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How to control the ports range that is allocated for the connection between the forms servlet listener and the Forms runtime process (Doc ID 461587.1)

Last updated on MAY 08, 2020

Applies to:

Oracle Forms - Version 10.1.2.0.2 and later
Information in this document applies to any platform.

ATTENTION
The Notes describe changes in operating system parameters that may causes serious problems if it is not implemented correctly.



Goal

ATTENTION
The Notes describe changes in operating system parameters that may causes serious problems if it is not implemented correctly.

Forms listener servlet uses a predefined range of ports to communicate with forms runtime process. This range of ports is controlled by the operating system.
In other words, Forms waits for the operating system to allocate a free temporary port for talking to the Forms runtime process.
There used to be a range specification in the Forms Listener, but in new version of forms services, this has been taken away for the servlet and is now dependent on the OS to give it an open port.

From Operating system point of view, this allocated temporary port is called ephemeral port, which is a TCP or UDP port number that is automatically allocated from a predefined range by the TCP/IP stack software. When the connection terminates, the ephemeral port is available for reuse, although most IP stacks won't reuse that port number until the entire pool of ephemeral ports have been used. So, if the client program reconnects, it will be assigned a different ephemeral port number for its side of the new connection.

Some operating systems, like Linux, allow changing the whole range for the ephemeral ports. Some others, like windows, allow changing the maximum value only.

By controlling the ephemeral ports range, you control the number of concurrent connections form the Forms listener servlet and the Forms runtime processes.

Solution

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In this Document
Goal
Solution
 
Linux
 Microsoft Windows

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