Transport Layer Security is a cryptographic protocol for encrypting and authenticating network communications, and replaces SSL. It is commonly used to secure Internet protocols such as HTTP.

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Exchange: use Port 110 for both POP3 & POP3/SSL?

On our Exchange 2010 POP3 is configured to only allow secure logon (TLS connection for authentification). Now, the default port for "plain" POP3 is 110, and for POP3 with SSL is 995, hence with the ...
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49 views

In an Inbox rule in Outlook, is it possible to determine that an email was sent as Domain Authenticated (Mutual Auth TLS)?

Background I have successfully configured Domain Authenticated (Mutual Auth TLS) email between my company (Exchange 2007) and a client (Exchange 2010). This gives us a green tick on emails from ...
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2answers
370 views

Postfix, TLS and StartSSL certificates

I recently changed my postfix installation to use TLS with a certificate issued by StartSSL. I then ran SMTP and TLS checks with no errors or warnings. Everything seemed to work fine. My problem now ...
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2answers
274 views

How can I (securely) get remote desktop back?

In order to make compliance with our PCI-DSS requirements, I was required to disable TLS 1.0 (apparently it has a flaw that was corrected in TLS 1.1 and higher). However, after doing so, remote ...
2
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2answers
2k views

Postfix: Allow unauthenticated incoming mail, but only authenticated outgoing mail?

I'm new to the world of mail server's and have been working on setting up my own via Postfix on Ubuntu 11.10. So far, I have SASL authentication working over TLS so that's good; I'm worrying about ...
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3answers
1k views

What percentage of web users are running on browsers/OSes that support SNI? [closed]

Has anyone done any analysis (or know where I can find some!) on what proportion of internet users are using a browser/operating system combination that support SNI (Server Name Indication) SSL/TLS ...
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1answer
417 views

Disable STARTTLS on Qmail for outgoing messages [closed]

I've a Plesk 10.5 server with QMAIL as MTA. We are facing issues when sending e-mail to certain domains and I would like to know if you guys know how to disable STARTTLS when sending e-mail through ...
3
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3answers
560 views

Postfix TLS authentication not enabled

Hi I've set up a mail server according to this guide : http://andrewpuschak.com/dokuwiki/doku.php?id=centos_6_email_server When I telnet mydomain.com 25 and use the AUTH command it returns: Error: ...
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0answers
67 views

Get and set the certificate used by Exchange with port 587 (submission)

Sometimes users want to use POP3/SMTP with Exchange. They report that there is certificate issue with sending mail as the server uses the domain certificate for encryption. Of course I could install ...
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1answer
3k views

linux ssmtp error Cannot open smtp.gmail.com:587

I can not route may emails vie gmail.com. I use ssmtp facility. My config files in /etc/ssmtp are root:yyyyy@gmail.com:smtp.gmail.com:587 maciek:yyyyy@gmail.com:smtp.gmail.com:587 and ssmtp.conf: ...
3
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1answer
117 views

Postfix: set up outgoing server to server encryption

I'm trying to configure postfix that it sends a mail encrypted with TLS to the recipient server. What I have: receiving mails encrypted (other server -> my server) and users can connect encrypted to ...
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2answers
307 views

openldap cacerts directory symbolic link to /etc/pki/tls/certs - Yes/No? Why?

Every single article/how-to/blog on openldap talks about putting the ldap cert for ldaps in the /etc/openldap/cacerts directory. I am wondering why not just put the cert(s) in /etc/pki/tls/certs and ...
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1answer
59 views

Does Postfix need a TLS cert for every destination domain?

When Postfix is the destination for multiple domains, does it need a TLS cert for every one of them, or just for the domain in $myhostname? That is to say, are there smtp clients out there who will ...
6
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2answers
776 views

Display a TLS icon for messages that are TLS secured (Outlook)

One of my colleagues at a large financial institution has customised Lotus Notes to show a TLS icon for messages that are TLS secured. I'm interested in imitating this feature in Outlook, and believe ...
5
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2answers
6k views

SSLCipherSuite - disable weak encryption, cbc cipher and md5 based algorithm

A developer recently ran a PCI Scan with TripWire against our LAMP server. They identified several issues and instructed the following to correct the issues: Problem: SSL Server Supports Weak ...
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0answers
57 views

How can I test connectivity to a TLS-enabled OpenVPN server?

