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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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 ...
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2answers
118 views

SSL cipher suite usage statistics based on captured data

Is there a reasonable method of building SSL cipher usage statistics based on captured packets? Let's say my web server supports a set of ciphers and I would like to find out how many clients ...
11
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3answers
10k views

Fixing BEAST vulnerability on Apache 2.0 running on RHEL 4

I have a web server running Apache 2.0 on RHEL4. This server recently failed a PCI scan. Reason: SSLv3.0/TLSv1.0 Protocol Weak CBC Mode Vulnerability Solution: This attack was identified in 2004 and ...
2
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2answers
492 views

How to set up TLS on hMailServer?

Complete noob here. Please be gentle :) I have a Windows 2008 server, running hMailServer. Right now all my communication is unencrypted. I want to start using TLS. So now I've got myself a SSL ...
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1answer
41 views

SMTP doesn't work on distinct machine [closed]

I'm trying to setup TLS e-mail on remote machine, but it doesn't work. Trying to send e-mail on my local machine (Windows 7 x64 locale ru-ru): 16:33:18 CONNECT : Looking up host name ...
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2answers
87 views

Is it necessary to purchase an OID for ADCS?

I am interested in utilizing ADCS to generate trusted certificates for internal web applications. However, from my readings it appears that I need to purchase an OID, which looks pretty expensive. Is ...
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0answers
117 views

How to configure HAProxy to use SNI for SSL enabled backends?

I have several backend web servers that have multiple vhosts and I want to use HAProxy in front of them. It doesn't appear that HAProxy is sending the hostname in the TLS connection to the backend ...
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1answer
187 views

Problem with TLS identity not verified

I run a CA server "Microsoft CA Server Enterprise" and I generate certificates then bind the cert to my site. In all clients in my network, I add the cert with certutil -addstore ca org.cer When my ...
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1answer
63 views

Confused about SSL certificates needed for Windows proxy

I am completely new to security, and I'm confused about what kind and how many SSL certificates I need. I have a REST API server running on a windows server 2012. It's currently listening to HTTP ...
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2answers
83 views

Exim log file errors

1- What is the meaning of these lines in /var/log/exim/main.log? I have these lines repeated more than 700 times in main.log 2015-03-16 21:30:57 TLS error on connection from [192.0.2.1] ...
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1answer
435 views

Postfix STARTTLS only on port 25

I want to enable STARTTLS on port 25, but for unknown reasons it only works on port 465. master.cf: smtp inet n - - - - smtpd -o syslog_name=postfix/smtp -o ...
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 ...
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0answers
82 views

gandi sendmail tls slow

I set up a Debian with Sendmail && SSMTP to be able to send mail through my Gandi Mail Account. It works fine, except that the authentication took like 5 seconds to be established which can ...
0
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2answers
2k views

Nessus Security Vulnability Fix: SSL Version 2 (v2) Protocol Detection

Below, in quotes, is a medium severity issue discovered after scanning an IIS web server, with a tool called Nessus. "Consult the application's documentation to disable SSL 2.0 and use SSL 3.0, TLS ...
3
votes
3answers
87 views

Why is Android / IE using 3DES when AES is available?

I have a Zimbra installation and want to harden the cipher suites. I disabled some and am quite OK with what is left. The problem now is that the Qualys SSL test shows a lot of clients will use 3DES, ...
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1answer
81 views

How to create certificates for local network

I have a local network (a intranet of about 50 to 70 computers) where is a Windows Server 2008 with a ASP.NET MVC application. To encrypt the connection with HTTPS i need a server certificate (not ...
6
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1answer
153 views

Can I detect if the SSL client doesn't support Server Name Indication and provide the standard HTTP website in that case?

I will need to use SSL SNI, but unfortunately from a recent Cloudflare blogpost only 90% of the network supports it. How can I (for example, with nginx) detect if the client supports SNI and ...
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0answers
56 views

TLS server extension

We have an Ubuntu 12.04 server with Tomcat and Nginx webservers on it to serve two different portals. Tomcat is serving on 443 port and Nginx is serving on 8443 port. And this server got latest ...
8
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2answers
494 views

How widely supported is forced TLS on inbound SMTP connections?

