Unable to Login to ASA via Putty - Network Error: Software caused connection abort

ShineSudheesh — Tue, 23 Jun 2020 08:11:40 GMT

Dear All,

We have Problem in SSH accessing the ASA via Putty.

++Login Prompt is coming ,when trying to access the ASA via Putty

++After Put username and Password, connection aborted and below error is showing on Putty.

++Tried with Different putty version and Secure CRT , but still same issue.

Network Error: Software caused connection abort

++On the same time we have run the ssh debug and could see that the authentication is successful.

ASA logging during the time of issue:

SSH2 0: authentication successful for #####
Jun 22 2020 18:59:36: %ASA-6-611101: User authentication succeeded: IP address: x.x.x.x, Uname: ####
Jun 22 2020 18:59:36: %ASA-6-611101: User authentication succeeded: IP address: x.x.x.x, Uname: ###
Jun 22 2020 18:59:36: %ASA-6-605005: Login permitted from x.x.x.x/56497 to Inside:x.x.x.x/ssh for user "####"

Debug:

SSH2 2: send: len 16 (includes padlen 10)
SSH2 2: done calc MAC out #6
SSH2 2: authentication successful for fwadminSSH1: TCP read failed, error code = 0x86300003 "TCP connection closed"
SSH1: receive SSH message: [no message ID: variable *data is NULL]
SSH1: Session disconnected by SSH server - error 0x03 "TCP connection closed"
SSH0: TCP read failed, error code = 0x86300003 "TCP connection closed"
SSH0: receive SSH message: [no message ID: variable *data is NULL]
SSH0: Session disconnected by SSH server - error 0x03 "TCP connection closed"
SSH2: TCP read failed, error code = 0x86300003 "TCP connection closed"
SSH2: receive SSH message: [no message ID: variable *data is NULL]

SSH2: Session disconnected by SSH server - error 0x03 "TCP connection closed"

++During the time of issue tcp on port 22 is established on the ASA (could see the established state under show asp table socket command)

Can you please let me know , what could be the reason of this issue.

Regards

Shine Sudheesh

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Unable to Login to ASA via Putty - Network Error: Software caused connection abort