Connectrix MDS 'Telnet' Service Stops Responding Leading to a Core File

Summary: Connectrix MDS 'Telnet' service crash leading to the switch generating a core file for Process-name 'in.dcos-telnetd'

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Symptoms

The user receives the following message indicating a process was unresponsive and a 'core' file is saved. However, there is no impact seen on the switch.  
in.dcos-telnetd(non-sysmgr) crashed, core will be saved
The following message is seen in the switch show.logging log. 
2024 Mar 15 09:51:05 ffsanedge07 %SYSMGR-2-LAST_CORE_BASIC_TRACE: : PID 15280 with message in.dcos-telnetd(non-sysmgr) crashed, core will be saved
The following are the 'core' files created every time the process 'telnetd' crashes. 
`show cores`
Module  Instance  Process-name     PID       Date(Year-Month-Day Time)
------  --------  ---------------  --------  -------------------------
6       1         in.dcos-telnetd  14478     2023-11-03 04:11:04
6       1         in.dcos-telnetd  10597     2023-11-08 09:31:27
6       1         in.dcos-telnetd  21698     2023-11-10 09:35:25
6       1         in.dcos-telnetd  20368     2023-11-13 09:12:53
6       1         in.dcos-telnetd  31336     2023-11-17 08:59:56
6       1         in.dcos-telnetd  22098     2023-11-20 08:55:27
6       1         in.dcos-telnetd  25933     2023-11-22 08:38:29
6       1         in.dcos-telnetd  3189      2023-11-24 10:00:28
6       1         in.dcos-telnetd  25948     2023-11-27 09:55:52
6       1         in.dcos-telnetd  1850      2023-12-01 10:03:35
6       1         in.dcos-telnetd  28201     2023-12-06 09:41:55
6       1         in.dcos-telnetd  30095     2023-12-08 09:04:03
6       1         in.dcos-telnetd  22209     2023-12-11 09:20:24
6       1         in.dcos-telnetd  24280     2023-12-18 09:26:36
6       1         in.dcos-telnetd  1661      2023-12-22 09:31:20
6       1         in.dcos-telnetd  7387      2023-12-29 09:46:17
6       1         in.dcos-telnetd  4302      2024-01-03 09:57:42
6       1         in.dcos-telnetd  7314      2024-01-10 10:19:02
6       1         in.dcos-telnetd  9684      2024-01-12 09:31:55
6       1         in.dcos-telnetd  686       2024-01-15 09:30:23
6       1         in.dcos-telnetd  6969      2024-01-17 09:58:26
6       1         in.dcos-telnetd  10804     2024-01-19 08:59:09
6       1         in.dcos-telnetd  3765      2024-01-22 09:06:36
6       1         in.dcos-telnetd  9696      2024-01-31 08:34:45

Cause

This issue is observed when a Telnet connection is initiated to the switch by Tenable Nessus for Security.

Confirm that the Telnet feature is enabled by running the below command: 
`show feature` [vdc 1]
Feature Name         Instance State
-------------------- -------- -----
telnetServer         1        enabled

Resolution

Workaround:
Disable Telnet and use SSH instead.

Affected Products

Connectrix MDS-9710, Connectrix MDS-9710-V2
Article Properties
Article Number: 000223523
Article Type: Solution
Last Modified: 27 Mar 2024
Version:  1
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