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2 non-obvious reasons for “550-Please turn on SMTP Authentication” error in cPanel & Exchange servers, and what to do about them

by Visakh S | Aug 20, 2016 | cPanel, Plesk

SMTP error from remote mail server after RCPT TO:<user@domain.com>: host domain.com [xx.xx.xx.xx]: 550-Please turn on SMTP Authentication in your mail client. 550-(mail.server.net) [xxx.xxx.xxx.xxx]:36825 is not permitted to relay through 550 this server without...

What causes SpamAssassin error “Use of uninitialized value in concatenation (.) or string” in cPanel/WHM servers

by Visakh S | Aug 17, 2016 | cPanel, Server Administration, Technical Support

As an outsourced technical support provider for Shared Web Hosting Companies, we often encounter application errors and system faults. In the past couple of months, an error that’s often reported by cPanel/WHM users is: Aug 17 00:25:24.450 [382682] warn: Use of...

How to fix “HTTP/1.1 New Session Failed” error in Odin Plesk Windows Virtuozzo VPS servers

by Visakh S | Aug 13, 2016 | Plesk, Server Administration, Technical Support

In our role as Outsourced Tech Support for web hosts, we manage both Windows and Linux servers of our customers. In Windows Virtuozzo servers, one of the common errors reported by Odin Plesk web owners is “HTTP/1.1 New Session Failed”. All sites in the...

How to mitigate Linux “Off-path” TCP exploits (CVE-2016-5696) in CentOS, RedHat, Ubuntu and Debian

by Visakh S | Aug 12, 2016 | Server Administration, Server Management

If you have a website, chances are that it’s running on a Linux server. And the latest news is that, Linux servers with kernel versions 3.6 to 4.6 are vulnerable to malware injection attacks. This was demonstrated on Aug 10th, when security researchers injected...

How to fix Fatal error: Class ‘PDO’ not found in PHP apps like Drupal, Prestashop, Joomla, etc

by Visakh S | Aug 8, 2016 | Drupal, MySQL, Server Management

Fatal error: Class ‘PDO’ not found is an error seen in websites running PHP applications such as Drupal, Prestashop, WordPress, etc. It’ll look something like this: Fatal error: Class ‘PDO’ not found in...
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