But if you want to minimize problems with disconnects you should really start using screen The Persistence feature described below should be particularly interesting. Unfortunatly there seems to be no easy way to fix that, this is all I found on it: Putty FAQ Now the session is kept up indefinitely.The freezing might be a timeout problem. (For debugging and tracing, I changed sshd settings toĪfter that, I tried to change the server settings toĪnd check WinSCP's "Sending of null packets to keep session alive" and set "Minutes between keepalives" to 1 (winscp_longerServerTimeout.cap). Siffer traces and what the dialog box looks like can be found here for at least a week or two: If this doesn’t work, try another method below. When you encounter the PuTTY Network error: Connection timed out, you should first connect to your system administrator because they may make changes to permission for security reasons. I've also tried with OpenSSH's ssh client and that works fine too. Contact The System/Network Administrator. I also tried the "Use scp2 with scp1 compat." setting and that had the same behavior. (Just an ACK?) after 6 minutes, the server sends a packet with the FIN set and then the first time I try to do anything with the GUI, I get the quoted error message above.įor both WinSCP and Putty, I start with a new session enter host and username, and only change the SSH version to "2 only". WinSCP, on the other hand, reponds to the servers packet with a 60 byte packet with no data. (Just an ACK?) Putty keeps the connection open indefinitely. Putty responds shortly after with a 90 byte packet (containing 36 bytes of data) and the server responds shortly after that with a 60 byte packet. The server sends a 122 byte TCP packet from port 22 to the client port. But this afternoon, while running my PuTTY again, it isnt able to reach the VM and throw me a 'timed out' connection after some time. I've looked with SnifferPRO and with Ethereal, and of course it isn't possible to decode SSH, but the following happens every 60 seconds: Once connected ive managed the VM, created the authorizedkeys file and copied my public key in it under the.
![ssh session timeout putty ssh session timeout putty](https://www.kadekjayak.web.id/wp-content/uploads/2018/11/Putty-Session.jpg)
change directory, I get this error message: After 6 minutes, if I try to do anything, e.g. If you want to set the keep alive for the server, add this to /etc/ssh/sshdconfig: ClientAliveInterval 60. Now the server sends a keepalive every 60 secs, and the client is supposed to respond. The NAT in the firewall (that I can't change) kills TCP sockets if they aren't used, so this had been set in OpenSSH's sshd_config (on a server outside the firewall): Für Linux-Hosting-Pakete und Managed Dedicated Server. I'm connecting through NAT and a firewall. Putty, which WinSCP is based on, reponds correctly to the server's keepalive packets, it seems. A PuTTY Security Alert opens up to confirm the ssh-server-key-fingerprint, Click on Accept / Connect Once. Of course that requires root access on the remote server. In the Host Name (or IP address) section, enter localhost or 127.0.0.1 Port-22 Click on Open. The workaround was to change the server configuration to ClientAliveInterval 120 so that WinSCP's null-packet timeout got there in time, so the server's timeout mechanism is never used. And WinSCP didn't respond to the servers keepalive packet properly, it seems, so the server terminated the connection (after 6 minutes of inactivity, in my case). In C:Usersyourusername.ssh make a new file named config, and add the lines below: You can solve this on the client side by setting the options ServerAliveInterval and ServerAliveCountMax (60 and 30 will send a keep-alive packet every minute and still keep the connection if your network falls for up to 30 minutes). When you connect to a server for the first time, you are likely to see a PuTTY Security Alert dialog about the servers host key not being cached in the registry.
![ssh session timeout putty ssh session timeout putty](https://i.stack.imgur.com/dGclE.png)
I had an OpenSSHv2 server set up with ClientAliveInterval 60, which was just short enough that it required WinSCP to answer because the server's 60 second keepalive got triggered just before WinSCP's minimum keepalive of 1 minute. It seems WinSCP does not respond to OpenSSHv2 server's keepalives.