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Choose appropriate remote e-mail access for your site, taking into consideration the purposes, benefits, and disadvantages of the available protocols. I recommend for security, stability and available access controls that you use a server based on IMAP . Choose a stable and secure server as your platform for remote e-mail access and ensure you periodically update it and apply any relevant security patches. If you are using a product such as UW-IMAP or Qpopper, which have proven to have a number of security flaws, consider using another application such as Cyrus IMAP . Consider chrooting your remote e-mail installation to further secure your installations from penetration. I show you how to do this using Cyrus IMAP . Always ensure you use SSL/TSL-enabled remote access via IMAP or POP and ensure your , clients use SSL/TLS to encrypt any connections. This will protect your e-mail traffic from eavesdropping during its transmission. Always use a secure authentication method such as those available through Cyrus SASL to authenticate your users against the remote e-mail access server. Also consider using a sealed system where the only local shell logins are for system administration use only, and all other users have access to their e-mail stores only. If you are going to use Fetchmail, then ensure you use TLS to ensure all connections are encrypted. If you cannot use TLS, try to tunnel your connections through OpenSSH. This will help prevent attackers from eavesdropping on your Fetchmail sessions.

10

If you intentionally repeat words, such as boo boo, you can disable the option so that the repeated words will not be flagged To change the default spelling and grammar settings: 1 Click the Microsoft Office button 2 Choose Word Options 3 Select Proofing 4 Turn on/off the options under When correcting spelling and grammar in Word 5 Click OK..

task2.Start(); task1.Wait(); Task.WaitAll(task2, task3, task4); Figure 5-4 illustrates the waiting process.

Unless you have a real need to run an FTP server, then I recommend you do not run one The inherent insecurities in FTP server daemons and the difficulty in securing FTP traffic make FTP an extremely risky proposition as a production service If you do choose to run an FTP server, then I recommend the vsftpd FTP server available from http://vsftpdbeastsorg/ It is secure, has good performance, and contains a number of security features including support for SSL/TLS FTP transfers Ensure you adequately firewall your FTP server You should utilize the ip_conntrack_ftp module provided with iptables to enable FTP connection state tracking This provides you with the ability to limit the types of connections made to your host Additionally, you should look at limiting the range of ephemeral ports used by your FTP server for its data connections.

If you going to allow local user access to your FTP server, consider limiting the networks able to log into that server I recommend you allow access only from trusted networks I recommend placing your local users in chroot jails The vsftpd server allows you to chroot your local users into their home directories If you are going to allow the uploading of files to your FTP server, ensure you set your umask and default upload permissions carefully to prevent the uploading of files that could be used to compromise your host For example, restrict the uploading of executable files Ensure you set up resource controls on your FTP server to limit the number of incoming connections and the number of connections from an individual IP address This limits the risk that your FTP server could be subject to a DoS attack.

You could also limit the data transfer volumes on your FTP server Examine the feasibility of using SSL/TLS for your FTP control and data connections You will need to utilize FTP clients that support SSL/TLS0.

Task.WaitAny()

11

One of the key reasons so many BIND servers are the targets of attacks is that a large number of vulnerabilities have been discovered in older versions of BIND. If you are running an older version of BIND, especially a version prior to BIND 8, you should upgrade immediately. You should keep your BIND version up-to-date and regularly monitor the CERT and BIND mailing lists and the ISC Web site for notifications of any vulnerabilities or issues. When designing your DNS infrastructure, you should provide separate servers for your server and caching functions. This reduces the risk that an attack on one function will affect the other function. The same principle applies to your internal- and external-facing BIND servers. You should place your external BIND servers in a DMZ, protected by a firewall, or a similar network design. These servers should not also provide server or caching functions for your internal network. You should provide other servers, located on your internal network, for the provision of server and caching functions for your internal clients.