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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...

How to fix PHP FFmpeg error “Unable to load dynamic library ‘/usr/local/lib/php/extensions/no-debug-non-zts-20090626/ffmpeg.so'”

by Reeshma Mathews | Aug 19, 2016 | Server Management, Technical Support

Server wide errors are always a panic situation for server owners. A single server wide error can affect multiple websites in a split-second. To maintain business credibility, its therefore crucial to fix server wide errors promptly. At Bobcares, we do this for...

How to fix ‘Disk usage warning’ alerts in cPanel/WHM servers

by Reeshma Mathews | Aug 18, 2016 | cPanel, Technical Support

At Bobcares, we provide outsourced technical support services for shared hosting companies. During this service span, we’ve resolved a multitude of server issues and errors. One among the very common issues faced by cPanel/WHM server owners is getting this disk...

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...

Easy guide to setup Amazon EC2 multiple IPs

by Reeshma Mathews | Aug 12, 2016 | Server Management

By default, an EC2 instance comes with just a single public IP. However, there are many scenarios where you need multiple public IPs for your web services to work. For instance, multi-site WordPress hosting, multiple websites with SSL, high availability fail-over...

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 Amazon EC2 IP blacklisting in Spamhaus PBL and other email RBLs

by Reeshma Mathews | Aug 9, 2016 | Server Administration

Amazon claims to have a system to white-list all their IP addresses at Spamhaus regularly. But we still see Amazon EC2 users reporting mail issues due to IP blacklists by Spamhaus. IP blacklisting occur when your mail server gets compromised due to any malware or open...

AWS Port 25 block – Why does it happen and how to fix it?

by Reeshma Mathews | Aug 8, 2016 | Amazon Web Services (AWS)

From payment confirmation to support queries, emails play a vital role in online business communication. Delayed alerts or lost orders end up adversely affecting the business. In AWS EC2 instances, mail delivery problems can happen due to many reasons, mainly port 25...

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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