What is Wi-Fi and how secure is it?
1. Overview Wi-Fi, (or Wireless Fidelity) is a wireless LAN technology which allows Wi-Fi equipped computers to connect to the Internet from anywhere within the range of a base station. Wi-Fi...
View ArticleExchange Server and firewall
An Exchange Mail user who has a problem establishing a connection to the server may have one or more TCP ports blocked. The blockage may be from computer or router firewall, or your Internet provider...
View ArticleSetting mail header for a foreign language
Depending on the client's regional settings and an ability to read foreign language on the client's computer, emails sent using traditional text/plain mail header may not be readable by foreign...
View ArticleEnable Out-Of-Office replies to the Internet
By default, Microsoft Exchange Server 2003 Out-of-Office replies to the Internet is disabled. This is done to disallow Out-of-Office auto-replies to be sent outside of the organization to prevent...
View ArticleInstall spamassassin with sendmail
Documentation http://spamassassin.apache.org/1. Install spamassassin on the server # yum install spamassassin 2. Install required perl CPAN modules # perl -MCPAN -e shell cpan> install Digest::SHA1...
View ArticleHow do I extract information from an SSL key and certificate?
An SSL certificate contains the information about issuer, valid dates, subject and other cryptic information. The openssl x509 subcommand may be used to retrieve those information from a SSL...
View ArticleTCP Sweep - What is causing it?
Running a company as a reseller web host, you'll often receive an email from your upstream provider reporting security violations. If you do not correct the problem in a timely manner, your upstream...
View ArticleMy serial printer doesn't work. What shall I do?
Serial printers generally do not require a device driver to work in a desired software application. If POS software cannot print directly to the serial printer, it is preferable to make sure we can...
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How to share a folder between the VMware host and guest?
If you need to share a holder between your Windows host and Linux guest, you may use native VMware folder sharing available on VMware Workstation or VMware Player. To allow folder sharing, you must...
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