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About Network Ports

A network "port" may sound like a physical connection of some kind, like the USB ports on the back (or front or side) of your computer. In network terminology, though, a port is most often a logical or virtual concept, part of a network transport protocol (TCP/IP, for example, or UDP). In this sense, a port is a logical destination on a specific host that is identified with some particular service or listener. Port 21, for example, is often used for FTP servers.

Ports are most often significant to FileMaker administrators who administer or otherwise encounter firewalls. Many firewalls do port-based blocking or filtering of traffic. If traffic to or from a particular port is not permitted across a firewall, services may be disrupted or blocked. For example, if port 21 is blocked on a firewall, an FTP server behind that firewall will be unreachable. If port 5003 is blocked on a firewall, a FileMaker server behind the firewall will be unreachable.

For an extensive listing of port numbers, see the list maintained by IANA at http://www.iana.org/assignments/port-numbers. Some of the FileMaker network ports are registered whereas others are not, though this has little practical significance for FileMaker administrators.



: FileMaker Specifications

FileMaker 8 Product Line

Specifications and Storage Limits

Field Types and Import/Export Formats

: Calculation Functions

Working with Calculations Primer

Calculation Signatures

Calculation Functions

: Custom Functions

Custom Functions Primer

Useful Custom Functions

: Script Steps

Scripting Primer

Script Step Reference

: Quick Reference

FileMaker Error Codes

FileMaker Keyboard Shortcuts

FileMaker Network Ports

FileMaker Server Command Line Reference

FileMaker XML Reference

: Other Resources

Where to Go for More Information

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FileMaker 8 Functions and Scripts Desk Reference
FileMaker 8 Functions and Scripts Desk Reference
ISBN: 0789735113
EAN: 2147483647
Year: 2004
Pages: 352
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