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Find information on how to prevent computer worms and viruses and to improve your computer’s security. Follow some best practices to keep your system up-to-date by maintaining an up-to-date antivirus software subscription More: continued here
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To prevent access to a specific site that is not in the Websense Master Database, simply add the site to any category that is already blocked for the users you wish to block. An uncategorized URL that you add to a category is called a custom URL. (Similarly, a URL in the Websense Master Database that [...]
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Keywords offer protection against sites that have not explicitly been added to the Master Database or a custom URLs list. Keywords are associated with categories in the Master Database. When the Block Keyword setting is active for a category, Websense software blocks any site in that category whose URL contains an associated keyword. You must specify a [...]
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Opening up a whole interface to incoming packets may not be restrictive enough and you may want more control as to what to allow and what to reject. Lets suppose we have a small network of computers that use the 192.168.0.x private subnet. We can open up our firewall to incoming packets from a single [...]
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We will use an example based approach to examine the various iptables commands. In this first example, we will create a very simple set of rules to set up a Stateful Packet Inspection (SPI) firewall that will allow all outgoing connections but block all unwanted incoming connections:
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Data Execution Prevention (DEP) is a Windows Vista security feature that can help prevent damage to your computer from viruses and other security threats by monitoring your programs to make sure that they use system memory safely. If DEP notices a program on your computer using memory incorrectly, it closes the program and notifies you. [...]
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 As the number of slaves connecting to a master increases, the load, although minimal, also increases, as each slave uses up a client connection to the master. Also, as each slave must receive a full copy of the master binary log, the network load on the master may also increase and start to create [...]
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Deadlocking occurs when two user processes have locks on separate objects and each process is trying to acquire a lock on the object that the other process has. When this happens, SQL Server identifies the problem and ends the deadlock by automatically choosing one process and aborting the other process, allowing the other process to [...]
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Subversion depends on a number of third party tools and libraries.Some of them are only required to run a Subversion server; others are necessary just for a Subversion client. This section explains what other tools and libraries will be required so that Subversion can be built with the set of features you want
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1. MySQL Master-Master Replication Fails With ERROR 1200 (HY000) on Master 2. Password problem are solved by carefully checking your grant statements 3. When you have more than two master servers, you must use log-slave-updates option to ensure that changes are propagated in a chain. Beware of infinite looping of updates. Infinite loop is prevented [...]
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The xinetd daemon is a replacement for inetd, the internet services daemon. It monitors the ports for all network services configured in /etc/xinetd.d, and starts the services in response to incoming connections. To check if xinetd is enabled and running, execute: # chkconfig –list xinetd xinetd 0:off 1:off 2:off 3:on 4:on 5:on 6:off # /etc/init.d/xinetd [...]
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Before you learn how to configure your system, you should learn how to gather essential system information. For example, you should know how to find the amount of free memory, the amount of available hard drive space, how your hard drive is partitioned, and what processes are running. This chapter discusses how to retrieve this [...]
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The HTTP status code can provide some insight into the types of operations surfers are trying to attempt and may help to isolate problems with your pages, not the operation of the Apache. For example 404 errors are generated when someone tries to access a web page that doesn’t exist anymore. This could be caused by incorrect URL links in other pages on you site. Table 20-4 has some of the more common examples.
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By default, the configuration includes a policy that matches all default application inspection traffic and applies inspection to the traffic on all interfaces (a global policy). Default application inspection traffic includes traffic to the default ports for each protocol. You can only apply one global policy, so if you want to alter the global policy, for example, to apply inspection to non-standard ports, or to add inspections that are not enabled by default, you need to either edit the default policy or disable it and apply a new one. For a list of all default ports
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