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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for July 23rd, 2018

Use TLS 1.2 or higher, as TLS 1.1 is phased out on many sites, after TLS 1.0/SLL has been disabled by most for a while now

Posted by jpluimers on 2018/07/23

If you get an error like this in one of your tools

OpenSSL: error:1407742E:SSL routines:SSL23_GET_SERVER_HELLO:tlsv1 alert protocol version

it means you are using a tool not yet properly supporting TLS 1.2 or higher.

Or in other words: update your tool set.

The reason is that – after turning off TLS 1.0 a while ago – more and more sites do the same for TLS 1.1.

A prime example of a site that warned on this in a clear way very early on is github:

Others have done this too, for instance:

TLS 1.0 is vulnerable to many attacks, and certain configurations of TLS 1.1 as well (see for instance [WayBack] What are the main vulnerabilities of TLS v1.1? – Information Security Stack Exchange), which means that properly configuring the non-vulnerable TLS 1.1 over times gets more and more complex. An important reason to say goodbye to that as well, as TLS 1.2 (from 2008) is readily available for a long time. The much more recent TLS 1.3 (from 2018) will take a while to proliferate.

I ran in the above error because on one of my systems, an old version of wget was luring around, so I dug up the easiest place to download recent Windows binaries for both win32 (x86) and win64 (x86_64):

[WayBack] GNU Wget for Windows having a table indicating the OpenSSL version for each wget build.


Reference: Transport Layer Security – Wikipedia: History and development

Posted in *nix, https, HTTPS/TLS security, OpenSSL, Power User, Security, wget | Leave a Comment »

In case I ever need to record calls on my Fritz!Box devices

Posted by jpluimers on 2018/07/23

I need to dig a bit deeper into these links to see how easy it is to record calls made on a Fritz!Box then playing back the captured calls.

Note that in various countries you have to indicate to the calling parties that their calls can be recorded.

Read the rest of this entry »

Posted in Fritz!, Fritz!Box, fritzcap, Internet, Power User | Leave a Comment »

The Illustrated Guide to Kubernetes – The Isoblog.

Posted by jpluimers on 2018/07/23

One day you will do containers.

If you want to know how k8n (Kubernetes) can help you with Docker containers, then read [WayBackThe Illustrated Guide to Kubernetes – The Isoblog. and watch the video below.

Very well explained!

Via: [WayBack] The Illustrated Children’s Guide to Kubernetes You can now stop recommending it to me. – Kristian Köhntopp – Google+



Read the rest of this entry »

Posted in Cloud, Containers, Docker, Infrastructure, Kubernetes (k8n), Power User | Leave a Comment »

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