HP UX SNAplus2 manual Support TN3270E, TCP/IP port number

Configuring Passthrough Services

Configuring TN Server

Permit access from a specific TCP/IP address. If you know the TCP/IP address of the TN3270 client, select this option and enter the address in the standard TCP/IP dotted decimal address format.

Support TN3270E

The level of TN3270 support provided by the node:

TN3270

Support only the TN3270 protocol. Selecting this option disables server support for TN3270E protocols, even if they are supported on the client.

TN3270E

Support both TN3270 and TN3270E protocols (the default).

TN3270 and TN3287 protocols are always supported, regardless of which option you choose.

TCP/IP port number

The TCP/IP port number (on the TN server) for the port to which the TN3270 client connects.

NOTE TCP/IP ports are completely unrelated to SNA ports.

The well-known port number for the TN3270 service is 23, but use of this port number is likely to clash with the HP-UX system TELNET service. SNAplus2 includes a utility to enable this port to be shared between the telnet and TN3270 daemons; that utility must be installed for both to work. For details about this utility, refer to the information for the define_tn3270_access command in HP-UX SNAplus2 Administration Command Reference.

If you choose a different port number that is not in use on the TN server, you also need to configure that port number on the TN3270 clients (or start the TN3270 clients using an option to specify the port number). Port numbers above 2000 are likely to be available. Port numbers in the range 256–1023may give slightly better security, but are more likely to be in use.

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