco

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sslVersion
by Ray 25 Sep '20

25 Sep '20

Hi Is sslVersion a global parameter that belongs to all segments or can it be inside a segment to only affect that segment? Example: output = /tmp/stunnel.log debug = emerg sslVersion = all # I assume it is applied to all Stunnel connection definitions [Stunnel_1] sslVersion = tls1_2 # How about this? I only want Stunnel_1 to be affected with sslVersion tls1_2 option. client = yes accept = 2222 connect = some_domain.com.au:8449 verify = 2 CAfile = /etc/stunnel/certs/root_digicert_ca.crt Thanks Ray

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Address already in use (98) error trying to run stunnel client in Ubuntu Docker container
by greg＠yesenergy.com 24 Sep '20

24 Sep '20

Hello all, I'm getting the following error when I try to connect to a remote server from inside a running Docker container: "Binding service [client] to 127.0.0.1:1589: Address already in use (98)". I don't think this port is actually in use, and I've tried other ports with the same results. I know that this configuration works in my Windows dev machine, from which I have consistently connected to the remote server, no problem. I suspect this might be related to Docker's internal networking schema and port-forwarding, but I thought I would ask this group if anyone knows how to overcome this hurdle. Thanks for listening! Here is the config: [client] client = yes accept = 127.0.0.1:1589 connect = nn.nnn.nnn.nnn:443 checkHost = xxxxxxxxx.com sslVersion = TLSv1.2 CAfile = /usr/local/etc/stunnel/my_pemfile.pem verifyPeer = yes Here is the log trace: [ ] Clients allowed=512000 [.] stunnel 5.56 on x86_64-pc-linux-gnu platform [.] Compiled/running with OpenSSL 1.1.1d 10 Sep 2019 [.] Threading:PTHREAD Sockets:POLL,IPv6 TLS:ENGINE,FIPS,OCSP,PSK,SNI [ ] errno: (*__errno_location ()) [.] Reading configuration from file /usr/local/etc/stunnel/stunnel.conf [.] UTF-8 byte order mark detected [.] FIPS mode disabled [ ] Compression disabled [ ] No PRNG seeding was required [ ] Initializing service [client] [ ] Ciphers: DES-CBC3-SHA:IDEA-CBC-MD5-DHE-RSA-AES256-SHA:DHE-DSS-AES256-SHA:AES256-SHA [ ] TLSv1.3 ciphersuites: TLS_CHACHA20_POLY1305_SHA256:TLS_AES_256_GCM_SHA384:TLS_AES_128_GCM_SHA256 [ ] TLS options: 0x02100004 (+0x00000000, -0x00000000) [ ] No certificate or private key specified [.] Configuration successful [ ] Binding service [client] [ ] Listening file descriptor created (FD=8) [ ] Setting accept socket options (FD=8) [ ] Option SO_REUSEADDR set on accept socket [.] Binding service [client] to 127.0.0.1:1589: Address already in use (98) [ ] Listening file descriptor created (FD=8) [ ] Setting accept socket options (FD=8) [ ] Option SO_REUSEADDR set on accept socket [.] Binding service [client] to 127.0.0.1:1589: Address already in use (98) [!] Binding service [client] failed [ ] Deallocating section defaults [ ] Unbinding service [client] [ ] Service [client] closed [ ] Deallocating section [client]

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Stunnel to smtp-relay.gmail.com
by Anton Palmgård 22 Sep '20

22 Sep '20

Hi, a few days ago up to a week my stunnel connection to smtp-gmail.gmail.com. stopped working with the error: ep 21 17:25:57 stunnel LOG50: Connection reset: 0 byte(s) sent to TLS, 0 byte(s) sent to socket Sep 21 17:25:57 stunnel LOG30: Remote server is not RFC 1425 compliant Sep 21 17:25:57 stunnel LOG50: Service [to_gmail] connected remote server from xxx.xxx.xxx.xxx:29662 Tried from 2 different Locations / sites (i.e companies) same error. The relay work fine without client settings but that leaves TLS to the endpoint.. Office 365 relay works fine with TLS. Contacted Google support but the claimed nothing have been changed. I assume somehting with the TLS version/ CIPHERS is wrong ? Conf simply looks like this: cert = /usr/local/etc/stunnel/stunnel.pem chroot = /var/tmp/stunnel setuid = stunnel setgid = stunnel [to_gmail] client = yes accept = 0.0.0.0:587 connect = smtp-relay.gmail.com:587 debug = 7 TIMEOUTclose = 0 protocol = smtp BR, Anton.

