Rob Schramm of the IBM Mainframe Discussion List <[email protected]>
wrote on 08/09/2007 07:47:35 AM:

> I am assuming that you know that port 23 is typically used for
> non-encrypted TN3270 traffic.
>
> 992 is the SSL port for TN3270.
>
> from the port-numbers
>
> http://www.iana.org/assignments/port-numbers
>
> telnet           23/tcp    Telnet
> telnet           23/udp    Telnet
> telnets      992/tcp    telnet protocol over TLS/SSL
> telnets      992/udp    telnet protocol over TLS/SSL
>

Yes, I was aware of that assignment.  When I tried to telnet using port 992
I could not connect.  I then tried port 23 and I could connect.

Regards,
John K

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