Super User Asked by oarfish on January 19, 2021
I use a Google Cloud VM and every once in a while I switch back to my terminal and see my ssh session has frozen. When I then try to reconnect
ssh -v -i ~/.ssh/key [email protected]
It shows this:
OpenSSH_7.4p1, LibreSSL 2.5.0
debug1: Reading configuration data /Users/UserName/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 53: Applying options for *
debug1: Connecting to host.domain [123.456.123.456] port 22.
debug1: Connection established.
debug1: identity file /Users/UserName/.ssh/ke> type 1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/UserName/.ssh/key-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.4
So it appears a connection is established, but nothing else happens and I need to restart the VM. What does this mean?
I should note that I can ping
the host with no problem, so it’s not frozen or anything.
debug1: Local version string SSH-2.0-OpenSSH_7.4
When a client connects to an SSH server, the server starts the SSH protocol by sending a server version string in plain text to the client. With the OpenSSH ssh
utility, the relevant debug lines look like this:
debug1: Local version string SSH-2.0-OpenSSH_7.6
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.6
After the "local version" line, your client is waiting for the server to send its version string to the client. If the connection hangs here, it's because the client hasn't received the version string from the server.
In general there are several things that could cause this:
In your case, you're connecting to port 22 so it's safe to assume you're connecting to an SSH server process. It seems likely you're suffering from #2 (the server is malfunctioning), but it's not possible to say exactly what is wrong beyond that. You would need to get into the server and figure out what was happening at the time which prevented it from processing SSH connections.
Correct answer by Kenster on January 19, 2021
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