why the linux sshd refused the connection from putty while dos cmd accepted?

EisenWang

7/24/23, 3:59 AM

I installed a SLES12 VM, usually I used putty to ssh to it to run my test from my windows. This morning, I found putty fail to ssh to this VM with this error --

2022-03-24T09:13:58.888898+08:00 sles12 sshd[2588]: Accepted keyboard-interactive/pam for root from 192.168.160.1 port 60620 ssh2
2022-03-24T09:13:58.889801+08:00 sles12 sshd[2588]: pam_unix(sshd:session): session opened for user root by (uid=0)
2022-03-24T09:13:58.891378+08:00 sles12 systemd-logind[1221]: New session 9 of user root.
2022-03-24T09:13:58.902088+08:00 sles12 systemd[1]: Started Session 9 of user root.
**2022-03-24T09:13:58.903541+08:00 sles12 sshd[2588]: error: connect_to 0 port 52096: failed.**
2022-03-24T09:13:59.502000+08:00 sles12 sshd[2588]: pam_unix(sshd:session): session closed for user root
2022-03-24T09:13:59.509209+08:00 sles12 systemd-logind[1221]: Removed session 9.

I never changed the default sshd settings on my SLES12 VM, yet keep all default settings on putty. Then I tried with win10's shell cmd -- then to my big surprise -- it works fine, when I type --

ssh [email protected]

It succeeds with these messages on /var/log/messages --

2022-03-24T09:13:38.232538+08:00 sles12 sshd[2539]: Accepted keyboard-interactive/pam for root from 192.168.160.1 port 60613 ssh2
2022-03-24T09:13:38.233184+08:00 sles12 sshd[2539]: pam_unix(sshd:session): session opened for user root by (uid=0)
2022-03-24T09:13:38.235368+08:00 sles12 systemd-logind[1221]: New session 8 of user root.
2022-03-24T09:13:38.251185+08:00 sles12 systemd[1]: Started Session 8 of user root.

That "sshd[2588]: error: connect_to 0 port 52096: failed" has gone... But when I back to putty -- it failes again with same error message. And it's not the firewall issue as I turned off the iptables on my SLES12 VM, and connect to it from the same host -- that win10. I searched but found nothing valuable. Please kind advise. Thanks

Regards Eisen

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ssh

sles

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: why the linux sshd refused the connection from putty while dos cmd accepted?

TH: ทำไม linux sshd ปฏิเสธการเชื่อมต่อจาก putty ในขณะที่ dos cmd ยอมรับ

RO: de ce linux sshd a refuzat conexiunea de la putty în timp ce dos cmd a acceptat?

RU: почему linux sshd отказался от соединения с putty, а dos cmd принял?

VI: tại sao sshd linux từ chối kết nối từ putty trong khi dos cmd được chấp nhận?

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