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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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 ...
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2answers
29 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 ...
4
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2answers
39 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
18 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 ...
0
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1answer
22 views

SMTP doesn't work on distinct machine [on hold]

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 ...
-1
votes
2answers
21 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] ...
8
votes
0answers
149 views

Why is Internet Explorer 11 unable to connect to HTTPS sites when TLS 1.2 is enabled?

Normally I don't use Internet Explorer at all. I use it only in design time for interface tests (development machine and with unencrypted http). Every week I run the SSL Labs server test which says ...
0
votes
1answer
18 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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votes
1answer
26 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
53 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 ...
-1
votes
0answers
45 views

TLS v.1.2 in CentOS 5.1

Is it possible to enable TLS v.1.2 in CentOS 5.1 ? I've upgraded the openssl library to 0.9.8e-fips-rhel5 01 Jul 2008. Read about a repository from www.axivo.com but it doesn't apply to CentOS. ...
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0answers
23 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 ...
6
votes
1answer
42 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 ...
-1
votes
1answer
20 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 ...
3
votes
3answers
49 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, ...
1
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0answers
37 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 ...
1
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1answer
59 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
20 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 ...
1
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1answer
73 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 ...
1
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1answer
106 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 ...
0
votes
3answers
65 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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0answers
36 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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0answers
104 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 ...
1
vote
1answer
69 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 ...
0
votes
1answer
121 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
118 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
votes
2answers
73 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 ...
2
votes
1answer
127 views

reason: 403 4.7.0 TLS handshake failed

Sending email to one particular domain, I get the following error: ----- The following addresses had permanent fatal errors ----- <> (reason: 403 4.7.0 TLS handshake failed.) ----- ...
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vote
3answers
72 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 ...
0
votes
1answer
29 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 ...
0
votes
1answer
48 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 ...
0
votes
1answer
45 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 ...
2
votes
1answer
50 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
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0answers
31 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
votes
1answer
69 views

Problems using HSTS header at top level domain with includeSubdomains

Let's say I run a company "Example Inc" and have a website at: https://www.example.com Now because I'm security conscience I'm using https and would like to set the HSTS header to force its use. I'd ...
0
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0answers
41 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: ...
1
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0answers
17 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
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2answers
93 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 ...
0
votes
3answers
183 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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votes
1answer
389 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 ...
3
votes
1answer
650 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 ...
3
votes
1answer
144 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 ...
1
vote
1answer
311 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 ...
2
votes
1answer
69 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 > ...
0
votes
0answers
60 views

In nginx logs: SSL3_GET_CLIENT_HELLO:required cipher missing

We disabled SSLv3 several months ago, and on Sunday I noticed this filling our nginx logs. It's been continuing ever since and users are emailing us saying they cannot connect to our site. 2015/01/13 ...
3
votes
1answer
166 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 ...
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0answers
45 views

Remmina TLS, NLA works, but high encryption fails

Remmina works fine with TLS and NLA. But if encryption is set to high instead of client compatible, then it stops working. Questions: 1. Why setting high encryption prevents connectivity? 2. What's ...
1
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2answers
881 views

Server sent passive reply with unroutable address when connecting to FTP site with FileZilla

I get the error "Server sent passive reply with unroutable address. Using server address instead." when connecting to a FTP site (not SFTP). I have connected to this site many times, however ...
0
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0answers
150 views

How to update libssl for TLS_FALLBACK_SCSV vulnerability on nginx configuration?

I can't get the TLS_FALLBACK_SCSV to work when testing on SSLabs, keeping me from an A+ rating. Seems it an issue of libssl, not nginx configuration. I have updated to OpenSSL 1.0.1k 8 Jan 2015, but ...
2
votes
0answers
73 views

OpenLDAP TLS - test results in Bad file descriptor

I have set up an openldap server including tls on ubuntu 14.04 following this guide. While testing the connection, I get results that I can not find an explanation for. ldapsearch -xLLL -Z -W -D ...