I have a CentOS system that I can connect to using several SSH clients (FireSSH, WinSCP, MySQL Workbench over SSH). For some reason, PuTTY, which was working a few days ago, can not connect. It will ask for a user name, then it sits until the server drops the connection. It never even asks for a password.

Any ideas on what could be wrong? There have been no changes to the server in that time, and since I can connect with other clients, I don't think it's a firewall issue.

Event Log: =~=~=~=~=~=~=~=~=~=~=~= PuTTY log 2015.06.23 18:08:45 =~=~=~=~=~=~=~=~=~=~=~= Event Log: Writing new session log (SSH packets mode) to file: putty.log Event Log: Looking up host "x.x.x.x" Event Log: Connecting to x.x.x.x port 22 Event Log: Server version: SSH-2.0-OpenSSH_4.3 Event Log: Using SSH protocol version 2 Event Log: We claim version: SSH-2.0-PuTTY_Release_0.63 Event Log: Doing Diffie-Hellman group exchange Event Log: Doing Diffie-Hellman key exchange with hash SHA-1 Event Log: Host key fingerprint is: Event Log: ssh-rsa 2048 xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx Event Log: Initialised AES-256 SDCTR client->server encryption Event Log: Initialised HMAC-SHA1 client->server MAC algorithm Event Log: Initialised AES-256 SDCTR server->client encryption Event Log: Initialised HMAC-SHA1 server->client MAC algorithm Event Log: Using SSPI from SECUR32.DLL Event Log: Attempting GSSAPI authentication Event Log: Server unexpectedly closed network connection

  • Can you share the putty event log? – Jeff Schaller Jun 23 '15 at 21:47
  • Not much to show :=~=~=~=~=~=~=~=~=~=~=~= PuTTY log 2015.06.23 17:57:09 =~=~=~=~=~=~=~=~=~=~=~= login as: root – user120675 Jun 23 '15 at 22:00
  • Indeed -- try increasing the putty logging level and try again. – Jeff Schaller Jun 23 '15 at 22:06
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    Please remember to edit your question and include the additional information there. It can get lost all too easily in the comments. – roaima Jun 23 '15 at 22:14
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    Are the other clients using GSSAPI? if not, you may want to try disabling it – steeldriver Jun 23 '15 at 22:35

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