Server unexpectedly closed network connection

[jeffl012]

I'm running putty from a Win 7 client and receiving a "Server unexpectedly closed network connection" message immediately after logging in. I turned off the firewall, but that did not help. Any suggestions?

[To-M]

Does this happen to all clients running Putty? See if you can test with another client and if it is happening the same then could be something happening to the system. You might want to look at the critical error logs to see if there are any alerts.

[jeffl012]

Unfortunately, I can't try connecting from more than one system. I'm using Logmein to connect to a Win 7 system on a yacht, then I use that systems browser to connect to the NAS-R3.

[To-M]

Did you set the VT100+ for Putty and can you get the log file from the GUI and look at the critical error log.

[jeffl012]

Yes, "" is selected. Below are the logs


2011-09-07 16:22:10 Writing new session log (SSH raw data mode) to file: putty.log
2011-09-07 16:22:10 Looking up host "192.168.1.131"
2011-09-07 16:22:10 Connecting to 192.168.1.131 port 22222
2011-09-07 16:22:10 Server version: SSH-2.0-OpenSSH_5.0
2011-09-07 16:22:10 Using SSH protocol version 2
2011-09-07 16:22:10 We claim version: SSH-2.0-PuTTY_Release_0.61
2011-09-07 16:22:10 Doing Diffie-Hellman group exchange
2011-09-07 16:22:10 Doing Diffie-Hellman key exchange with hash SHA-256
2011-09-07 16:22:11 Host key fingerprint is:
2011-09-07 16:22:11 ssh-rsa 1024 e6:ca:0e:b8:7f:3a:e6:de:32:7a:bc:fe:98:e3:e0:f4
2011-09-07 16:22:11 Initialised AES-256 SDCTR client->server encryption
2011-09-07 16:22:11 Initialised HMAC-SHA1 client->server MAC algorithm
2011-09-07 16:22:11 Initialised AES-256 SDCTR server->client encryption
2011-09-07 16:22:11 Initialised HMAC-SHA1 server->client MAC algorithm
2011-09-07 16:22:11 Keyboard-interactive authentication refused
2011-09-07 16:22:17 Sent password
2011-09-07 16:22:17 Access granted
2011-09-07 16:22:17 Opened channel for session
2011-09-07 16:22:17 Allocated pty (ospeed 38400bps, ispeed 38400bps)
2011-09-07 16:22:17 Started a shell/command
2011-09-07 16:22:19 Server unexpectedly closed network connection

[jeffl012]

I saw able to run putty from another Windows 7 computer. The same result occured. Nay suggestions?

[Gr-R]

make sure latest release of DSS, Im assuming you already have done this.
maybe this can help:
http://kb.open-e.com/How-do-I-connec...motely_97.html

[jeffl012]

This is an OEM release of DSS it cant be upgraded. We have no control over what the customer does. What would cause Putty to disconnect after a successful login? We have several other setups that are the same and this problem does not occur.

[Gr-R]

likely a network connection error after validation.

You can try another SSh client to check is its even a putty problem. But normally this is due to connection issues and firewalls, and / or routers.

Can you tell us the version of DSS being used?

[jeffl012]

It's ver: 5.0.DB47000000.3200
Thanks.