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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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 ...
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1answer
15k 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
66 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
2k views

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
219 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 ...
7
votes
4answers
9k 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
390 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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1answer
301 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
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0answers
124 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 ...
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0answers
136 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 ...
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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
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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: ...
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1answer
770 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
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1answer
1k 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 ...
3
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2answers
5k 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
619 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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2answers
6k 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: ...
2
votes
3answers
7k 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 ...
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2answers
470 views

Do I need to buy SSL certificate for root domain?

I am currently using single SSL cert (non-wild card) on www.example.com, what I found that even if I access the file without the www part, e.g. https://example.com/test.js There is no browser ...
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1answer
230 views

Can't send mail through ssl with my virtual domains from an external webmail

I having issues with postfix to send mail through SSL from an external webmail. I have several domain setup on my server configured in postfix with mysql. When I send mail with my main domain ...
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0answers
51 views

here filtering terminate TLS in openvpn but not ssl

I have configured an openvpn sever appliance on vmware and windows 2008 R2 and set it to use port 80 for openvpn, iphone and ipad could connect to it but windows and mac could't and generated error in ...
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2answers
2k views

OpenVPN TLS key negotiation failed

I've setup my OpenVPN server and client before and it works perfect last month. But now i can't connect to the server without any config changing. Here's the cilent side log(Win7): Mon Feb 18 ...
2
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3answers
260 views

ldap does not respond to ldapsearch with -ZZ parameter

I have followed the instructions found here up to the point where ldapsearch is executed with -ZZ. The problem is after executing ldapsearch with -ZZ, there is no more response. Is there any step ...
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0answers
377 views

Disabling TLS in IIS 5 (Window 2000)

I am trying to disable TLS 1.0 in my IIS 5.0, which runs on Windows 2000. I followed the MS instructions (http://support.microsoft.com/?id=187498), but when I checked the traffic with WireShark the ...
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1answer
1k views

IBM Domino 8.5.3 and mitigating the BEAST attack on TLS (SSLTest)

Having run https://www.ssllabs.com/ssltest/index.html on a newly built Domino 8.5.3 server, is it possible to configure for ...
0
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1answer
92 views

What decides what tunnels inside EAP-TTLS?

If EAP-TTLS is a EAP method that establishes a TLS tunnel, what goes in the tunnel? It could be another EAP method, but it could also be PAP. What decides? The server, the supplicant, or do they ...
8
votes
1answer
13k views

How to disable SSLCompression on Apache httpd 2.2.15? (Defense against CRIME/BEAST)

I read about the CRIME attack against TLS Compression (CVE-2012-4929, CRIME is a successor to the BEAST attack against ssl & tls), and I want to protect my webservers against this attack by ...
5
votes
1answer
11k views

Disable SSL / TLS compression in Apache 2.2.x

Is there a way to disable SSL/TLS Compression in Apache 2.2.x when using mod_ssl? If not, what are people doing to mitigate the effects of CRIME/BEAST in older browsers? Related Links: ...
0
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1answer
298 views

Removing “noplaintext” from Postfix conf due to lack of CRAM-MD5 support in clients. Is that insecure?

I have enabled TLS support in POSTFIX and authentication is delegated to Dovecot which offers "plain login cram-md5" methods. The SASL section in my Postfix conf had smtpd_sasl_local_domain = ...
1
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2answers
239 views

TCP_NODELAY for an SSL tunnel?

I'm tunneling an HTTP connection over stunnel. The client side does not natively support HTTPS, so stunnel in client mode is used. Would setting TCP_NODELAY=1 help responsiveness in typical web ...
1
vote
2answers
560 views

ldapsearch -ZZ hanging

I have just setup Openldap using the following instructions http://www.computerglitch.net/bin/texts/CentOS6_LDAP.php The normal connection returns what is expected but the tls test just hangs. Any ...
7
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3answers
6k views

What's the difference between: Verisign Thawte Geotrust Rapidssl certs?

