Posted on in System Administration
One of the suggestions for improving the performance of your website is to properly set the Expire and Cache-Control headers of the HTTP response for images. Since images rarely change, the Expire time should be set far in the future. This ensures that web browsers will attempt to retrieve the …
Posted on in System Administration
The default username and password for all versions of Cisco Access Registrar (as of version 5.0):
Username: admin
Password: aicuser
Perhaps this will save you a little time someday.
Posted on in System Administration
Note: This post is a natural continuation of my post Command Logging is Vital to System Administration.
The primary purpose of sudo is to allow system administrators to execute
commands as the superuser (AKA root). It allows a group of people to manage a
system without the hassle of keeping …
Posted on in System Administration
If you're using Red Hat Enterprise Linux (RHEL) or one of it's variants (CentOS,
etc.), you may have noticed that using a non-standard document root for your
Apache-based web site results in a DocumentRoot does not exist warning if
the directory exists. The most likely cause of this problem is …
Posted on in System Administration
If you have an interest in information security from a technical or managerial point of view, check out Principles of Information Security. It does an excellent job of presenting material for both audiences.
If you have other vendors you would like to see on this list, send me a message …
Posted on in System Administration
Previously, I mentioned that I was unable to remove the FAX= portion of the string produced by Cisco's $s$ (or $d$) macro in a T.37 store and forward fax configuration. That's still the case. I have found no way of doing this inside IOS. If it's possible, I've …
Posted on in System Administration
I use screen for various purposes. It's nice to be able to sit down at a different terminal and attach to my same session, for example. I also occasionally run some long-term commands that will blow up if my session is disconnected. The one thing I need to do with …
Posted on in System Administration
You stopped Agent Manager on your Lotus Domino 6.5 server when you meant to tell
it to restart? I've done that. If you don't know how to start it up again, finding
that information can be pretty frustrating. Not to mention potentially embarrassing.
To get the Agent Manager running …
Posted on in System Administration
Thanks to a hard drive failure, I recently installed a fresh copy of Mac OS X 10.5
(Leopard) on my MacBook. I do a lot of work on remote systems and SSH is my bread
and butter. Whenever I tried to SSH into other Macs on my local network …
Posted on in System Administration
One of the more underrated tools included with Microsoft Windows Server is Network Monitor. Network Monitor is a packet capture tool that allows network administrators to gain insight into what network traffic is being sent and received by the server. This data can be useful in diagnosing various network problems …
Posted on in System Administration
I was involved in a project to apply a maintenance release to an existing Lotus
Domino installation running on Windows Server 2003. The goal was to upgrade the
server from version 6.5.5 to 6.5.6. During the upgrade process, the installer
checks the version of Domino that …
Posted on in System Administration
The beginning of truly inexpensive data storage began with the introduction of magnetic tape. Unlike previous data storage technologies such as punch cards, magnetic tape has the ability to hold large quantities of data. Additionally, the ability to store data on magnetic data did not inhibit the format of the …
Posted on in System Administration
Most of OS X Caching Only Name Server series was written in the pre-Leopard days. The final step in that process was to make the new server the preferred DNS server. Unfortunately, a change was introduced in Leopard that only allows you to add the local server to the list …
Posted on in System Administration
I manage servers and network devices that, for a variety of reasons, allow users to connect via SSH from anywhere in the world. Although the traffic generated by these connections is encrypted, leaving this open to the world does present a bit of a security risk. Would-be crackers use compromised …
Posted on in System Administration
Those that know me may have heard me rant about my "Reverting Mac Dock Icon Problem." The problem is this: I have put a folder on my Dock and every time I log out or reboot, the icon reverts from my custom icon to the default folder icon. To fix …
