If you want to have the latest version of NGINX installed on your server with Directadmin here is what you can do about it.
CloudFlare reported in their blog-post about a big increase in an obscure amplification attack vector - using the memcached protocol, coming from UDP port 11211. Here we will provide details on how to protect your server with Directadmin.
Should you get an error in Roundcube "SMTP Error (-1): Connection to server failed" when trying to send emails check our case as yours might be the same. Here we will suggest a solution which worked for us.
If Directadmin fails to create users on a remote or locally installed MySQL 5.7+ with an error "Unable to add access host:
Error executing query: Unknown column 'password' in 'field list'" here is a solution for the case.
If you receive this alert: "ALERT: exim paniclog /var/log/exim/paniclog has non-zero size, mail system possibly broken" after you upgraded Directadmin version, here we will let you know why it happens.
If directadmin with custombuild fail to build or update a service and the error "cannot run C compiled programs" is dropped, here we suggest one of the possible solutions.
When trying to install a PECL extension for PHP with name memcached a configure process ends with an error "no, libmemcached sasl support is not enabled. Run configure with --disable-memcached-sasl to disable this check", here you will know why it happens and how to deal with it.
While installing new sudo instructions we faced an error: "sudo: no valid sudoers sources found, quitting". Here is a fix which worked in our case.
If you want to use Gmail/HotMail/OutLook/other external mail service for your domain which is hosted on a Directadmin server you should disable "Local Mail Server" option for it.
Google's reCaptcha installed as a plugin for Roundcube is a good way to protect your server against brute-force attacks on a webmail. Here you can find a guide on how to enable it on Directadmin server.