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How to fix Dirty Cow vulnerability in CentOS, RedHat, Ubuntu, Debian, CloudLinux and OpenSuse Linux servers

by Reeshma Mathews | Oct 22, 2016 | Server Management

Dirty COW vulnerability was first discovered a decade ago and has been present in Linux kernel versions from 2.6.22, which was released in 2007. But the vulnerability gained attention only recently when hackers started exploiting it. This has led to the release of...

4 reasons for WordPress 403 error and how to fix them

by Reeshma Mathews | Oct 19, 2016 | Server Management, Technical Support, WordPress

WordPress 403 error is a very common error that is caused due to the webserver denying access to the WordPress page users are trying to access. The error messages that are commonly shown are – ‘403 Access Denied’, ‘403 Forbidden’, ‘You don’t...

How to reset administrator password of Coppermine photo gallery

by Reeshma Mathews | Oct 12, 2016 | Server Administration, Server Management, Technical Support

In Coppermine photo gallery, user passwords can be easily reset using ‘Forgot password’ link in the gallery login page. The new password generation link would be mailed to the email account corresponding to that user.   But in cases where the email...

How to fix ‘You are not authorized to view this page (403 error)’ in WordPress sites

by Reeshma Mathews | Oct 7, 2016 | Server Management, Technical Support, WordPress

A common error that happens when you try to login to the WordPress admin section is ‘You are not authorized to view this page (403 error)’. This 403 error gets displayed instead of the WordPress admin dashboard, after successful authentication using the...

How to fix ‘550 5.1.1 : Recipient address rejected’ error in Exchange and Postfix servers

by Reeshma Mathews | Sep 22, 2016 | Server Management

In our role as Website Support specialists for web hosting companies, we’ve seen internet users sending emails to certain recipients encountering the error: 550 5.1.1 <user@domain.com>: Recipient address rejected This error is associated with recipients...

How to fix email error ‘501 5.1.7 invalid address’ in Exchange servers

by Reeshma Mathews | Sep 20, 2016 | Server Management

A commonly noted error in Microsoft Exchange 2007 server is when the emails from certain 3rd party applications or scripts fail to deliver. The mails get rejected, giving this error message in the logs: SMTP MAIL command failed Error (501) 5.1.7 Invalid address Today,...

How to fix ‘571 Delivery not authorized message refused’ error in Exchange server

by Reeshma Mathews | Sep 17, 2016 | Server Management

At times, when you send mails to a certain recipient address, it may fail to deliver, giving the following error message: An error occurred while trying to deliver this message to the recipient’s e-mail address. Diagnostic information for administrators: Remote...

How to fix Joomla ‘SMTP connect() failed’ error while sending mails

by Reeshma Mathews | Sep 16, 2016 | Server Management, Technical Support

Joomla is a commonly used content-management software for websites. In Joomla, emails are used for various purposes such as contact form submissions or password resets. Joomla ‘SMTP connect() failed’ is a commonly encountered email error in Joomla, when...

How to fix  ‘553 sorry, unknown email address’ error in Outlook, Thunderbird and Outlook Express

by Reeshma Mathews | Sep 15, 2016 | cPanel, Plesk, Server Management, Technical Support

‘553 sorry, unknown email address’ is a common email error that happens because the recipient address is invalid. The senders would see this error in the bounce message they receive. Error 553 is also called SMTP Error 5.5.3 and can happen irrespective of...

How to fix ‘MySQL Remote Root Code Execution’ / ‘Privilege Escalation’ (zero day ) vulnerability – CVE-2016-6662

by Reeshma Mathews | Sep 13, 2016 | MySQL, Server Management

On Sep 12th, Dawid Golunski announced CVE-2016-6662 aka MySQL Remote Root Code Execution / Privilege Escalation (0 day) vulnerability. CVE-2016-6662 is reported as a critical exploit which can allow local and remote attackers to execute arbitrary code with root...
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