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.

learn more… | top users | synonyms

12
votes
2answers
8k 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 ...
9
votes
1answer
15k 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 ...
27
votes
5answers
7k 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 ...
5
votes
1answer
164 views

Is it possible to configure IIS to redirect based on the SSL cipher suite used for the connection?

With the announcement of POODLE, I would like my servers to accept SSL3.0 connections but have them serve a page which indicates that the user should update to a newer browser with TLS support. It ...
3
votes
0answers
44 views

LDAP over TLS fails to connect, Schannel Alert 48

I am trying to use PHP to edit users in active directory through LDAP. My test machine is using a simple WAMP setup and is NOT connected to the windows domain. This machine can connect to LDAP on the ...
0
votes
1answer
298 views

How to check what features mail server supports?

just curious if there any tool that I can just give a mail server address/ip to and that would give me all features that mail server supports. Like: does it support imap/pop3? Does it support ...
30
votes
5answers
24k views

What are the exact protocol level differences between SSL and TLS?

This is a technical deep dive after this overview question was asked. What are the protocol differences between SSL and TLS? Is there really enough of a difference to warrant a name change? (versus ...
18
votes
1answer
18k views

How to inspect remote SMTP server's TLS certificate?

We have an Exchange 2007 server running on Windows Server 2008. Our client uses another vendor's mail server. Their security policies require us to use enforced TLS. This was working fine until ...
12
votes
2answers
28k views

How to enable TLS 1.1, 1.2 in IIS 7.5

We want to support web browsers utilizing TLS 1.1 and 1.2, which has been apparently implemented by Microsoft, but is turned off by default. So I went searching on Google and discovered some pages ...
8
votes
1answer
4k views

Postfix TLS over SMTP - RCPT TO prompts renegotiation then 554 5.5.1 Error: no valid recipients

I've setup ispconfig3 on my debian six server, and here is a little smtp over ssl: The server is postfix AUTH PLAIN (LOL!) 235 2.7.0 Authentication successful MAIL FROM: lol@lol.com 250 2.1.0 Ok ...
9
votes
2answers
9k views

How to disable TLS 1.1 & 1.2 in Apache?

I have an Ubuntu 12.04.2 LTS server running Apache 2.2.22 with mod_ssl and OpenSSL v1.0.1. In my vhosts config (everything else within which behaves as I would expect), I have the SSLProtocol line ...
8
votes
4answers
13k views

Is STARTTLS more safe than TLS/SSL?

In Thunderbird (and I assume in many other clients, too) I have the option to choose between "SSL/TLS" and "STARTTLS". As far as I understand it, "STARTTLS" means in simple words "encrypt if both ...
8
votes
5answers
8k views

What is TLS and how does it compare to SSL?

Is TLS the "new" version of SSL? What features does it add, or security issues does it address? Can anything that supports SSL support TLS? What would be involved in making the switch? Is the ...
7
votes
4answers
10k 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 ...
6
votes
3answers
9k 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
votes
2answers
6k 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 ...
3
votes
1answer
481 views

IIS 7.5 and above - enable schannel cipher DHE_RSA_AES_128_GCM following patch KB2992611 - Is this safe?

I recently became aware that following the release of patch KB2992611 in November, Microsoft made available four new cipher suites for schannel (and thus IIS); TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 ...
3
votes
1answer
602 views

2008 R2 TLS 1.2 enabled in registry, rebooted, but not functioning

Yes, I rebooted the server. Several times. This actually affects both TLS 1.1 and 1.2. The only one currently working is 1.0. I followed the instructions here: http://support.microsoft.com/kb/245030 ...
2
votes
2answers
706 views

Redirect browser based on non-negotiable SSL/TLS protocol or cipher

I’m just one of the many many users of the SSL/TLS protocols on a HTTPS site. For good security reasons I'd like to restrict the TLS negotiation to minimum TLS1.1 with AES ciphers. Reasons are ...
2
votes
2answers
414 views

How do I log tls-encrypted smtp traffic?