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Stunnel failover
by Ray 16 Sep '20

16 Sep '20

Stunnel's failover option with prio settings works fine but the application first tries 3 syn to connect to the first endpoint and if failed then it tries the second endpoint. Is there any way to configure stunnel to try only once and failover to the second connection endpoint?

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using Android Keystore with stunnel
by blacksun＠directbox.com 09 Sep '20

09 Sep '20

Hello, i am using stunnel 5.56 on Android 7.0. It is a non-rooted device. Android stores keys and certs in the android keystore. I am using a Let's Encrypt Cert on serverside, and on clients the options veryChain and chechHost. How can i use the System-integrated CA-Certs of Android for verifying the server-cert issued by Let's Encrypt? When i am searching the net, there are infos saying that the certs and keys are not accessible by filestructure, but there would be apis to access the keystore. The keystore would be protected with the PIN of the device. Thanks.

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How to configure stunnel as HTTP proxy on Windows?
by Jason Long 08 Sep '20

08 Sep '20

Hello, I want to use stunnel on Windows as HTTP proxy, I changed the configuration as below: ; Encrypted HTTP proxy authenticated with a client certificate ; located in the Windows certificate store [example-proxy] client = yes accept = 127.0.0.1:8080 connect = google.com:8443 ;engineId = capi ; Encrypted HTTP proxy authenticated with a client certificate ; located in a cryptographic token [example-pkcs11] client = yes accept = 127.0.0.1:8080 connect = google.com:8443 ;engineId = pkcs11 cert = pkcs11:token=MyToken;object=MyCert key = pkcs11:token=MyToken;object=MyKey But, it show me configuration error. How can I solve it? Thank you.

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Stunnel - how to block IPs?
by Brent Kimberley 04 Sep '20

04 Sep '20

Hi James.To the best of my knowledge, your options include Darwin firewall and HAProxy - geoip. >>Just wondering if there is a way to have Stunnel not accept connection from certain IPs? stunnel -version stunnel 5.56 on x86_64-apple-darwin18.7.0 platform Threading:PTHREAD Sockets:POLL,IPv6 TLS:ENGINE,FIPS,OCSP,PSK,SNI

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Stunnel - how to block IPs?
by James Brown 03 Sep '20

03 Sep '20

Just wondering if there is a way to have Stunnel not accept connection from certain IPs? stunnel -version stunnel 5.56 on x86_64-apple-darwin18.7.0 platform Threading:PTHREAD Sockets:POLL,IPv6 TLS:ENGINE,FIPS,OCSP,PSK,SNI Thanks, James.

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TLS1.0 fallback when only TLS1.2 allowed
by Wojciech Machula 31 Aug '20

31 Aug '20

So I've configured my stunnel to only use TLS1.2 and usually works ok. However when client gets some bad L7 response it send a TCP RST, after which all subsequent stunnel TLS Client Hellos are some hybrid of TLS1.0/TLS1.2, as can be seen in tshark output below. Once I restart the whole stunnel process subsequent TLS handshakes work fine using TLS1.2, until the next client RST is received. $ stunnel -version stunnel 4.56 on x86_64-redhat-linux-gnu platform $ cat /etc/centos-release CentOS Linux release 7.8.2003 (Core) $cat /etc/stunnel/dsr2rtcg-stunnel.conf output = /var/log/stunnel pid = /etc/stunnel/stunnel.pid socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 [poc] cert = /etc/pki/tls/certs/stunnel/aaa.crt key = /etc/pki/tls/private/stunnel/aaa.key CAfile = /etc/pki/tls/certs/stunnel/bbb.crt client = yes sslVersion = TLSv1.2 options = NO_TLSv1 accept = 172.18.180.78:45154 connect = 10.74.0.196:45154 ciphers = TLSv1.2+HIGH:!aNULL $ tshark -nn -V -d tcp.port==45154,ssl -r 20200729_09:42:44-port45154.pcap -2R "ssl.handshake" -c 1 | grep -i tls -B3 Secure Sockets Layer SSL Record Layer: Handshake Protocol: Client Hello Content Type: Handshake (22) Version: TLS 1.0 (0x0301) -- Handshake Protocol: Client Hello Handshake Type: Client Hello (1) Length: 1610 Version: TLS 1.2 (0x0303)

