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Figure 232 Identity of the default IMAP4 virtual server
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The IP address is currently displayed as All Unassigned This setting means that the virtual server will respond on all IP addresses that are currently unassigned to other IMAP4 virtual servers For example, if we had five different IP addresses bound to the network adapter on the machine and a custom IMAP4 virtual server assigned one of these IP addresses, the default IMAP virtual server would respond to client requests for any of the four other addresses Box14 is currently multihomed and has two IP addresses assigned to its adapter, namely 172161114 and 172161124 (if your server only has one address, then add another using Local Area Connection in Network and Dialup Connections in Control Panel) Let s assign this IP address the identity of the default IMAP4 virtual server Click the dropdown arrow at the right of the IP Address listbox shown in Figure 232 and select 172161114 as the IP address for the virtual server By default, the TCP port for all IMAP4 virtual servers is set to the well-known port 143 (or 993 if SSL is enabled) To view this, click the Advanced button on the General tab to display the dialog box (Figure 233) By clicking Edit, you can change the TCP port or SSL port for the virtual server or select another IP address
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Figure 233 Advanced identity settings for default IMAP4 virtual server
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Common to the administration of SMTP, POP3, and IMAP4 virtual servers is the ability to control incoming connections to those virtual servers Let s look at the four methods with which this can be done by examining the default IMAP4 virtual server further The first three methods are configured by using the buttons on the Access tab of the Properties Sheet for these virtual servers (Figure 234), and the fourth uses the settings on the General tab (Figure 232)
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Figure 234 Access tab on the Properties Sheet for the default IMAP4 virtual server
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Access control This method allows you to control access to the virtual server by requiring that incoming connections be properly authenticated You configure this setting using the Access Control button on the Access tab of the Properties Sheet for the virtual server There are three possible authentication methods:
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Anonymous access All incoming connections are accepted as authenticated; that is, no authentication of connections occurs Only SMTP virtual servers support this form of authentication and it is enabled by default Basic authentication Connections are authenticated by using a username and password that are passed across the connection in clear text and therefore not secure Virtual servers for three protocols (SMTP, POP3, and IMAP4) support this form of authentication and it is enabled by default SMTP takes it a step further by allowing basic authentication sessions to be encrypted using TLS encryption, a variant of SSL Integrated Windows authentication The logon credentials of the currently logged-on user are used for authentication purposes, and the credentials are hashed during transmission to ensure their security Virtual servers for these three protocols support this form of authentication and it is enabled by default
You might consider disabling basic authentication to ensure greater security by forcing integrated Windows authentication to authenticate incoming connections, but this might not work because integrated Windows authentication normally doesn t work through a corporate firewall if it proxies connection requests Furthermore, for Exchange servers used internally, you may want to disable anonymous access for SMTP virtual servers for greater security, but bridgehead servers connected to the Internet most likely require that anonymous access be enabled for SMTP to allow the servers to communicate with other SMTP hosts on the Internet
Secure communication This method allows you to configure secure communications for your virtual server using X509 certificates on the Certificate and Communication buttons on the Access tab This subject is beyond the scope of this book Connection control This method allows you to grant or deny access to the virtual server for individual IP addresses, subnets of IP addresses, or DNS domain names To access this setting, open the Properties Sheet for the virtual server, switch to the Access tab, and click the Connection button to open the Connection dialog box (Figure 235) You can grant access to all clients except those with specific IP or DNS restrictions or deny access to all clients and allow access on a case-by-case basis By default, all IP addresses and domains are allowed access to the virtual server
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