Category Archives: Sysadmin

Cisco RVS4000: how to restrict access to forwarded ports

Imagine you have a firewall and want it to forward external traffic a specific internal port only if the source address matches some criteria. Easy? The requirements in question are as simple as can for a Cisco “business security gateway” – or better for absolutely any kind of “thing” claiming to function as a “firewall”. Well, Continue Reading →

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you have been hacked: zend_ion_index.php, wp_admin.php and inndex.php

From time to time, operating internet services can be quite demanding, especially when things don’t run the way they should. A perfect example for this is what happened yesterday. We were notified by an automated watchdog service that one of the systems we are operating on behalf of our customers had been compromized by some Continue Reading →

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Canon + Scanning: stoneage stupidity

After my good approx. 6 years old Samsung CLP-550 printer refused to cooperate with me (mechanical troubles), I decided that it was time to buy a new printer.Now that semi-professional multifunction printers become more and more affordable, I decided to go hunting for such a device and eventually got myself a Canon i-SENSYS MF8330cdn multi-function color Continue Reading →

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oracle: unexpire and unlock accounts

Some of our customers’ applications are built around Oracle, so we have to fight the beast from time to time. Unfortunately, some of the surprizes the beast has to offer are quite random and rare, and due to this we tend to simply forget how we fixed and/or circumvented the issues previously. As usual, google Continue Reading →

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rescanning the connected SATA/SCSI devices

Once in a while I stumble upon the problem where I have to attach a SATA or SCSI device to a running Linux box and for some reasons (ie. the device or the interface is not hot plugging capable) it doesn’t get recognoized by the system. Now the solution is very simple, just tell the Continue Reading →

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