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Sslkeylog
by Brent Kimberley 22 Aug '20

22 Aug '20

>>Any suggestions on sslkeylog via stunnel application Call SSL_CTX_set_keylog_callback() !? On Thu, Aug 13, 2020, 16:44 tayyib ahmed <tayyib76(a)gmail.com> wrote: > Hi Guys > > Is there any option to set sslkeylog to get ssl session id for stunnel > session? > > Br xx >

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How to archive DNS load balance in stunnel client?
by Peter Zhao 22 Aug '20

22 Aug '20

Hi, We are trying to use DNS load balance in a stunnel client with round-robin algorithm. service.example.com is mapping to two ips. But when we update DNS to remove one of ips for service.example.com stunnel client still forward requests to both ips. How to make stunnel client to resolve domain name and refresh its cache? Here is stunnel configuration. sslVersion=TLSv1.2 cert = /etc/stunnel/stunnel.pem output=/var/log/stunnel.log [service-client] client = yes accept = localhost:4680 connect = service.example.com:4680 [service-server] client = no accept = 10.10.0.16:4680 connect = loclhost:80 Here is the resolving result for service.example.com. ;; ANSWER SECTION: service.example.com. 5 IN A 10.10.0.16 service.example.com. 5 IN A 10.10.0.8

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Sslkeylog
by tayyib ahmed 16 Aug '20

16 Aug '20

Hi Guys Is there any option to set sslkeylog to get ssl session id for stunnel session? Br xx

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Stunnel 5.56 Windows 10 Service - Not functioning after Reboot
by Rod Marr 16 Aug '20

16 Aug '20

Hi all, I have installed Stunnel 5.56 win64 on a fully updated Windows 10 machine to work with Blue Iris. Stunnel operates well when I manually start it however I cannot get it to work automatically after a reboot. I have run the run the “stunnel Service Install” and “stunnel Service Start” shortcuts supplied, and in the first instance the service installs and starts. I can then connect through Stunnel to my Blue Iris server. I have found that after I reboot, the Stunnel service appears to start automatically but it is not functional. I cannot connect through it to Blue Iris. Stunnel is visible and Running in the Windows 10 Services list (from services.msc) and the Windows Task Manager shows a Process and Service active. To rectify this I can manually issue the “stunnel Service Stop”, followed by the “stunnel Service Start” shortcuts and the service becomes functional again. I have tried turning on debug info and the stunnel log file in stunnel.conf and see that log entries only begin after I have done the stop/start manual process. Thanks for any insight to what I’m sure I am missing here. Rod Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10

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Sslkeylog
by Brent Kimberley 14 Aug '20

14 Aug '20

No sign of SSL_CTX_set_keylog_callback()... Date: Thu, 13 Aug 2020 16:44:22 +0100 From: tayyib ahmed <tayyib76(a)gmail.com> To: stunnel-users(a)stunnel.org Subject:Hi Guys Is there any option to set sslkeylog to get ssl session id for stunnel session? Br xx

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Timeout issues
by gorf＠hyperfunk.club 05 Aug '20

05 Aug '20

Hi, I'm using stunnel v5.56 on FreeBSD to proxy connections to a web server (running Apache), for a small number of users. Users connecting to the service keep running into issues with timeouts. I see timeout errors in the stunnel log messages: services stunnel[7510]: LOG3[188]: transfer: s_poll_wait: TIMEOUTclose exceeded: closing I tried changing stunnel to use the proxy protocol and enabled it on Apache, too. I don't know if that will help but at least then the web server gets the correct, remote IP address. Can anyone offer ideas/suggestions to fix this problem? Is there anything I can test or check to help diagnose the issue? The configuration is very basic: [apache] accept = 20888 protocol = proxy connect = 192.168.0.10:8000 PSKsecrets = /usr/local/etc/psksecrets.txt

