Target Skills:

Ability to set up Client Access Controls.

 
 
 

More Info:

Configuring Client Access to TCP Services (Admin Guide)

Controlling Client Access

One important security setting is how to control client access to the various messaging services on the server.  Netscape Messaging Server controls client access through a process commonly called "TCP Wrappers", which are filters that run at the TCP/IP level for each service (SMTP, IMAP4, and POP3).
 

Allow and Deny Filters

For each service, separate sets of Allow filters and Deny filters control access. Allow filters explicitly grant access; Deny filters explicitly forbid access.

The very simplest form of a filter is

service: hostSpec
where service is the name of the service (such as smtp, pop, or imap) and hostSpec is the host name, IP address, or wildcard name or pattern that represents the client requesting access. Here are two examples:
imap: roberts.newyork.airius.com
pop: ALL
If these are Allow filters, the first one grants the host roberts.newyork.airius.com access to the IMAP service, and the second one grants all clients access to the POP service. If they are Deny filters, they deny those clients access to those services. 

You will try these filters out in the exercise on the following pages.
 


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