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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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
969 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
4k 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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2answers
671 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 ...
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2answers
298 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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0answers
47 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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0answers
109 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
81 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 ...
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1answer
736 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 ...
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0answers
65 views

Combining CA's into a single PEM

I have been wondering if it is possible to combine two CA certificates into a single .pem, then use that pem to allow clients with certs signed by either CA to create TLS connections with an LDAP ...
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1answer
192 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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1answer
224 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 = ...
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2answers
1k 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 ...
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2answers
197 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 ...
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2answers
426 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 ...
2
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1answer
186 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 ...
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1answer
206 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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1answer
825 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
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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3answers
5k 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 ...
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1answer
264 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 ...
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2answers
186 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 ...
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2answers
4k 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 ...
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2answers
1k 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 ...
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1answer
8k 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: ...
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2answers
1k 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 ...
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1answer
9k 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 ...
2
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1answer
332 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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1answer
542 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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0answers
180 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 ...
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1answer
9k 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 - ...
4
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1answer
735 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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3answers
7k views

CentOS openLDAP cert trust issues

# LDAPTLS_CACERTDIR=/etc/ssl/certs/ ldapwhoami -x -ZZ -H ldaps://ldap.domain.tld ldap_start_tls: Can't contact LDAP server (-1) additional info: TLS error -8172:Peer's certificate issuer has ...
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1answer
89 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 ...
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2answers
378 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 ...
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1answer
583 views

disable Postfix TLS support for specific destination server

I am trying to configure postfix to disable TLS for a specific remote smtp server that serves for multiple recipient domains. I have set up a policy map that already contains some entries for ...
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1answer
473 views

Plesk 10 Postfix with multiple IP adresses and SSL certificates

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 ...
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3answers
225 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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1answer
151 views

Can Subject Alternative Name accommodate multiple virtual mail domains?

I am currently running a postfix server with self signed certificates serving one mail domain, mycompany.com, the mail server is mail.mycompany.com and so is the CN of the certificate. Now, I need to ...
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2answers
679 views

Using nc.exe (NetCat) to send emails to secured SMTP server (TLS)

I used to send emails to unsecured SMTP servers using nc.exe utility (Windows port of NetCat) and now I need to send the same emails to a secured SMTP server (TLS). What additional parameters do I ...
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2answers
2k 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 ...
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1answer
1k views

postfix, TLS and rapidssl - “verify error:num=19:unable to get local issuer certificate”

I have a certificate from rapidssl. I run this command: openssl s_client -showcerts -connect smtp.server.com:465 I get this error: verify error:num=19:self signed certificate in certificate chain ...
2
votes
1answer
968 views

VSFTPD - FTP over TLS - Upload stops after exactly 82k?

I installed a VSFTP daemon on a CentOS server, using a RSA certificate for logging in using explicit TLS. Now, I cannot upload more than 82k. With files under that limit, there is no problem. The FTP ...
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2answers
907 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: ...
2
votes
2answers
287 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 ...
3
votes
1answer
132 views

Is there a low cost certificate authority that is generally accepted for TLS over SMTP? [closed]

I'm getting ready to enable TLS on my Postfix servers. I am doing this as a result of being told that there are some sending servers that refuse to send messages if TLS is not available. Since I ...
2
votes
2answers
168 views

SLAPD Fails to Open TLS Certificate

I am trying to configure TLS for SLAPD, but it keeps failing with the error "TLS init def ctx failed". I was able to trace the error to the system call where the daemon tries to open the CA ...
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votes
3answers
492 views

Does SSL encrypt the IP [closed]

I am building a personal server. I want to be able to access this server from anywhere, and I don't want this server to get blocked. It is my understanding that HTTPS encrypts my traffic, but I also ...
11
votes
3answers
7k 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 ...
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1answer
258 views

What's the difference between Postfix SMTP server and client in regards to TLS Support?

I need to implement TLS tunneling in my Postfix so that when needed it can use TLS certification (when trying to send mails to the domain xxxx.xx, their servers will ask mine to establish a TLS ...