Verisign owns all these certificate issuing companies: Verisign Thawte Geotrust and Rapidssl. What is the difference between them and why is the price difference so great? Update: Here are just a ...
6
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3answers
8k views

Require TLS on RDP for all connections

I have a 2008 DC and a 2008 AD CS server and a Windows 7 client. What I would like is to require the certificate to be used when RDPing to the server. The certificate is valid, and if I connect ...
2
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1answer
329 views

LDAP expired SSL certificate

The SLL certificate on the LDAP server expired recently, making it impossible to ssh into other Linux machines who relay strictly on LDAP. Being a self-signed certificate, my understanding is that it ...
1
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1answer
239 views

slapd 2.4.23 hangs on ldaps connections

New install of CentOS 6.3, openldap-servers-2.4.23. Generated a new certificate request, signed the cert, started slapd. ldapsearch responds on ldapi:/// and ldap:///. However, as soon as a request is ...
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2answers
1k views

Exchange - inbound email only works from some servers

I am having a problem where inbound mail from outside only works when sent from certain hosts. For example, when I send myself an email from my personal gmail account all is well, as the logs show: ...
10
votes
2answers
6k views

Configure OpenLDAP with TLS=required

Nowadays, OpenLDAP needs to be configured with ldapmodify cn=config, as describe here. But nowhere I can find how you configure it to only accept TLS traffic. I just confirmed that our server accepts ...
1
vote
1answer
416 views

Is it possible to configure sendmail to require/use certain ciphers during TLS negotiation?

CentOS 5.x | SendMail I'd like sendmail to use a specific cipher when negotiating a TLS session with a specific remote MTA/domain. Is that possible? I'm aware that a minimum bit strength can be ...
1
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1answer
643 views

Two Exchange 2003 servers, Internet SMTP Connector using port 587 on smarthost: no longer internal connectivity between the Exchange servers

To summarize: I set things up (this is a virtual test/tutoring environment), broke internal connectivity by introducing Internet mail connectivity, figured out where the problem was, but now I'm ...
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2answers
2k views

Does Exchange 2010 encrypt inbound and outbound email traffic by default?

The higher ups have recently asked about this as I'm sure there are compliance issues that need to be addressed. I was under the assumption that Exchange uses opportunistic TLS or StartTLS to try to ...
3
votes
1answer
420 views

BEAST (Browser Exploit Against SSL/TLS) Vulnerability on Port 25 for Postfix

I am failing a PCI Compliant scan. I have successfully used RC4 ciphers for Apache setup but my Postfix configuration is still not fixed. What TLS configuration should i use in my main.cf file. my ...
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2answers
3k views

What might cause https failure when not specifying SSL protocol?

I have a VBScript program that retrieves a web page from a server not under my control. The URL looks something like https://someserver.xxx/index.html. I use this code to create the object that does ...
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2answers
8k views

Postfix Send Error: Must Issue STARTTLS command

Running Ubuntu 12.04 and trying to configure postfix to relay send and receive through GMAIL. Am running into connection issues particularly with TLS. Have tried a bunch of troubleshooting solutions ...
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0answers
208 views

openSuse and openldap:ldap only login

I 've managed to setup ldap server and i can search it succefully from the server machine. i ve added to the database all info except from the fstab file and automount info. I migrated succefully the ...
4
votes
1answer
905 views

postfix TLS configuration for incoming gmx-mail

I set up my mailserver with postfix 2.7.1 and dovecot 1.2.15 and everything seemed to work just fine, but now I found out that people using @gmx.net addresses cannot send emails to me and rather ...
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1answer
93 views

SSL on mail server

A client of the company i work for asked if the email we provided them along with their domain will be SSL / TLS encrypted. We use qmail. What should I check to tell the client for sure that their ...
0
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2answers
467 views

IPTables Rule for Google Apps SMTP

I am trying to add iptables rule to allow traffic on ports 465 & 587 to google apps smtp servers. But I got not luck. My WHMCS installation works fine with google apps when I turn off iptables but ...
26
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5answers
6k views

Functional implications of differences in SSL and TLS

I know that TLS is essentially a newer version of SSL, and that it generally supports transitioning a connection from unsecured to secured (commonly through a STARTTLS command). What I don't ...