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Getting incoming Exchange online (Office 365) emails to go to port 110 and not 995
by Brent Kimberley 23 Jul '20

23 Jul '20

Office365 IMAP4S + POP3S is dropping legacy authentication in favour of OAUTH2.0 authentication -- effective October 2020. (Some may have longer.) How do you you plan to migrate to authentication? Do you plan to upgrade your client(s) or inject an OAUTH2.0 transparent proxy ? ---------------------------------------------------------------------- Message: 1 Date: Thu, 23 Jul 2020 01:22:06 +0000 From: Mel Gilbert <m.gilbert(a)baymedicalgroup.com.au> To: "stunnel-users(a)stunnel.org" <stunnel-users(a)stunnel.org> Subject: Re: [stunnel-users] Getting incoming Exchange online (Office 365) emails to go to port 110 and not 995 Message-ID: <SY4P282MB074766F32238B92A3D951499C1760(a)SY4P282MB0747.AUSP282.PROD.OUTLOOK.COM> Content-Type: text/plain; charset="us-ascii" Hi Trying to get an application with inbuilt email to receive emails using POP and port 110. However we use Office 365 and I have tried below config but it is not working. I want people to send email to an Exchange Online Account port 995 and it gets forwarded on to the email app on port 110 client = yes output = stunnel-log.txt debug=7 taskbar=yes [POP3 Incoming] accept = 110 connect = Outlook.office365.com:995 cert = stunnel.pem [SMTP Outgoing] protocol = smtp accept = 25 connect = smtp.office365.com:587 cert = stunnel.pem The outgoing email works fine using SMTP relay that I've set up on Office 365 but cant get the incoming emails to work. Any help would be appreciated Thanks Mel

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Re: [stunnel-users] Getting incoming Exchange online (Office 365) emails to go to port 110 and not 995
by Mel Gilbert 23 Jul '20

23 Jul '20

Hi Trying to get an application with inbuilt email to receive emails using POP and port 110. However we use Office 365 and I have tried below config but it is not working. I want people to send email to an Exchange Online Account port 995 and it gets forwarded on to the email app on port 110 client = yes output = stunnel-log.txt debug=7 taskbar=yes [POP3 Incoming] accept = 110 connect = Outlook.office365.com:995 cert = stunnel.pem [SMTP Outgoing] protocol = smtp accept = 25 connect = smtp.office365.com:587 cert = stunnel.pem The outgoing email works fine using SMTP relay that I've set up on Office 365 but cant get the incoming emails to work. Any help would be appreciated Thanks Mel

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Transparent Proxy help.
by Steven Relf 21 Jul '20

