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How To Determine CentOS or Red Hat Version
Posted by Jeff H. on March 10, 2009
Versions. Versions. Versions. Understanding versioning for Linux systems is not as easy as one may expect. The numerous Linux distributions combined with differing practices by control panel vendors produces dizzying array of versions, releases, hot fixes, errata, bug fixes, patches, updates, and workarounds. Learn how to find the version on your system.
How To Remove Your Email Server from Yahoo’s Blacklist
Posted by Jeff H. on March 09, 2009
So you fire up your favorite mail client (mine's Thunderbird) only to find upset customers and bounced emails. Appears, Yahoo! has blacklisted you. Learn how to get out of their blacklist.
Why Not Customize Red Hat? Security and Stability
Posted by Jeff H. on January 22, 2009
This week, Red Hat has rolled out RHEL 5.3,. We've been busy pushing it out to our servers as we like to keep them updated. Along with the 5.3 release, Mark Cox posted an interesting article on the risk profile of 5.2. He's examined the number of patches that have been submitted since the 5.2 release in May of 2008. For a default install, which many of our clients use, there were 45 advisories to address 127 vulnerabilities
How to Securely Managed Files with Secure FTP SCP WinSCP
Posted by Jeff H. on January 19, 2009
Still using FTP? If so, you may want to consider this: Every time your FTP client logs into your server, you are sending your user name and password over the internet unencrypted.
Ending Clear Text Protocols
Posted by Jeff H. on December 09, 2008
We spend a lot of time and money trying to keep our systems secure. From security patches to intrusion prevention systems, we attempt to fortify our systems from the hackers while not frustrating our end users. We remind users to choose good passwords and keep their systems free from viruses. If we are diligent, we check for new security patches frequently and carefully monitor our systems for signs of mischief. Despite these efforts, we often let clear text protocols slip into the mix of our internet operations and possibly compromise all of our efforts.
POP Before SMTP and IP Forwarding
Posted by Jeff H. on November 13, 2008
Recently we migrated some servers to a new IP address. About a day after the migration, a client complained that their email was delayed. When we investigated, we found 10,000's of emails jamming up the queue.
