I don't know if port restrictions will do it or not? But generally it should cause problems. In the next response however, you say it's the destination port. That is very much controlled by the telnet command.
On Tue, 2021-11-23 at 19:50 +0000, Greg Wilburn wrote:
Ok... any way to CHGTCP to avoid using that port?
-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx<mailto:midrange-l-bounces@xxxxxxxxxxxxxxxxxx>> On Behalf Of Kevin Bucknum
Sent: Tuesday, November 23, 2021 2:10 PM
To: hs@xxxxxxx<mailto:hs@xxxxxxx>; midrange-l@xxxxxxxxxxxxxxxxxx<mailto:midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: Re: Port 3389 (RDP)
3rd that. Outgoing telnet should be selecting a random port greater than 1023. 3389 is valid.
On Tue, 2021-11-23 at 14:05 -0500, Larry "DrFranken" Bolhuis wrote:
Kazaa!
Totally agree. 3389 is not a well known port and is completely valid for
a source port number.
On 11/23/2021 1:37 PM, Holger Scherer wrote:
was 3389 the source port? Then get rid of that "security software"…
-h
------ Originalnachricht ------
Von: "Greg Wilburn" <gwilburn@xxxxxxxxxxxxxxxxxxxxxxx<mailto:gwilburn@xxxxxxxxxxxxxxxxxxxxxxx><mailto:gwilburn@xxxxxxxxxxxxxxxxxxxxxxx<mailto:gwilburn@xxxxxxxxxxxxxxxxxxxxxxx>>>
An: "Midrange Systems Technical Discussion" <midrange-l@xxxxxxxxxxxxxxxxxx<mailto:midrange-l@xxxxxxxxxxxxxxxxxx><mailto:midrange-l@xxxxxxxxxxxxxxxxxx<mailto:midrange-l@xxxxxxxxxxxxxxxxxx>>>
Gesendet: 23.11.2021 19:29:35
Betreff: Port 3389 (RDP)
Anyone know why a Power 9 system running v7r3 would use TCP port 3389
to contact a telnet device (Motorola/Zebra Radio Frequency device
running 5250 telnet)?
This occurred yesterday and the security software on our firewall shut
down access from that network to the IBM system.
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