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emergency administration


MySQL “stop: Unknown instance:” error – Why it happens and how to fix

Server errors are no fun.

And it is especially frustrating when the error is cryptic, like “Unknown instance“.

What does it mean, really?

A common error people face in VPS, Cloud and Dedicated servers is MySQL failing with “stop: Unknown instance:(more…)

How to fix “554 Too many recipients” email error

Here at Bobcares.com, we provide Outsourced Tech Support to web hosting providers. As part of our service, we resolve email errors posted by hosting users.

A common email bounce error we see in VPS and Shared servers is:

The rejected e-mail address was 'user@domain.com'. Subject 'My mail subject', Server Error: 554, Server Response: 554 Too many recipients, Server: 'mx.sender.com', Windows Live Mail Error ID: 0x800CCC79, Protocol: SMTP, Port: 587, Secure(SSL): No

This error is seen when people attempt to send group mails with a large CC or BCC list. (more…)

How to fix Mutagen Astronomy vulnerability (CVE-2018-14634 bug) in RedHat, CentOS, Debian & Ubuntu servers

On Sep 25th, security researcher Qualys disclosed a new Linux Kernel vulnerability dubbed Mutagen Astronomy (CVE-2018-14634) that allows attackers to gain administrator (root) privileges in unpatched Linux servers.

Here at Bobcares.com, we maintain servers of web hosts and other online businesses as part of our Server Management Services. In this service we detect emerging threats and proactively patch the servers to prevent security exploits. (more…)