Mail: Connect TLS encrypted to a smtp server by telnet

Hi,

the SMTP protocol is ASCII based. In the past, the SMTP protocol goes unencrypted over the wire means you can simply send email by connecting to the SMTP port 25 and enter some SMTP commands via telnet:

michael@debdev ~ # telnet smtp.yourdomain.org 25
EHLO test.example.com
MAIL FROM:info@yourdomain.org
RCPT TO:receiver@receiversdomain.org
DATA
Subject: Testmessage
<ENTER>
<ENTER>
This is a test message. End with <ENTER><ENTER> and point

.
QUIT

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OpenSSL: Check if a certificate belongs to a private key

Hi,

if you want to check if a certificate has it s origin in a specific private key respectively the signing request use the following openssl commands:
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Apache: Protect a folder by a password, but one file is for public access

Hi,

let us assume you want to protect a whole directory by password and but one file must be readable for public access. This can easily be done by a .htaccess file.

For example: Who want to trotect the folder /var/www/html and only the file public.html should be readable without a password.
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Java: Error AccessControlException => java.net.SocketPermission” “192.168.100.10:8888” “connect,resolve

Hi,

you want to launch a Java Applet and you get an error like this AccessControlException => java.net.SocketPermission” “192.168.100.10:8888” “connect,resolve.

This error typically occurs when you start an applet and this applet want to open a socket connection to an different IP Address or TCP Port as the applet came from. Since Java 8 such action would blocked.

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Windows 10: Powershell Script to protect your privacy

Hi,

this Powershell script is a try to protect your privacy in Windows 10.
Update 17.08.2016: Lot of adjustment to Windows 10 1607. Added more documentation
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