Unfortunately we don't have access to the management interface, so I'm after a way to tell that tls-enabled OpenVPN us up and responsive. I'm familiar with this trick, but it doesn't work for ...
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1answer
506 views

PURE-ftpd + passive mode + TLS

Could you please help me with settings of pure-ftpd. Here is my actual solution: I have got linux (debian 7.1 wheezy ), where I run pure-ftpd, created virtual users, folder for ftp. I also ...
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2answers
90 views

Exim forwards not going out through TLS

I'm trying to get Exim to use STARTTLS to send emails that are just FORWARDS. I have a server accepting email at example-accepting.com for users. So I want user@example-accepting.com to forward all ...
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3answers
743 views

smtpd_tls_auth_only exclude 127.0.0.1

I configurated postfix to force uses TLS. When an external client try to send an email using this server there is not any problems. But using webmail (127.0.0.1) postfix wants TLS: delivery ...
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2answers
500 views

Is there a way to make TLS work with rsyslog in Ubuntu 12.04?

I configure rsyslog to load the TLS module (to talk to loggly) and I'm getting this error: Jun 20 13:14:00 feynman rsyslogd-2068: could not load module '/usr/lib/rsyslog/lmnsd_gtls.so', rsyslog error ...
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2answers
5k views

pure-ftpd gives wrong ip for passive connection in TLS mode

I am setting up our ftp server ( pure-ftpd-1.0.21-r1 ) to use TLS/SSL. It works when I don't use TLS. Started with command options: -S 21 -c 30 -C 10 -B -k 90% -A -R -Z -p 49152:65534 -U 013 -s ...
2
votes
1answer
4k views

OpenVPN Error : TLS Error: local/remote TLS keys are out of sync: [AF_INET]

Fist off thanks for reading this, I appreciate any and all suggestions. I am having some serious problems reconnecting to my OpenVPN client using Riseup.net's VPN. I have spent a few days banging my ...
2
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2answers
118 views

Postfix: Enforcing outbound TLS based on sender and receipient domain?

I know that it is fairly trivial to enforce TLS based on the recipient domain by using smtpd_enforce_tls. I have a use case where I need to enforce TLS to certain recipient domains based on the ...
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1answer
274 views

Encrypt connection to Spice console in browser using HTML5 Spice client

At the moment i'm testing a way to connect to my VMs running on kvm-servers using spice and a browser html5 spice client I found. It was easy to set up, following this guide: ...
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1answer
50 views

Forcing dovecot to use TLS doesn't work

I look for a way to enforce a lamba user to connect to dovecot server with TLS. I followed the documentation http://wiki2.dovecot.org/SSL/DovecotConfiguration , and I edit the dovecot configuration ...
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1answer
537 views

Nginx: Disable gzip-compression for http only

Because of the BREACH vulnerability I'd like to disable gzip compression for TLS traffic, but not for regular HTTP traffic. I could split up every Nginx server section into two separate TLS- and ...
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1answer
102 views

What are the effects of having the TLS certificate and private key in same file?

I have noticed that a number of different web and mail server software allow or require you to provide the TLS certificate (including server certificate, CA intermediate certificate, and CA root ...
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1answer
48 views

Import TLS certificate tu use LDAPS on client machine

I installed OpenLDAP server and I configurated TLS on the same machine (CentosOS 5) . Now I would to use LDAPS from an other machine: How can I import the generated certificate? I used this to enable ...
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0answers
61 views

How to enable TLS on OpenLDAP

I use CentosOS 5. I have a problem to enable TLS (or ssl) on OpenLDAP server. I followed this tutorial... so: I generate the cerificates; I setted the path in sladp.conf TLSCertificateFile ...
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2answers
2k views

how to enable TLSv1.1 and TLSv1.2 on nginx Debian squeeze?

For security I have to setup a nginx server with TLSv1.1 or TLS v1.2. By default, nginx configuresTLSv1. Reading the documentation I see that nginx has to set the following directive: ssl_protocols ...
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3answers
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Postfix & TLS is configured correctly, but Thunderbird throws cryptic errors when trying to send email via SMTP & STARTTLS?

I've just recently installed CentOS 5.5 and Postfix for the first time ever. I've followed 2 different tutorials which are supposed to enable TLS on the SMTP server. Both of which told me to create a ...
0
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1answer
11k views

Lync & TLS: Event 36874 - how to handle?

