Dear Team,

I am having around 250 Cisco 4507 Devices. I am unable to login using NCM to the devices, where as i could login using Putty. ALso i have did a session trace. The output is as below:

[17298157] [09/09/2019 09:48:53.104] -----------------Net. SWTelnet v7.10.0.166-------------------

[17298157] [09/09/2019 09:48:53.120] UseCustomMorePromptBehaviour: False

[17298157] [09/09/2019 09:48:53.135] MorePromptKey:

[17298157] [09/09/2019 09:48:53.135] Custom MorePrompt Pattern:

[17298157] [09/09/2019 09:48:53.151] Login Attempts: 1

[17298157] [09/09/2019 09:48:53.167] Enable Identifier: #$

[17298157] [09/09/2019 09:48:53.182] Device Template: Cisco IOS Connection Profile: AUH

[17298157] [09/09/2019 09:48:53.182] UseExactPromptMatch=False

[17298157] [09/09/2019 09:48:53.198] Menu-based mode=False

[17298157] [09/09/2019 09:48:53.213] FreezeLoginForPreCommands mode= False

[17298157] [09/09/2019 09:48:53.213] CommandCharKey = Default

[17298157] [09/09/2019 09:48:53.229] FISP mode= False

[17298157] [09/09/2019 09:48:53.229] EncryptionAlgorithm= Auto

[17298157] [09/09/2019 09:48:53.229] WODSSH Version: 2.7.2.180

[17298157] [09/09/2019 09:48:53.245] UseVirtualPromptForCommands False

[17298157] [09/09/2019 09:48:53.245] Responce Timeout in seconds: 15

[17298157] [09/09/2019 09:48:53.260] Connection Timeout in seconds: 45

[17298157] [09/09/2019 09:48:53.260] StateChange: Connecting

[17298157] [09/09/2019 09:48:53.510] Got HostFingerPrint: System.Byte[]

[17298157] [09/09/2019 09:48:53.573] SWTelnet9 Crypto Information Begin

[17298157] [09/09/2019 09:48:53.573] Protocol = SSH2

[17298157] [09/09/2019 09:48:53.588] RemoteName = 10.107.158.1

[17298157] [09/09/2019 09:48:53.604] SCcipher = aes128-cbc

[17298157] [09/09/2019 09:48:53.604] CSCipher = aes128-cbc

[17298157] [09/09/2019 09:48:53.620] Keys = ssh-rsa

[17298157] [09/09/2019 09:48:53.635] SWTelnet9 Crypto Information End

[17298157] [09/09/2019 09:48:55.292] TimerTick: mstrData=<> State=Connecting

[17298157] [09/09/2019 09:48:55.292] Pending Disconnect = False

[17298157] [09/09/2019 09:48:55.307] TimerTick: not idle, leaving

[17298157] [09/09/2019 09:48:56.198] Got Login Challenge: Password:

[17298157] [09/09/2019 09:48:56.198] Keyboard Interactive Authentication not set. Stop processing login challenge

[17298157] [09/09/2019 09:48:57.323] TimerTick: mstrData=<> State=Connecting

[17298157] [09/09/2019 09:48:57.323] Pending Disconnect = False

[17298157] [09/09/2019 09:48:57.338] TimerTick: not idle, leaving

[17298157] [09/09/2019 09:48:58.260] StateChange: Disconnected

[17298157] [09/09/2019 09:48:58.260] TimerTick: Killing session timer.

[17298157] [09/09/2019 09:48:58.276] Connection Error : WeOnlyDo.Exceptions.SSH.AuthorizationException: Authentication with the server failed.

at A.B.E(Int32 )

at A.B.d(Int32 )

at A.B.A(IAsyncResult , Int32 )

[17298157] [09/09/2019 09:48:58.292] TimerTick: Killing session timer

The Model details are as below:

Cisco IOS Software, Catalyst 4500 L3 Switch Software (cat4500e-I​PBASEK9-M), Version 12.2(53)SG​4, RELEASE SOFTWARE (fc2) Technical Support: www.c​isco.com/t​echsupport Copyright (c) 1986-2011 by Cisco Systems, Inc. Compiled Fri 25-Feb-11 15:22 .

Any body has any such experiences. One Doubt i am feeling is that Node is having an SSH Authenticaltion with Diffie Helman Group 1 SHA Authentication. Will it be an issue. What is the work around.

Best Regards,

Geo John