How To Check Exchange Autodiscover SRV Record Using Nslookup enerally the Exchange external Autodiscover DNS entity is configured as a regular A record.  Sometimes a service record (SRV) is used instead.  Since I have the habit of forgetting the syntax of quickly querying for the SRV record, this is one of those shared bookmark posts! Nslookup is the tool of choice here!  Its […]

Providing Email Outlook client autoconfiguration information If you’ve ever configured a gmail or hotmail account in a mail client such as Thunderbird, Outlook or Apple Mail you will have noticed that all it asks of you is your username and password and automatically sets up the mail server hostnames, port numbers and connection settings. However, if you set […]

Saving copies of all email using Exim I’ve often seen questions on lists by people who want to save all incoming and outgoing mail on a specific server in an archive, this is usually due to some auditor requesting it or corporate legal types requesting it. The Exim documentation says it can be done but does not give examples neither does […]

5 Common Server Setups For Your Web Application Introduction When deciding which server architecture to use for your environment, there are many factors to consider, such as performance, scalability, availability, reliability, cost, and ease of management. Here is a list of commonly used server setups, with a short description of each, including pros and cons. Keep in mind that all of the […]

How to use KVM from the command line on Debian or Ubuntu There are different ways to manage virtual machines (VMs) running on KVM hypervisor. For example, virt-manager is a popular GUI-based front-end for VM management. However, if you would like to use KVM on a headless server, GUI-based solutions will not be ideal. In fact, you can create and manage KVM VMs purely from the […]

Fix Self-sign CA – VestaCP password driver

I have to updated the selfsigned SSL cert as following: echo -n | openssl s_client -connect | sed -ne ‘/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p’| tee ‘/usr/local/share/ca-certificates/’ && update-ca-certificates and update the password/ to $rcmail_config[‘password_vesta_host’] = ‘’;