Attaching your server to a network increases the risk of security problems, and security problems are the greatest risk to the stability and reliability of your system. The most difficult task of running a network service is keeping the system up and running 24 hours a day, seven days a week. Linux makes that possible because it is rock solid. So solid, in fact, that whenever a Linux system crashes, I suspect an outside force, such as a security intruder.
However, security breaches are not the only threats to the reliability and stability of your Linux server. The next chapter describes the other kinds of network problems that can appear, and tells you what to do to troubleshoot those problems.
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