I run an MTA consisting of the standard Postfix, SpamAssassin, ClamAV, SPF/DKIM checks etc. This MTA is used for inbound email only, doesn't host any accounts and forwards any mail that passes said ...
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1answer
620 views

Plesk 10 Postfix with multiple IP adresses and SSL certificates [closed]

We are currently running a root server with Debian 6 and Plesk 10.4.4. We have some virtual hosts using one IP adress (shared) - e.g. example1.com - and another virtual host using a dedicated IP ...
1
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1answer
660 views

How to Disable TLSv1.0 and TLSv1.1 in Nginx

I'm trying to figure out how to disable TLSv1 and 1.1 Nginx and ONLY allow connections on 1.2. This is for testing reasons more than in production use and for the life of me cannot figure out why ...
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0answers
69 views

HTTP DoS prevetion with UFW firewall

I am trying to creator an HTTP DoS attack on my servers using UFW firewall using this Resource. I edited /etc/ufw/before.rules to get the following rules. # # rules.before # # Rules that should be ...
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0answers
271 views

HTTPS request works to Linux, not to Mac, sometimes

I have two sites, say mac.example.com and linux.example.com. I'm using the same wildcard SSL cert, obtained from RapidSSL. If hit up either of the sites in a browser, hosted either in Linux (on ...
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1answer
188 views

TLSv1 dosnt work witout enabling the sslv2

I'm using Apache 2.2.4 version. I already know this version only support SSLv2, SSLv3 and TLSv1.0, but something weird happens when I use it: When SSLv2 is disabled, the web browser (internet ...
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1answer
355 views

In OpenVPN, what's the risk of omitting the key-direction when using tls-auth?

In my TLS enabled OpenVPN configuration I would like to use the additional security offered by using tls-auth. The good news is, is that it works as expected. However, I have a question about the ...
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3answers
286 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): ...
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1answer
237 views

How to disable SSLv3 in Postfix 2.11?

I just noticed (by some online check tools) that my mailserver may allow SSLv3 and updated my configuration. My current config in Postfix 2.11.2: # inbound smtpd_tls_security_level = may ...
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0answers
182 views

Ubuntu OpenLDAP TLS negotiation failure

I've been following the Ubuntu Server Guide for OpenLDAP, and have run into an issue with what I suspect is replication. If I run the following command on the client with access to the server: ...
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1answer
261 views

Outlook 2010 suddenly starts autodiscover and event log shows schannel error 36887

we are running and rather small domain network using an SBS 2003 and Exchange 2003 on the server side and outlook 2010 on the clients. This setup has been working quite well for some years now and ...
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0answers
2k views

Enable TLS 1.2 in Windows Server 2012 running Exchange 2013 via IIS 8.0

I got some issues getting the TLS 1.2 protocol running on one of our Windows Server 2012 machines. I checked this using ssllabs.com by Qualys and also tested with a powershell script and the linux ...
0
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2answers
155 views

Strict-Transport-Security header set, but Firefox and Chrome still using HTTP

My website makes use of Universal SSL from CloudFlare and I would like to have the browser redirect to HTTPS automatically. However, as not all browsers support the type of SSL cloudflare uses, I ...
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3answers
267 views

Cannot disable RC4

I'm trying to disable RC4 ciphers by using this configuration on apache: SSLCipherSuite "EECDH+ECDSA+AESGCM EECDH+aRSA+AESGCM EECDH+ECDSA+SHA384 EECDH+ECDSA+SHA256 EECDH+aRSA+SHA384 EECDH+aRSA+SHA256 ...
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1answer
468 views

What ciphers do I need to disable in tomcat to match a specific apache conf?

