telnet into PiDP-10

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Teri Bertram

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Apr 24, 2024, 11:58:49 AM4/24/24
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A bit of a mystery: I have no trouble telnetting into TOPS-10, TOPS-20, or ITS using "telnet localhost n", but when I try to telnet from a  laptop connected to the same network I always get a "permission denied: telnet" error. At first I thought I didn't set my pi up correctly, so I double-checked that SSH was enabled (I didn't see an option for enabling remote TELNET). After reading Oscars preliminary PiDP-10 Manual (THANK YOU OSCAR!) I expected I could follow his example to get it to work while the PiDP-10 was running ITS, but I still get the same error. I even specified the actual IP address used by the PiDP-10's pi, but no dice:

teri1337@Thumper ~ % telnet 10.0.1.118 10018

zsh: permission denied: telnet

teri1337@Thumper ~ % telnet pidp10 10018           

zsh: permission denied: telnet


Note that pinging the pidp-10 works fine:

teri1337@Thumper ~ % ping 10.0.1.118

PING 10.0.1.118 (10.0.1.118): 56 data bytes

64 bytes from 10.0.1.118: icmp_seq=0 ttl=64 time=21.023 ms

64 bytes from 10.0.1.118: icmp_seq=1 ttl=64 time=10.892 ms

64 bytes from 10.0.1.118: icmp_seq=2 ttl=64 time=8.955 ms


I *can* SSH into the  PiDP-10 using the user/password then do a "telnet localhost" from there, but that seems rather clunky and I'd much prefer to do a direct telnet into a DEC terminal window.

The PiDP-10 is running on a pi-5 and when I installed the pi-OS I created a user named "user" with a corresponding password (since I did not see an option to create a user without a password). Could that be the problem? Any insights would be greatly appreciated! THANKS! :-)


Gary Grebus

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Apr 24, 2024, 12:46:20 PM4/24/24
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Can you "telnet localhost" on the laptop?  (maybe not, it probably has no telnet server running)   But that looks like "permission denied" running the telnet program.   Maybe a file protection problem?

Teri Bertram

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Apr 24, 2024, 1:32:07 PM4/24/24
to PiDP-10
Nevermind... I went to a different computer on my network and the telnet worked just fine. The problem was with my laptop! I can't believe I spent a couple weeks on this. LOL
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