The s_client command from OpenSSL is a helpful test client for troubleshooting remote SSL or TLS connections. The post strives to walk you through various examples of testing SSL connections with different ciphers, TLS versions, and SSL server certificate analysis. Testing SSL configuration on … [Read more...] about openssl s_client commands and examples
OpenSSH SFTP Server
This article will demonstrate how to install and manage an OpenSSH SFTP Server on Linux. This in effect is a Linux SFTP server using OpenSSH instead of the more common vsftpd package. The question of which of the two options is the best sftp server for linux will not be answered in this article. … [Read more...] about OpenSSH SFTP Server
AWS CLI Route 53 Change
This article will demonstrate how to create, delete, or change a DNS record in AWS Route 53 with the AWS CLI. In addition, this article will demonstrate how to write a bash wrapper function to wrap the cli commands to help with memorization. If you are anything like me, I would much prefer a … [Read more...] about AWS CLI Route 53 Change
No matching host key type found – SSH and SFTP
The purpose of this article is to demonstrate how to use ssh to remotely connect to an older linux host from a newer version of openssh when receiving the no matching host key type found error. The example in this article was used against an older RHEL 6.5 server. Additionally, the article will … [Read more...] about No matching host key type found – SSH and SFTP
Sendmail vs Postfix – Mail Transfer Agent Comparison
Sendmail vs Postfix - both are Mail Transfer Agents (MTA) used for sending mail from a Linux host. The primary concerns when deciding which MTA to use come down to performance, ease of use, and security. Postfix is the most commonly used MTA, for good reason. It is a security oriented mail server … [Read more...] about Sendmail vs Postfix – Mail Transfer Agent Comparison
Redhat Disable IPv6
This article will demonstrate how to in Redhat disable the IPv6 protocol. This is especially useful and common in private networks that have no need to support IPv6. Private networks usually have more than enough IPv4 addresses, and enabling IPv6 can introduce a number of unexpected networking … [Read more...] about Redhat Disable IPv6
AWS CLI Route53 Query
The purpose of this article is to demonstrate how to use the AWS CLI Route53 Query functionality to search your DNS managed in Route53. This article will demonstrate two specific types of searches based on a single query parameter. One example for an IP based search and one example for a DNS name … [Read more...] about AWS CLI Route53 Query
java keystore pkcs12 legacy
This article will detail how to troubleshoot and correct the java keystore pkcs12 legacy issues with keystores generated with newer cryptographic algorithms and older versions of Java. If you have encountered these issues with OpenSSL instead of the Java keytool, read our article specifically for … [Read more...] about java keystore pkcs12 legacy