I'd like to know what my local postfix says to the Amazon SES smtpd after the STARTTLS. In plain text, so I can understand it. Amazon SES requires TLS, so I can't temporarily turn it off. I currently ...
1
vote
1answer
240 views

Outlook/Exchange certificate errors after setting clientaccessserver, etc… properties

After updating exchange 2010 using the commands for Set-ActiveSyncVirtualDirectory, Set-ClientAccessServer, Set-ECPVirtualDirectory, Set-OABVirtualDirectory, Set-OWAVirtualDirectory, & ...
1
vote
3answers
273 views

How to force a own set of ciphers in Postfix 2.11?

I would like to force a own set of TLS cipher suites rather than use the Postfix built in ones. My desired set of ciphers is (taken from nginx configuration): ...
0
votes
1answer
347 views

Weblogic Mitigate POODLE vulnerability after upgrade and still use CBC ciphers

I recently upgraded my Weblogic server to 10.3.6 with java 7. So with that I have TLS1.0 - TLS 1.2 enabled via the setEnv.sh. Some of the ciphers I am using to make sure that they are compatible ...
5
votes
2answers
12k 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 ...
5
votes
1answer
1k 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 ...
5
votes
3answers
2k 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 ...
4
votes
2answers
3k views

OpenLdap TLS authentication setup

I am trying to setup openldap on ubuntu 12.04 by following this guide https://help.ubuntu.com/12.04/serverguide/openldap-server.html When I tried to enable TLS on the server by creating a self signed ...
4
votes
1answer
2k views

Exim TLS and Secure SMTP

I'm in the process of converting an existing mail server to support encrypted SMTP for our clients, but I've run into this brick wall with very little useful log data to help me forward. Everything ...
3
votes
1answer
2k views

If I get a certificate signed for ECDSA will older browsers be able to use RSA?

I'm looking into using ECDHE-ECDSA and there are a lot of great articles on why (https://hynek.me/articles/hardening-your-web-servers-ssl-ciphers/) and ...
3
votes
3answers
3k views

Configuring IIS 7.5 to be FIPS 140.2 compliant

I need to configure IIS 7.5 (Server 2008 R2) to be FIPS 140.2 compliant. Specifically, this involves disabling all SSL protocols other than TLS 1.0. I have set the following registry keys: ...
2
votes
2answers
4k views

Disable all but RC4 in apache

Our PCI compliance vendor requires that we disable all but RC4 encryption on our web server. Currently our apache config file looks like this: SSLHonorCipherOrder On SSLCipherSuite ...
1
vote
1answer
41 views

TLS Error: Handshake failed. Openvpn Server is behind NAT on dynamic ip

this is a common problem that appears easily in searches and seems to be related to the firewall , yet I can't seem to figure out how to fix it. I have actually asked before, but this time I come back ...
1
vote
0answers
158 views

openvpn TLS handshake fails on client because firewall drops packets (but why?)

I seem to have problem with my openvpn server - client connection. now, the important information is in the log (verb3) of my client: Mon Mar 30 17:09:59 2015 OpenVPN 2.2.2 ...
1
vote
2answers
2k views

Disabled SSLv3 to combat Poodle now cannot connect to SQL “Connection forcibly closed by remote host”

I have disabled SSL3 on my web server to combat the Poodle Vulnerability and now I am unable to connect to my SQL server using SQL Authentication. I just get "Connection forcibly closed by remote ...
1
vote
2answers
825 views

iptables only allow smtp connections with start tls

Is it somehow possible to block/abort unencrypted smtp connections with iptables? effectively rejecting all connections which dont do a start tls.
1
vote
2answers
126 views

VPN Security Versus Plain Old TLS

We want to expose a web-app over the Internet. The obvious solution is to make it available over HTTP with TLS and RBAC. Would locking access down even further through the use of a VPN enhance ...
0
votes
2answers
3k views

Do I have to enable TLS 1.0 in windows 2008 R2?

Do I need to enable TLS 1.0 in Windows Server 2008 R2, or is it enabled by default? I did search and found out that TLS 1.1 and 1.2 is supported but disabled by default. How about TLS 1.0? I tried ...
0
votes
1answer
855 views

obtaining nimbuzz server certificate for nmdecrypt expert in NetMon

I'm using Network Monitor 3.4 with the nmdecrypt expert. I'm opening a nimbuzz conversation node in the conversation window and i click Expert-> nmDecrpt -> run Expert that shows up a window where i ...