Setting up a new Lync 2013 install in the Company Network I got everything nearly working except Client Login. here seems to be a mismatch of capabilities or some Settings in the TLS area - ...
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1answer
61 views

Do any well-known CAs issue Elliptic Curve certificates (now that all others are hackable)? [closed]

I know it had been asked before here, but that was back in 2009. Now that it is widely supported by browsers (Requires TLS 1.1, only added in Chrome 22+, FF 23 released Aug 8 2013, IE9+), AND can ...
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1answer
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OpenSSL and TLS 1.1 and TLS 1.2 - should i update? [closed]

Debian 6s openssl from apt-get is still on 0.9.8 (2010) and doesnt support TLS 1.1 and TLS 1.2. Is there anything why i should not update to the latest stable 1.0.1e ? Or, which build would u ...
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0answers
175 views

Set Windows Server 2008 R2 SMTP for Opportunistic TLS

I use a Windows 2008 R2 server for sending (relaying) outbound emails to clients. Many of these clients are now requiring TLS connections to send them email. To date I have set up a an SMTP "Remote ...
6
votes
4answers
7k views

Disable SMTP AUTH on Port 25

Due to PCI-DSS, we are required to disable plaintext authentication. We've achieved this by encapsulating communications between our mail server and clients with TLS on port 465. The problem lies in ...
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0answers
335 views

Storing GPG keys in LDAP with TLS using gpgme

I'm trying to send my GPG public key to our LDAP server, but I'm hitting a wall. My LDAP server only allows LDAP with Start_TLS over port 389, or LDAPS on port 636. I've got the following lines in my ...
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votes
1answer
247 views

How to do Postfix accept outgoing mail from another internal servers

I have a MTA with Postfix SSL/TLS configured and sending messages perfectly fine. In the same internal network, I have other servers that I want to send mail through this MTA. In main.cf variable ...
2
votes
0answers
112 views

SSLv2 required on TLS-only site?

This problem has been driving me crazy for a very long time. We have three web servers, serving East, West and Central offices. We built the Central server first, imaged it, and copied the image to ...
0
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0answers
111 views

Cannot recieve incoming mails from google-based mail services

I use XMail v 1.27 as our SMTP server and openssl v 0.9.8m (prebuilded in XMail distr). Recently I've configured XMail to support SSL/TLS. I already had chains of certificates (one for QA environment ...
4
votes
5answers
4k views

LDAP over SSL/TLS working for everything but login on Ubuntu

I have gotten OpenLDAP with SSL working on a test box with a signed certificate. I can use an LDAP tool on a Windows box to view the LDAP over SSL (port 636). But when I run dpkg-reconfigure ...
6
votes
4answers
3k views

SSL connection errors from Apache

I'm running a (self-signed) SSL cert site on Apache/2.2.14 on Ubuntu 10.04, but various browsers are giving errors on half the connection attempts. Just now saw this transient error from Chrome: ...
0
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1answer
588 views

OpenLdap 2.4 on centos 6 doesn't listen on port 636

I have an openldap 2.4 server on centos 6 whose confg I copied from those I have running under openldap 2.3 servers on centos 5 machines. On openldap 2.3, specifying TLSCACertificateFile, ...
3
votes
1answer
896 views

What exactly does the “Proxy TLS” option do on Blackberry handhelds and how does it affect data traffic from the mobile device to BES?

Blackberry OS 7.0 | BES 5.x | AT&T Can someone please explain what the "Proxy TLS" option does (under blackberry device menus Options >> Security >> Advanced Security Settings >> TLS >> Proxy ...
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2answers
3k views

None of the cipher suites supported by the client application are supported by the server

I am getting this error in my server's windows event log: An TLS 1.0 connection request was received from a remote client application, but none of the cipher suites supported by the client ...
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0answers
399 views

Access Denied for Specific FTP Client

I have a couple FTP servers setup which I am unable to access using a particular client machine. The client is a Windows 2012 server in my company's network over which I do not have admin rights. ...
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1answer
1k views

Cyrus can't connect via SSL/TLS

I made a key with sudo openssl req -new -x509 -nodes -out /etc/ssl/certs/imap.pem -keyout /etc/ssl/private/imap.key -days 365 and then I make chown cyrus /etc/ssl/certs/imap.pem and chown cyrus ...
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votes
2answers
5k views

Postfix & Gmail: Authentication Required error

I configured Postfix using this guide. When I send a test E-Mail I get the following error message: May 23 15:36:26 VM11 postfix/smtp[15321]: connect to smtp.gmail.com[2a00:1450:4001:c02::6d]:587: ...
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vote
3answers
6k views

How to configure sendmail to relay emails through Office 365 (SMTP) with TLS

I have a box running RHEL 6.3 and there's and application that needs to send out reports by mail, in order for this functionality to work I have to have mail configured in my box. In addition I ...
2
votes
2answers
1k views

postfix warning - unused parameter: start_tls= yes

I am a front-end developer and am managing my own linux server for the first time. I'm running Ubuntu 12.04 LTS, and have an SSL certificate. Using Google apps mail as my mailserver, and SendGrid to ...