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This series was created because we had a problem with a hacker that infiltrated our system and sent out emails in early 2015. After discussing the information with a couple colleagues and their experiences dealing with similar issues I was encouraged to share what I had created and why.

In this episode I’ll describe some of the details of the OS X Firewall and what was ...

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As we saw on our previous entry of this series , we had a problem with a hacker that infiltrated our system and sent out emails.

There are three log files that are scanned for attacks, the system log, the mail log and the amavis log. They all have different formats, but they all contain the IP address of the machine contacting our server in the log line of the failed access attempt. The program ...

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Early in 2015 one of the accounts on our server got hacked and was used to send out truckloads of spam emails. It took several hours for me to become aware of the issue, unfortunately. I only realized it once the number of bounces escalated to the point that our server was being blocked by other servers.

The account password was changed and some discussions were held with the user to see ...

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Hi all -

I gave a presentation at the Chicago Perl Mongers group on 06/25/2015 on using Perl to read and write Excel files. There is a brief discussion on the different modules for handling the 2003 and earlier .xls files, as well as the 2007 and later .xlsx files.

Writing data with different formats for headers and data, ...

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As the coding geek behind Custom Visuals, I’m responsible for the application development that takes place under this roof. About half of my livelihood since 1984 has been as a small business application developer and the other half as a software engineer in larger corporations. They both have advantages ...

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