I have instructions to disable weak ciphers in apache by adding SSLCipherSuite ALL:!MD5:!aNULL:!ADH:!eNULL:!LOW:!EXP:RC4+RSA:+HIGH:+MEDIUM to my httpd.conf. I am actually running tomcat, and in my ...
8
votes
4answers
9k views

Failed tls handshake. Does not contain any IP SANs

I'm trying to set up logstash forwarder, but I have issues with making a proper secure channel. Trying to configure this with two ubuntu (server 14.04) machines running in virtualbox. They are 100% ...
0
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1answer
52 views

refuse non ssl/tls connection?

i have a webserver and I have enabled the apache2 ssl/tls. so I can access my website with "https://IPADDR". but i can also access with just "http://IPADDR". is it possible to block non-ssl/tls ...
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1answer
171 views

Nginx doesn't send certificate chain

I've got the following certificate (first one is my own, the other two are from Comodo PositiveSSL): -----BEGIN CERTIFICATE----- MIIFWTCCBEGgAwIBAgIPPZlYpZLvxHV+Rsy+qSD/MA0GCSqGSIb3DQEBCwUAMIGQ ...
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 ...
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1answer
100 views

HTTPS on Amazon EC2 instance

I have a question which I hope somebody can answer for me. My situation: I have an Ubuntu Server running Apache2 on a EC2 Amazon instance, which is serving an OwnCloud instance. My goal: I want to ...
0
votes
0answers
64 views

Certificate stops working after computer reboot

Got a strange issue that I just can't find any clues. We have a program (Qlikview) which talks to a remote admin service via SSL (Qlikview Server) but it uses the certificate to validate the client. ...
0
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0answers
219 views

LDAP with TLS: connect error(-11)

I configured OpenLDAP and today I've configured the TLS for more security following these guide lines: Configure OpenLDAP with TLS=required Modifying the cn=config.ldif with config file: dn: ...
0
votes
3answers
600 views

Certificate on port 25 when trying to secure SMTP with POSTFIX

Background I think I am close to getting my POSTFIX setup to my liking. I've run some SMTP online checks and my SMTP passes all the basic security tests. I get a certificate warning in Thunderbird. ...
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0answers
27 views

Nss-pam-ldapd host based login with TLS

I have an openldap server configured and set up for linux client logins with host based authentications. All is fine except I wanted to have TLS and have found that it is not working de to a bug ...
0
votes
2answers
445 views

vsftpd does not give a valid certificate using CA cert.

When setting up vsftpd we have problems with it not providing a trusted connection us a basic pem certificate container using just our private key and certificate. We created our pem file with the ...
3
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3answers
8k views

How do I limit SSL/TLS connections to at least 128-bit encryption?

When I'm ordering an SSL cert for my public web server, how can I be sure that the web server (IIS 6 in my case) will only allow SSL/TLS client connections supporting our corporate standard of at ...
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1answer
1k views

Postfix TLS Error

I'm working with a Postfix/Dovecot/Roundcube setup, aiming for a virtual user mail system that can send mail through the internet, as documented here. Everything seems to work well; Dovecote shows no ...
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1answer
1k views

How to disable SSLv1/SSLv2/SSLv3 protocols to block Poodle to Apache 2.4.9 on Windows Server 2008 R2?

How can I disable SSLv1, SSLv2 and SSLv3 protocols on Apache 2.4.9 installed on a Windows Server 2008 R2 as a service? (I am not using IIS.) I still want to have TLSv1.2 protocol on my server. Here ...
2
votes
1answer
198 views

IIS SMTP TLS encryption issue

I enabled TLS in IIS SMTP Virtual Server with a self-signed server certificate. Made sure that the certificate has the FQDN of the server. Checked the TLS encryption checkbox in Virtual SMTP > ...
4
votes
1answer
4k views

How to switch between TLS 1.0 and SSL 3.0 at Java/JRE level?

I am using java 1.6. I have setup my tomcat as my ssl enabled server. And i have setup a ssl enabled client (java code). When i do a communication from my client to server. In java ssl dump in tomcat ...
4
votes
1answer
471 views

Postfix SMTP client not verifying against system-wide CA certs with tls_append_default_CA

On my internet-facing Postfix SMTP server running Debian Wheezy, I'd like to set up a secure connection with some known servers. Some are my own, running my own PKI/CA, some are public SMTP servers ...
3
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1answer
898 views

Postfix Recipient address rejected: Access denied Error

Trying to use zend mail smtp to send email from my php app login authenticated and give me this constant error I don't have to deal with I look into de 36 question here on serverfault.com changing ...