Networking

Firewall Session Problems

I ended up spending a great deal of time longer than anticipated troubleshooting an application problem because the cause of the problem wasn't application based - it was network based.

I'm posting this as a reminder to others out there that when networking is a piece of the application level puzzle, don't ignore network resources when troubleshooting your problems.

Network Monitoring with Nagios

Nagios is an open source tool that allows you to monitor network resources for uptime and more complex health checks. You can use the tool to make sure your websites are up and running, or do more complex activities like ensuring that your server's hard disks are reliable. Actually, the number of things that you can monitor with Nagios is a little bit intimidating.