Telnet on iSeries

pts.
Tags:
AS/400
i5
iSeries
OS/400
PC/Windows Connectivity
Is it possible to have multiple telnet ports listening at the same time for telnet connections on the iSeries? (i.e., the normal port 23, plus one or two additional ports to split traffic, etc.). If so, do you have to configure / start multiple telnet servers on the iSeries (one for each specified port)?

Answer Wiki

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The Telnet server by using the STRTCPSVR SERVER(*TELNET) command, and each time you run the command it will start an additional Telnet server on the AS/400.

You cannot specify a port number when you start the server and I believe they all listen on the same port (23). The benefit of having multiple telnet servers is the reduced chance of having a connection attempt refused.

If you are able to run the STRTCPSVR SERVER(*TELNET) command, do so and then use the NETSTAT followed by option 3 to see a list of TCP/IP jobs/statuses. At the top of the list you should see one or more entries with “Telnet” in the “Local Port” column and a “State” of “Listen”.

Hope this helps a little

All the best

Jonathan
www.astradyne-uk.com

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No.

At least, not with the default processes. Running STRTCPSVR *TELNET when the telnet server is already running will have no effect. You can have two telnet servers running on two different ports if you have both SSL and non-SSL connections allowed, but otherwise it’s one or the other. And they listen on the appropriate ports for the services.

So far, I’ve never seen a case where the server couldn’t handle the traffic. Telnet simply isn’t particularly verbose in terms of modern adapter speeds.

Tom

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