21 Jul '20

Hello List, I am working on a small project where I need to encrypt nfs traffic, and Stunnel looks to be ideal, the only issue I'm having is getting the transparent part to work I have a client machine, running stunnel config below #GLOBAL####################################################### sslVersion = TLSv1.2 TIMEOUTidle = 600 renegotiation = no FIPS = no options = NO_SSLv2 options = NO_SSLv3 options = SINGLE_DH_USE options = SINGLE_ECDH_USE options = CIPHER_SERVER_PREFERENCE syslog = yes debug = 7 ;chroot = /var/empty/stunnel libwrap = yes service = 3d-nfsd curve = secp521r1 #CREDENTIALS################################################## verify = 4 CAfile = /etc/stunnel/nfs-tls.pem cert = /etc/stunnel/nfs-tls.pem #ROLE######################################################### client = yes connect = fqdn:2363 and the client which is running ontop of the nfs-ganesha server config below #GLOBAL####################################################### TIMEOUTidle = 600 renegotiation = no FIPS = no options = NO_SSLv2 options = NO_SSLv3 options = SINGLE_DH_USE options = SINGLE_ECDH_USE options = CIPHER_SERVER_PREFERENCE syslog = yes debug = 7 setuid = nobody setgid = nobody chroot = /var/empty/stunnel libwrap = yes service = MC-nfsd ; cd /var/empty; mkdir -p stunnel/etc; cd stunnel/etc; ; echo 'MC-nfsd: ALL EXCEPT 5.6.7.8' >> hosts.deny; ; chcon -t stunnel_etc_t hosts.deny curve = secp521r1 #CREDENTIALS################################################## verify = 4 CAfile = /etc/stunnel/nfs-tls.pem cert = /etc/stunnel/nfs-tls.pem #ROLE######################################################### connect = 127.0.0.1:2049 I have had a look through the documentation and I believe I need to set transparent = source on the client side, and then set some ip tables firewall rules. Does anyone have a guide, or some advice on how to get this to work. Generally what happens if I set the firewall rules, on the client, and set the transparent to source I just get connection closed by remote host. I never actually see the traffic leave the client host. To confirm, when not using transparent everything works correctly, accept the server side sees the connection coming from 127.0.0.1 Thanks Rgds Steve. The future has already arrived. It's just not evenly distributed yet - William Gibson Steven Relf - Technical Authority: Cloud Native Infrastructure srelf(a)ukcloud.com +44 1252 936019 / +44 7500 085 864 www.ukcloud.com A8, Cody Technology Park, Ively Road, Farnborough, GU14 0LX Notice: This message contains information that may be privileged or confidential and is the property of UKCloud Ltd. It is intended only for the person to whom it is addressed. If you are not the intended recipient, you are not authorised to read, print, retain, copy, disseminate, distribute, or use this message or any part thereof. If you receive this message in error, please notify the sender immediately and delete all copies of this message. UKCloud reserves the right to monitor all e-mail communications through its networks. UKCloud Ltd is registered in England and Wales: Company No: 07619797. Registered office: Hartham Park, Hartham, Corsham, Wiltshire SN13 0RP.

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Used Multi Service
by Ramin Malekgahsemi 09 Jul '20

09 Jul '20

Hi Dear Friends I used Stunnel 5.49 32 bit For server This Config cert = C:\Program Files\stunnel\config\stunnel.pem fips = no [socks] accept = 443 connect = 1010 If define New Service For example cert = C:\Program Files\stunnel\config\stunnel.pem fips = no [s1] accept = 443 connect = 1010 [s2] accept = 445 connect = 1020 Service Not work How Solve This Problem THX

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Re: [stunnel-users] winsock permissions issue (i.e. WSAEACCES 10013 / 0x271D)
by flash＠vicsmba.com 29 Jun '20

29 Jun '20

It will never be entirely random. Some range more than likely. You may be able to restrict the range. You could certainly set stunnel up for each “random” port. E VICS, LLC Eric S Eberhard 2933 W Middle Verde Rd Camp Verde, AZ 86322 928-567-3727 (land line) 928-301-7537 (cell phone) http://www.vicsmba.com <http://www.vicsmba.com/> https://www.facebook.com/groups/286143052248115 From: stunnel-users <stunnel-users-bounces(a)stunnel.org> On Behalf Of Brent Kimberley Sent: Friday, June 26, 2020 4:11 PM To: Thomas Ward <teward(a)thomas-ward.net>; stunnel-users(a)stunnel.org; Coviello, Paul <pcoviello(a)ccsusa.com> Subject: Re: [stunnel-users] winsock permissions issue (i.e. WSAEACCES 10013 / 0x271D) What are you trying to accomplish? I.e. Is TLS the best wrapper for the job? (i.e. TCP over TCP.) On Thursday, June 25, 2020, 11:44:38 a.m. EDT, Coviello, Paul <pcoviello(a)ccsusa.com <mailto:[email protected]> > wrote: Maybe, I also just found out that the port it goes out is not what I thought it was. It’s a random port. Not sure if it’s doable now. Thanks for your help

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winsock permissions issue (i.e. WSAEACCES 10013 / 0x271D)
by Brent Kimberley 26 Jun '20

26 Jun '20

Hi Paul. With respect to your winsock permissions issue (i.e. WSAEACCES 10013 / 0x271D), did you open the port in your firewall and authorize communication via anti-virus? > Hi I have a windows 10 machine that I?ve got this running on, and the > screen shot below is what I keep getting and I am unable to find the issue, > > Can someone please shed some light as to what is wrong? And what else you may need.

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