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Understanding the portmapper service

A portmapper is a service that runs independently of the Remedy AR System server and serves as a directory of port numbers.

Depending on whether or not the server is registered with a portmapper, users must perform the following actions while logging on to Remedy AR System:

  • If a server is registered with a portmapper, users do not need to specify the port number in the client, because the portmapper can locate the port and direct clients to the appropriate location.
  • If a server is not registered with a portmapper, or if a Port 111 firewall blocks the portmapper port, users must specify the port.

When you start the server, it opens a port to listen to. You can specify a port for the server or let the server obtain an available port dynamically.

You can register a server with a portmapper and assign a port number. For example, if you do this and do not expose the portmapper outside a firewall, clients within the firewall do not need to be configured to access the specified port number. They can access the portmapper, which directs them to the port. Clients outside the firewall must be configured to access the specified port number.

Note

The Remedy AR System server does not have a default port or specific range of ports. The operating system randomly assigns ports. To ensure that the portmapper always uses the same port for the Remedy AR System server, specify a port during installation or use the Remedy AR System Administration Console to configure the server after you install it.

Portmapper detection

On Windows, the AR System installer searches for an existing portmapper. If a portmapper is installed and running and you choose to register with a portmapper, the Remedy AR System registers the server with that portmapper. If the installer does not detect a running portmapper and you chose to register with a portmapper, the installer installs the portmapper and registers the AR System server with that portmapper.

Port number assignment

If you do not register with a portmapper, you must assign a port number to any AR System server that you want clients to access directly, and to the plug-in server.

Note

Do not assign port numbers that conflict with port numbers used by other applications or other programs running on your system. To find out which port numbers are already in use, use the netstat -na command (UNIX) or the netstat -a command (Windows) at the command prompt.

Assign port numbers greater than 1024, because:

  • Port numbers within the range 1 – 1024 are available for use only by the superuser, and many of these numbers are reserved.
  • Remedy AR System clients earlier than version 5.0 cannot access port numbers lower than 1024.

Important

  • When installing on Linux, the installation program crashes if you enter port 12333 for any port parameter, such as the Java Plug-in Server TCP Port Number or the AR System Server TCP Port Number. This a known JVM issue in version Java 2 Runtime Environment, Standard Edition 8 update 45.
  • You can also add the ports to the TCD-Specific-Port and Plugin-Port parameters by using the Remedy AR System Administration Console.

For more information about port numbers, go to http://www.iana.org/assignments/port-numbers.

Connecting to AR System at a specific TCP port

When using an API client on a Linux server, you can connect to the AR System at a specific TCP port by setting the AR TCP Port variable.

The following strategies require that all servers that the client uses be on the same port.

For the C shell, use the following commands to set ARTCPPORT:

setenv ARTCPPORT <TCPPortNumber> aruser &

For the Bourne shell, use the following commands to set ARTCPPORT:

ARTCPPORT=<TCPPortNumber>; export <ARTCPPORT> aruser & 

For an Developing an API program, you can set variables through a shell or from within the program.

 

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